| Tail Separation and Density Effects on the Underwater Trajectory of the JDAM |
Dec 2009 |
103 pages |
| Authors:
Jillene M Bushnell; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
 | The Navy is in need of an organic, inexpensive, swift method to neutralize or sweep waterborne mines. This thesis presents an alternative to current mine countermeasure technologies that fulfills this criteria?the use of the Joint Direct Attack Munition (JDAM) to clear a minefield. It updates the general, physics-based, six degrees of freedom model, STRIKE35, to predict the three-dimensional, free-fall trajectory and orientation of a MK-84 bomb (simulating the JDAM) through ... |
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| Atlas of Deep Current Observations for Central California |
Dec 2009 |
293 pages |
| Authors:
Ulysses D Zamora; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| Deep (1000 m) currents were observed off California from August 1994 to September 2009 using current meters and RAFOS floats. Current meter data were collected at nine locations for time periods ranging from two months to 76 months. A total of 144 months of float data were collected. Analysis of current meter data included histograms, progressive vector diagrams, stick plots, kinetic energy and rotary spectra, stick plots, means and standard ... |
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| Physical, Nutrient, and Biological Measurements of Coastal Waters off Central California in June 2008 |
Dec-2008 |
55 pages |
| Authors:
Reiko Michisaki; Baldo Marinovic; Katherine Whitaker; Marguerite Blum; Thomas A Rago; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| The results of analyses of hydrographic, nutrient, and biological data collected in coastal ocean waters off Central California in June 2008 aboard the R/V Point Sur are presented in both tabular and graphical form. The cruise departed from and returned to Monterey, California. Because the cruise encountered unusually (for the time of year) heavy weather, scientific operations could only be completed along CalCOFI line 67 from Monterey to station 75, ... |
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| Physical, Nutrient, and Biological Measurements of Coastal Waters off Central California in November 2007 |
01-Jul-2008 |
79 pages |
| Authors:
Thomas A Rago; Reiko Michisaki; Baldo Marinovic; Marguerite Blum; Katherine Whitaker; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| The results of analyses of hydrographic, nutrient, and biological data collected in coastal ocean waters off Central California in November 2007 aboard the NOAA Ship David Starr Jordan are presented in both tabular and graphical form. The cruise departed from and returned to San Francisco, California. After steaming to Monterey Bay, the ship proceeding from Moss Landing, California, along CalCOFI line 67 to station 90, thence to CalCOFI line 60/station ... |
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| Characteristics of Thermal Finestructure in the Southern Yellow Sea and the East China Sea from Airborne Expendable Bathythermograph Measurements |
01-Jan-2008 |
60 pages |
| Authors:
Sunghyea Park; Peter C Chu; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| Four surveys of airborne expendable bathythermograph with horizontal spacing of about 35 km and vertical spacing of 1 m extending from the surface down to 400 m deep are used to analyze thermal finestructures and their seasonality in frontal zones of the southern Yellow Sea and the East China Sea. Finestructure characteristics are different not only among fronts but also along the same front, implying different mixing mechanisms. Summer thermocline ... |
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| Statistical Characteristics of the Global Surface Current Speeds Obtained from Satellite Altimetry and Scatterometer Data |
01-Jan-2008 |
17 pages |
| Authors:
Peter C Chu; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| Near-real time ocean surface currents derived from satellite altimeter (JASON-1, GFO, ENVISAT) and scatterometer (QSCAT) data on 1 degree 1 degree resolution for world oceans (60 degrees S to 60 degrees N) are available online as Ocean Surface Current Analyses Real Time (OSCAR) . The probability distribution function (PDF) of the current speeds (w), constructed from global OSCAR data from 1992 to 2008, satisfies the two-parameter Weibull distribution reasonably well, ... |
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| Topical and Geographical Focus of Chinese Oceanographic Research - A Study of Trends in Publication |
01-Jan-2008 |
20 pages |
| Authors:
Rongfeng Li; Peter C Chu; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| Since the economic boom started in the early 1990s, China has expanded its educational and scientific programs. Funds increase rapidly for education and scientific research. From 1993 to 2006, enrollment of full time students in universities and colleges grew from 924,000 to 5,400,000, total number of students (including part-time) increased from 5,000,000 to 25,000,000, and the percentage of the enrolled full time students in the age (18-22) group jumped from ... |
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| A Comprehensive Modeling Approach Towards Understanding and Prediction of the Alaskan Coastal System Response to Changes in an Ice-diminished Arctic |
Jan-2008 |
10 pages |
| Authors:
Wieslaw Maslowski; John J Cassano; John J Walsh; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| Our research combines state-of-the-art regional modeling of sea ice, ocean, atmosphere and ecosystem to provide a system approach to advance the knowledge and predictive capability of the diverse impacts of changing sea ice cover on the bio-physical marine environment of coastal Alaska and over the larger region of the western Arctic Ocean. The focus of this project on seasonally ice-free Alaskan coasts and shelves is in direct support of the ... |
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| Surface Wave Processes on the Continental Shelf and Beach |
Jan 2008 |
9 pages |
| Authors:
Thomas H Herbers; Tim T Janssen; Robert R Guza; W C O'Reilly; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| By combining theoretical advances with numerical models and field observations, we investigate the physical processes that affect ocean surface waves on continental shelves and beaches. The transformation of wave spectra is predicted with models that include the effects of refraction, scattering by wave-wave and wave-bottom interactions, and parameterization of bottom friction, and wave breaking. Extensive field data sets were collected in ONR experiments off North Caroline (DUCK94, SandyDuck, SHOWEX), California ... |
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| RCEX: Rip Current Experiment |
Jan 2008 |
16 pages |
| Authors:
Jamie MacMahan; Ad Reniers; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| The long-term goals are to understand surf zone processes related to rip current systems through field observations. Rip currents occur commonly on most beaches and dominate many. It is recognized that beaches with straight and parallel contours are not a stable morphologic configuration whereas more complex beaches, which support the existence of rip current morphology, are stable and more common. |
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| Severe Particulate Pollution in Lanzhou China |
2008 |
38 pages |
| Authors:
Peter C. Chu; Yuchun Chen; Shihua Lu; Zhenchao Li; Yaqiong Lu; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| Concentrations of total suspended particles (TSP) and PM(sub 10) in Lanzhou China have been kept high for the past two decades During intensive observational period from October 1999 to April 2001, the concentrations of TSP and PM(SUB 10)( are even increasing and becoming major air pollutants; the temporally total mean PM(SUB 10)( concentration is 2%56 mg m(exp -3)(exp -3) The rate of PM(SUB 10) polluted-day occurrence to is 71% in ... |
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| Thermal Fronts and Cross-Frontal Heat Flux in the Southern Yellow Sea and the East China Sea |
2008 |
|
| Authors:
Sunghyea Park; Peter C. Chu; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
 | Synoptic features in/around thermal fronts and cross-frontal heat fluxes in the southern Yellow Sea and East China Sea (YES) were examined using the data collected from four airborne expendable bathythermograph surveys with horizontal ~35 km and vertical 1 m (from the surface to 400 m deep) spacings. Since the fronts are strongly affected by YES current system, the synoptic thermal features in/around them represent the interaction of currents with surrounding ... |
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| Argo Floats Revealing Bimodality of Large-Scale Mid-Depth Circulation in the North Atlantic |
2008 |
11 pages |
| Authors:
Peter C. Chu; Leonid M. Lvanov; Oleg V. Melnichenko; Rongfeng Li; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| Analysis of Argo float trajectories at 1000 m and temperature at 950 m in the North Atlantic between November 2003 and January 2005 demonstrates the existence of two different circulation modes with fast transition between them. Each mode has a pair of cyclonic-anticyclonic gyres. The difference is the location of the cyclonic gyre. The cyclonic gyre stretches from southeast to northwest in the first mode and from the southwest to ... |
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| Marine Mammal Acoustic Monitoring and Habitat Investigation, Southern California Offshore Region |
NOV 2007 |
42 pages |
| Authors:
John Hildebrand; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| The echolocation clicks of five dolphin species found off southern California are described and the use of clicks for species classification is investigated. Spectral and temporal properties are analyzed for the echolocation clicks from short-beaked common, long-beaked common, Risso's, Pacific white-sided and bottlenose dolphins. Two of the species exhibit unique spectral peaks and notches when the complete click is analyzed. A nested ANOVA analysis indicates that spectral peaks and notches ... |
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| Physical, Nutrient, and Biological Measurements of Coastal Waters off Central California in June 2007 |
OCT 2007 |
87 pages |
| Authors:
Thomas A. Rago; Reiko Michisaki; Baldo Marinovic; Marguerite Blum; Katherine Whitaker; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| The results of analyses of hydrographic, nutrient, and biological data collected in coastal ocean waters off Central California in June 2007 aboard the NOAA Ship McArthur-II are presented in both tabular and graphical form. The cruise departed from and returned to San Francisco, California, proceeding from Point keyes, California, along CalCOFI line 60 to station 90, thence to CalCOFI line 67/station 90, and finally along CalCOFI line 67 and along ... |
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| Multifractal Thermal Characteristics of the Western Philippine Sea Upper Layer |
JUN 2007 |
12 pages |
| Authors:
Peter C. Chu; Chung-Ping Hsieh; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| Multifractal characteristics of the upper layer (above 140 m depth) thermal structure in the western Philippine Sea near Taiwan are analyzed using high-resolution, digital thermistor chain data, The power spectra at all the depths have multi- scale characteristics with the spectral exponent beta in the range of (1, 2), which indicates nonstationary with stationary increments, The graph dimension varies from higher values such as 1 71 (in sublayer:: 60 m), ... |
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| On Long Baroclinic Rossby Waves in the Tropical North Atlantic Observed From Profiling Floats |
16 MAY 2007 |
25 pages |
| Authors:
P. C. Chu; L. M. Ivanov; O. V. Melnichenko; N. C. Wells; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| Argo float data (subsurface tracks and temperature profiles collected from March 2004 through May 2005) are used to detect signatures of long Rossby waves in the velocity of the currents at 1000-m depth and temperature, between the ocean surface and 950 m, in the zonal band of 4 N 24 N in the tropical North Atlantic. Different types of long Rossby waves (with the characteristic scales between 1000 and 2500 ... |
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| RCEX: Rip Current Experiment |
Jan 2007 |
7 pages |
| Authors:
Jamie MacMahan; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| The long-term goals are to understand surf zone processes related to rip current systems through field observations. Rip currents occur commonly on most beaches and dominate many. In the past decade, it is recognized that beaches with straight and parallel contours are not a stable morphologic configuration whereas more complex beaches, which support the existence of rip current morphology, are stable and more common. The research objectives of the proposed ... |
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| On Stochastic Stability of Regional Ocean Models to Finite-Amplitude Perturbations of Initial Conditions |
2007 |
51 pages |
| Authors:
Leonid M. Ivanov; Peter C. Chu; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| We consider error propagation near an unstable equilibrium state (classified as an unstable focus) for spatially uncorrelated and correlated finite-amplitude initial perturbations using short- (up to several weeks) and intermediate (up to two months) range forecast ensembles produced by a barotropic regional ocean model. An ensemble of initial perturbations is generated by the Latin Hypercube design strategy, and its optimal size is estimated through the Kullback - Liebler distance (the ... |
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| Ocean Nowcast/Forecast Systems for Naval Undersea Capability |
2007 |
34 pages |
| Authors:
Peter C. Chu; Jr. Amezaga G. R.; Eric L. Gottshall; David S. Cwalina; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| The U.S. Navy is a major investor in ocean model development. The pay-off of such an investment is the value-added ocean nowcast/forecast systems on the naval operations and warfare effectiveness. The purpose of this paper is to investigate the value-added of the Navy s nowcast/forecast system to the naval antisubmarine warfare (ASW) and anti-surface warfare (ASUW). The nowcast/forecast versus observational fields were used by the Weapon Acoustic Preset Program (WAPP) ... |
|
| A Comprehensive Modeling Approach Towards Understanding and Prediction of the Alaskan Coastal System Response to Changes in an Ice-Diminished Arctic |
2007 |
6 pages |
| Authors:
Wieslaw Maslowski; John J. Cassano; John J. Walsh; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| The main science hypothesis to be addressed in this project can be formulated as follows. The recently observed dramatic decrease of summer sea ice cover in the western Arctic Ocean is driven by two main, primarily local factors: (1) the oceanic heat advection of summer Pacific Water via the Alaska Coastal Current and (2) the positive ice-albedo feedback. To understand physical processes and air-sea-ice interactions involved in these two driving ... |
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| Observed Statistics of Extreme Waves |
DEC 2006 |
67 pages |
| Authors:
Anne M. Laird; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| Amphibious landings and small boat operations are normally conducted only in benign wave conditions. An unexpected encounter with an isolated freak wave may damage equipment and prevent mission accomplishment. This study examines the occurrence of unusually large waves using data sets obtained with bottom mounted pressure sensors and wave buoys in the DUCK 94, SHOWEX, and SAX 04 experiments. All of the experiments include wave records from high energy events. ... |
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| Two Chemical Spill Patterns in Tidally Dominated San Diego Bay |
01-Jan-2006 |
23 pages |
| Authors:
Peter C Chu; Kleanthis Kyriakidis; Steven D Haeger; Mathew Ward; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| A coupled hydrodynamic-chemical spill model is used to investigate the chemical spill in the San Diego Bay. The hydrodynamic model shows that the San Diego Bay is tidally dominated. The chemical spill model shows the existence of two different patterns of chemical spill for pollution (methanol, benzene, liquefied ammonia, etc.) released at 0.5 m depth in the north (32 deg 43 min N, 117 deg 13.05 min W) and the ... |
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| Interannual SST Variability in the Japan/East Sea and Relationship with Environmental Variables |
01-Jan-2006 |
19 pages |
| Authors:
Sunghyea Park; Peter C Chu; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| Interannual variability of the Japan/East Sea (JES) sea surface temperature (SST) is investigated from the reconstructed NOAA/AVHRR Oceans Pathfinder best SST data (1985 - 2002) using the complex empirical function (CEOF) analysis. The iterative empirical function analysis is used for the SST data reconstruction. The first two leading CEOFs account for 86% of total variance with 66.4% for the first mode and 19.6% for the second mode. The first CEOF ... |
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| Wind and Tiadal Effects on Chemical Spill in St Andrew Bay System |
Jan-2006 |
23 pages |
| Authors:
Peter C Chu; Steven D Haeger; Mathew Ward; Patrice Pauly; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| A coupled hydrodynamic-chemical fate model is used to investigate mechanisms for chemical dispersion in the St Andrew Bay system. It is found that the time for the pollutants transporting outward the bay mainly relies on the winds and source location. If the application of the stochastic model somehow handles the wind factor, the release location must be shifted to other places in order to evaluate the relative weight of this ... |
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| USW Area Analogs |
JUN 2005 |
145 pages |
| Authors:
Keith Everett; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| The purpose of this project is to investigate the feasibility of and methodology for the development of a set of environmental analogs of operational Undersea Warfare (USW) areas within fleet training areas. It is primarily a discussion of the identification of parameters that characterize the tactical USW environment, prioritization of these parameters, identification of existing databases that contain these parameters and an outline of the processes required to extract the ... |
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| Comparison of SWATH and Monohull Vessel Motion for Regional Class Research Vessels |
MAY 2005 |
61 pages |
| Authors:
Curtis A. Collins; James R. Clynch; Thomas A. Rago; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| The attitude characteristics of two small research vessels, a 539-ton monohull (R/V Point Sur) and a 419-ton SWATH (R/V Western Flyer), are compared. The comparison is based upon 134 (61) motion measurements carried out on the R/V Point Sur (Western Flyer) in 2003 and 2004. Measurements were made using a tilt meter and a vertical gyro. When the vessels were on station, root mean square roll on the R/V Point ... |
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| The North Atlantic Oscillation Influence on the Wave Regime in Portugal: An Extreme Wave Event Analysis |
MAR 2005 |
106 pages |
| Authors:
Alvaro A. Semedo; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| Waves in the North Atlantic are strongly seasonal, and peak in the winter season. The west coast of Portugal is exposed to winter swell, generated by wind associated with North Atlantic extratropical cyclones. The track of these storms, generated near the North America east coast, is strongly influenced by the North Atlantic Oscillation (NAO). When the NAO is in its positive phase they normally track northeast and reach Western Europe ... |
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| Afforestation for Improving Valley Urban Air-Quality |
01-Jan-2005 |
11 pages |
| Authors:
Yuchun Chen; Shihua Lu; Peter C Chu; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| Lanzhou is one of the major cities in northwest China and the capital of Gansu Province and located at a narrow (2-8 km width), long (40-km), NW-SE oriented valley basin (elevation: 1,500- 1,600-m) with the Tibetan plateau in the west, Baita mountain (above 1,700-m elevation) in the north, and the Gaolan mountain in the south. Due to topographic and meteorological characteristics, Lanzhou is one of the most polluted cities in ... |
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| Fall-Winter Current Reversals on the Texas-Louisiana Continental Shelf |
2005 |
36 pages |
| Authors:
Peter P. Chu; Leonid M. Ivanov; Oleg V. Melnichenko; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| Fall-winter recurrence of current reversal from westward to eastward is identified on the Texas-Louisiana continental shelf using the current meter [Texas-Louisiana Shelf Physical Oceanography Program (LATEX-A)] and near surface drifting buoy [Surface Current and Lagrangian Drift Program (SCULP- 1)] observations in 1993 and 1994. Reversal events roughly satisfy the Poisson distribution with one current reversal nearly every twelve days. Synoptic winds seem responsible for the current reversal events. Other processes ... |
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| The Role of the Halted Baroclinic Mode at the Central Equatorial Pacific in El Nino Event |
2005 |
10 pages |
| Authors:
Jilin Sun; Peter Chu; Qinyu Liu; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| The role of halted "baroclinic modes" in the central equatorial Pacific is analyzed. It is found that dominant anomaly signals corresponding the "baroclinic modes" occur in the upper layer of the equatorial Pacific, in a two-and-a-half layer oceanic model, in assimilated results of a simple OGCM and in the ADCP observation of TAO. A second "baroclinic mode" is halted in the central equatorial Pacific corresponding to a positive SST anomaly ... |
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| Probability Distribution Function of the Upper Equatorial Pacific Current Speeds |
2005 |
19 pages |
| Authors:
Peter C. Chu; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| The probability distribution function (PDF) of the upper (0-50 rn) tropical Pacific current speeds (w), constructed from hourly ADCP data (1990-2007) at six stations for the Tropical Atmosphere Ocean project satisfies the two-parameter Weibull distribution reasonably well with different characteristics between El Nino and La Nina events: In the western Pacific, the PDF of w' has a larger peakedness during the La Nina events than during the El Nino events: ... |
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| Three-Dimensional Hydrodynamic Model for Prediction of Falling Cylinder Through Water Column |
2005 |
12 pages |
| Authors:
Peter C. Chu; Chenwu Fan; Ashley Evans; Anthony F. Gilles; Peter Fleischer; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| A three dimensional hydrodynamic model based on triple coordinate systems is developed to predict translation and orientation of falling rigid cylinder through the water column: earth-fixed coordinate (E-coordinate), cylinder 5 main-axis following coordinate (M-coordinate), and hydrodynamic force following coordinate (F- coordinate). Use of the triple coordinate systems and the transforms among them leads to the simplification of the dynamical system. The body and buoyancy forces and their moments are easily ... |
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| Assessment of Ocean Prediction Model for Naval Operations Using Acoustic Preset |
2005 |
11 pages |
| Authors:
Peter C. Chu; Guillermo Amezaga; Eric L. Gottshall; David S. Cwalina; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| The outcome of a battlefield engagement is often determined by the advantages and disadvantages held by each adversary. On the modern battlefield, the possessor of the best technology often has the upper hand, but only if that advanced technology is used properly and efficiently. In order to exploit this advantage and optimize the effectiveness of high technology sensor and weapon systems, it is essential to understand the impact on them ... |
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| Detection of Suspended Sediment Effect on Sidescan Sonar Imagery Using the Navy's CASS-GRAB Model |
2005 |
8 pages |
| Authors:
P. C. Chu; M. Cornelius; M. Wegstaff; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| Sidescan sonar detects objects buried in the seafloor through generating images of ordnance such as sea mine buried in sediments. The sonar operates by illuminating a broad swath of the seabed using a line array of acoustic projectors while acoustic backscattering from the illuminated sediment volume is measured. The effect of suspended sediment on the sonar imagery depends on the volume scattering strength of the suspended sediment layer. Understanding the ... |
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| Estimation of Geoacoustic Properties in the South China Sea Shelf Using a Towed Source and Vertical Line Hydrophone Array |
DEC 2004 |
49 pages |
| Authors:
John M. Marburger; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| Linear sound sweeps from a towed J15-3 sound source were collected at a moored VLA hydrophone array in the South China Sea during the ASIAEX experiment in May 2001. Measured signals were filtered and pulse compressed. The processed data showed a high signal to noise ratio. Given an a priori chirp sonar survey, a two layer bottom first guess model was constructed. A broadband coupled-mode model was used to perform ... |
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| Surf Zone Eddies Coupled with Rip Current Morphology |
01-Jul-2004 |
16 pages |
| Authors:
Jamie H MacMahan; Ad J Reniers; Ed B Thornton; Tim P Stanton; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| Energetic very low frequency (VLF) surf zone eddies (SZE) were observed on a beach composed of shore-connected shoals with quasi-periodic incised rip channels at Sand City, Monterey Bay, California. Incident waves consisted of predominantly shore-normal narrow-banded swell waves. SZEs were located outside the gravity region in along-shore wave number, spaced within the VLF band, and did not appear to exist in higher-frequency bands. The SZEs were significant and constant in ... |
|
| Mountain-Slope Afforestation for Valley Urban Air-Quality Improvement |
01-Jan-2004 |
8 pages |
| Authors:
Yuchun Chen; Shihua Lu; Peter C Chu; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| Lanzhou is one of the major cities in northwest China and the capital of Gansu Province and located at a narrow (2-8 km width), long (40-km), NW-SE oriented valley basin (elevation: 1,500- 1,600-m) with the Tibetan plateau in the west, Baita mountain (above 1,700-m elevation) in the north, and the Gaolan mountain in the south. Due to topographic and meteorological characteristics, Lanzhou is one of the most polluted cities in ... |
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| San Clemente Island Undersea Range Acoustic Experiment, July 2002 |
04 NOV 2003 |
79 pages |
| Authors:
Christopher W. Miller; Anurag Kumar; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| An at-sea data collection effort was conducted July 24-28, 2002 in support of the Naval Postgraduate School's Tactical Oceanography Course (OC- 4270) off the San Clemente Island Undersea Range (SCIUR). The experiment configuration was designed to provide acoustic propagation measurements for transmission loss, detection range limitation, and acoustic variability in the 1-8 kHz frequency band. This report is provided to document contacts, experiment configuration, execution and collected data sets. |
|
| Subtidal Circulation over the Upper Slope to the West of Monterey Bay, California |
SEP 2003 |
128 pages |
| Authors:
Juan A. Morales; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| Moored current meters were used to describe currents over the continental slope off Monterey Bay, California, from March 1998 to March 2003. The water depth at this location was 1800 m and current observations included depths of 16-88 m, 210-290 m, 305 m and 1200 m although measurements at 16-88 m were not continuous. Poleward currents dominated the flow between 24 and 305 m. At 305 m the mean flow ... |
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| Diagnostic Initialization Generated Extremely Strong Thermohaline Sources and Sinks in the South China Sea |
MAR 2003 |
95 pages |
| Authors:
Ahchuan Ong; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| Ocean modeling is usually constrained by the lack of observed velocity data for the initial condition. Diagnostic initialization is widely used to generate velocity data as an initial condition for ocean modeling. Diagnostic initialization integrates the model from known temperature, salinity, and zero velocity fields and holds temperature and salinity unchanged. After a period of the diagnostic run, the velocity field is established, and the temperature, salinity, and velocity fields ... |
|
| Seasonal Variability of Thermohaline Front in the Central South China Sea |
2003 |
15 pages |
| Authors:
Peter C. Chu; Wang Guihua; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| An upper layer thermohaline front across the South China Sea (SCS) basin from the South Vietnamese coast (around 15 deg N) to Luzon Island (around 19 deg N) has been identified using the Navy's open domain Generalized Digital Environmental Model (GDEM) monthly mean temperature and salinity data on a O.5 deg X O.5 deg grid. This front does not occur at the surface in summer. The strength of this front ... |
|
| Determination of the South China Sea Surface Height Variability Using TOPEX/POSEIDON Data |
2003 |
11 pages |
| Authors:
Peter C. Chu; Jing Wang; Yiquan Qi; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| The monthly mean TOPEX/POSEIDON crossover data in the South China Sea are used to investigate the spatial and temporal variability of sea surface height anomaly (SSHA). Multi-time scale variability is found using the empirical orthogonal function (EOF) analysis. The seasonal variability dominates SSHA with two spatial patterns: basin-wide gyre and north-south double gyres. The intraseasonal variability of SSH has high spatial variability at the continental shelf such as west of ... |
|
| Summary of Research 2001, Department of Oceanography, Graduate School of Engineering and Applied Sciences |
SEP 2002 |
78 pages |
| Authors:
Mary L. Batteen; Jeffrey D. Paduan; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| This report contains project summaries of the research projects in the Department of Oceanography A list of recent publications is also included, which consists of conference presentations and publications, books, contributions to books, published journal papers, and technical reports Thesis abstracts of students advised by faculty in the Department are also included. |
|
| Three Dimensional Hydrodynamic Mine Impact Burial Prediction |
Sep-2002 |
54 pages |
| Authors:
Ashley Evans; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| Work Overview: 1) Participated in two critical path experiments within the ONR sponsored Mine Burial Prediction Program: First--Carderock Mine Drop Experiment, 10-14 Sept 2001 NSWC-CCD, Carderock, MD, 1/3 scale mine shapes, 5 meters depth; Second--Corpus Christi Mine Drop Experiment 2, 17 May 2002 Corpus Christi Mine Warfare Operating Areas, full scale mine drops, 16-18 meters depth. 2) Full data analysis of 1/15 scale mine drop (Gilless 2001) and 1/3 scale ... |
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| Japan Sea Thermohaline Structure and Circulation, Part 3: Autocorrelation Functions |
JUN 2002 |
21 pages |
| Authors:
Peter C. Chu; Wang Guihua; Yuchun Chen; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
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| The autocorrelation functions of temperature and salinity in the three basins (Ulleung, Japan, and Yamato Basins) of the Japan/East Sea are computed using the U.S. Navy s Master Oceanographic Observational Dataset for 1930-97. After quality control the dataset consists of 93 810 temperature and 50 349 salinity profiles. The decorrelation scales of both temperature and salinity were obtained through fitting the autocorrelation function into the Gaussian function. The signal-to-noise ratios ... |
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| Linear and Nonlinear Perspectives of Forecast Error Estimate Using the First Passage Time |
16-Jan-2002 |
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| Authors:
Peter C Chu; Leonid M Ivanov; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
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| Traditionally, the prediction skill of atmospheric models is verified through small amplitude stability analysis. The Lyapunov exponent (LE) and singular vector (SV) decomposition methods are the two popular approaches (e.g. Lorenz, 1984, Dalcher and Kalnay, 1987; Farrell and Ioannou, 1996; Vannitsem and Nicolis, 1997 and others). The model stability is defined as sensitivity to small errors in initial conditions (the first kind of predictability) and measured by an e-folding time ... |
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| Backward Fokker-Planck Equation for Determining Model Valid Prediction Period |
01-Jan-2002 |
11 pages |
| Authors:
Chenwu Fan; Peter C Chu; Leonid M Ivanov; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
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| A new concept, valid prediction period (VPP), is presented here to evaluate ocean (or atmospheric) model predictability. VPP is defined as the time period when the prediction error first exceeds a predetermined criterion (i.e., the tolerance level). It depends not only on the instantaneous error growth but also on the noise level, the initial error, and the tolerance level. The model predictability skill is then represented by a single scalar, ... |
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| South China Sea Surface Elevation Variability Determined From TOPEX/POSEIDON Data |
2002 |
7 pages |
| Authors:
Peter C. Chu; Jing Wang; Yiquan Qi; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
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| The South China Sea (SCS) is a semi-enclosed tropical and sub-tropical sea located between the Asian land mass (including Taiwan) to the west and north, the Philippine Islands to the east and Malaysia and Borneo to the south, a total of 3.5 10 (exp 6) sq km surface area. The observed circulation patterns of the intermediate to upper layers of the SCS are also primarily forced by the local monsoon ... |
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| Summary of Research 2000: Department of Oceanography |
DEC 2001 |
69 pages |
| Authors:
Roland W. Garwood; Edward B. Thornton; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
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| This report contains project summaries of the research projects in the Department of Oceanography. A list of recent publications is also included, which consists of conference presentations and publications, books, contributions to books, published journal papers, and technical reports. Thesis abstracts of students advised by faculty in the Department are also included. |
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