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Open Source Remote Sensing:Introspect And Prospect, Sanggoo Kang, Hee Young Yoo, Kiwon Lee
Open Source Remote Sensing:Introspect And Prospect, Sanggoo Kang, Hee Young Yoo, Kiwon Lee
Journal of Marine Science and Technology
It is noteworthy that open source applications have been developed and studied in various fields as well as remote sensing field. Open sources for GIS have long history related to open standards over three decades, but those of remote sensing do relatively short. Moreover, there are still no summary reports for open sources for remote sensing. In this study, we summarized characteristics of open source applications for remotely sensed image processing and discussed their strengths and weaknesses at first. Based on the summary, two open source applications for InSAR Processing and Geographic Object-Based Image Analysis are practically implemented to introspect …
Assessment Of Disaster Losses In Rice Paddy Field And Yield After Tsunami Induced By The 2011 Great East Japan Earthquake, Yuei-An Liou, Hsueh-Chun Sha, Ting-Ming Chen, Tai-Sheng Wang, Yi-Ting Li, Yen-Cheng Lai, Min-Hsin Chiang, Li-The Lu
Assessment Of Disaster Losses In Rice Paddy Field And Yield After Tsunami Induced By The 2011 Great East Japan Earthquake, Yuei-An Liou, Hsueh-Chun Sha, Ting-Ming Chen, Tai-Sheng Wang, Yi-Ting Li, Yen-Cheng Lai, Min-Hsin Chiang, Li-The Lu
Journal of Marine Science and Technology
The Great East Japan Earthquake on 11 March 2011 triggered an extremely destructive tsunami that hit the Tohoku region of Japan severely. According to data from the Ministry of Agriculture, Forestry, and Fishes of Japan, Tohoku accounted for 27.59% of Japan’s rice yield in 2010. It is an impact to a country that relies on rice as its main food source. This paper utilizes remote sensing techniques to estimate the disaster losses in rice field and yield in Fukushima and Miyagi, the most severely damaged coastal prefectures of the Tohoku region, by using a developed Rice field Identification and riCe …
Quantataive Analysis Of Relationship Between Alos Palsar Backscatter And Forest Stand Volume, Choen Kim
Quantataive Analysis Of Relationship Between Alos Palsar Backscatter And Forest Stand Volume, Choen Kim
Journal of Marine Science and Technology
To estimate forest stand volume, topographic effects should be considered in Synthetic Aperture Radar (SAR) data processing, because most forests are located on mountainous areas in Korea. This paper shows how the effects on the ALOS Phased-Array L-Band SAR (PALSAR) backscatter in Kwangneung Experiment Forest can be reduced by gammanought γ 0 . Regardless of coniferous and deciduous forests, the gammanought γ 0 values are always lower compared to the sigmanought σ0 values at HH and HV polarization for 58 standwise tree volume of the fore-slope (here, the west-facing slope) and are always higher in case of far-slope (here, east-facing …
A Geomorphological Model For Landslide Detection Using Airborne Lidar Data, Jin-King Liu, Kuo-Hsin Hsiao, Peter Tian-Yuan Shih
A Geomorphological Model For Landslide Detection Using Airborne Lidar Data, Jin-King Liu, Kuo-Hsin Hsiao, Peter Tian-Yuan Shih
Journal of Marine Science and Technology
This study analyzes multi-temporal LiDAR data of high accuracy and high resolution by installing a geomorphometric model for extracting landslides. First, two sets of LiDAR data were acquired for before and after a heavy rainfall event. The landslides which took place from 2005 to 2009 were classified automatically by satellite images, and subsequently the landslides were interpreted and edited manually. Geomorphometric parameters including slope, curvature, OHM, OHM roughness, and topographic wetness index were then extracted using stencils of landslide polygons overlaid on respective thematic maps derived from LiDAR, DEM and DSM. The ranges of every parameter were derived from the …
The Tsunami Of March 11, 2011 As Observed By The Network Of Tide Gauges Of French Polynesia, Jean-Pierre Barriot, Jonathan Serafini, Lydie Sichoix, Dominique Reymond, Olivier Hyvernaud
The Tsunami Of March 11, 2011 As Observed By The Network Of Tide Gauges Of French Polynesia, Jean-Pierre Barriot, Jonathan Serafini, Lydie Sichoix, Dominique Reymond, Olivier Hyvernaud
Journal of Marine Science and Technology
We present here the network of tide gauges spanning French Polynesia, and the set of records made by this network of the tsunami wave of March 11, 2011 (Tōhoku earthquake). We also outline the least-squares procedure used to separate the tsunami signal from the oceanic tides signal.
An Object-Oriented Analysis For Characterizing The Rainfall-Induced Shallow Landslide, Kuan-Tsung Chang, Jin-King Liu, Chu-I Wang
An Object-Oriented Analysis For Characterizing The Rainfall-Induced Shallow Landslide, Kuan-Tsung Chang, Jin-King Liu, Chu-I Wang
Journal of Marine Science and Technology
Landslides are natural phenomena for the dynamic balance of the earth's surface. Because of frequent occurrences of typhoons and earthquakes in Taiwan, mass movements are common threats to people's lives. In this paper, the interpretation of knowledge is quantified as recognition criteria. Multisource high-resolution data, for example, a SPOT satellite image, 20 m × 20 m Digital Terrain Model (DTM) reduced from Light Detection And Ranging (LiDAR) data, and aerial orthophotos were used to construct the feature space for landslide analysis. Landslides were recognized by an objectoriented method combining edge-based segmentation and a Supported Vector Machine (SVM) method. The classification …
Rainwater Utilization To Reduce Flooding In Low-Lying Areas Of Taipei City, Taiwan, Andrew Lo
Rainwater Utilization To Reduce Flooding In Low-Lying Areas Of Taipei City, Taiwan, Andrew Lo
Journal of Marine Science and Technology
She-Zih is a low-lying area in Taipei City where the Tanshui River and Keelung River meet. Average elevation is about 2.5 m. Perennial flood events occur very often. The only flood prevention facility is the 6 m levee built around the perimeter to overcome 20-yr flood events. The main cause of the flooding problem is the instantaneous extreme high rainfall events that often exceed the drainage capacity of She-Zih. Current solutions to relieve this water hazard, suggested by the Water Resources Agency, include channel widening and many water pumping installations. At present, all emergency facilities are insufficient to combat unexpected …
Evaluating The Uncertainty Of The Population Growth Parameter Estimates Of Larval Anchovy In The Southwestern Waters Of Taiwan Using Monte Carlo Simulations, Sheng-Ping Wang, Ming-An Lee, Wen-Yu Chen
Evaluating The Uncertainty Of The Population Growth Parameter Estimates Of Larval Anchovy In The Southwestern Waters Of Taiwan Using Monte Carlo Simulations, Sheng-Ping Wang, Ming-An Lee, Wen-Yu Chen
Journal of Marine Science and Technology
To estimate the population growth parameter (maximum sustainable yield, carrying capacity, catchability, the ratio of initial biomass to carrying capacity and model shape parameter) of larval anchovy in the southwestern waters of Taiwan, a non-equilibrium production model was used to fit to historical catch data and standardized CPUE series. The results of standardized CPUE indicated that the sea surface temperature was the most effective variable for explaining the CPUE variation of larval anchovy abundance. This study also evaluated impact of the uncertainty associated with the catch and CPUE data on the model estimations using Monte Carlo simulations. Although the impacts …
Super Long Conductive Channel Production By Impulsar, Victor Victor Apollonov, Nikolay Vlad Pletnev
Super Long Conductive Channel Production By Impulsar, Victor Victor Apollonov, Nikolay Vlad Pletnev
Journal of Marine Science and Technology
The attempts to create a super long conductive channels were taken in order to study the upper atmosphere and to settle special tasks, related to solar energy transmission, accumulated by orbital solar stations. There upon the program of creation of “Impulsar” represents a great interest, as this program in a combination with high-voltage high repetition rate electrical source can be useful to solve the above mentioned problems. The principle of conductive channel production can be shortly described as follows. The “Impulsar”- laser jet engine vehicle - propulsion take place under the influence of powerful high repetition rate pulse-periodic laser radiation. …
Seasonal Prediction Of Climate Extremes For The Pacific: Tropical Cyclones And Extreme Ocean Temperatures, Yuriy Kuleshov, Claire Spillman, Yan Wang, Andrew Charles, Roald De Wit, Kay Shelton, David Jones, Harry Hendon, Catherine Ganter, Andrew Watkins, Jemishabye Apajee, Aurel Griesser
Seasonal Prediction Of Climate Extremes For The Pacific: Tropical Cyclones And Extreme Ocean Temperatures, Yuriy Kuleshov, Claire Spillman, Yan Wang, Andrew Charles, Roald De Wit, Kay Shelton, David Jones, Harry Hendon, Catherine Ganter, Andrew Watkins, Jemishabye Apajee, Aurel Griesser
Journal of Marine Science and Technology
Climate change and climate extremes have a major impact on Australia and Pacific Island countries. Of particular concern are tropical cyclones and extreme ocean temperatures. As a practical response to climate change, through the Pacific Australia Climate Change Science and Adaptation planning Program (PACCSAP), enhanced web-based information tools to provide seasonal forecasts for climatic extremes in the Western Pacific have been developed. Using the dynamical seasonal prediction model POAMA (Predictive Ocean Atmosphere Model for Australia), we aim to improve accuracy of seasonal forecasts of tropical cyclone activity and extreme sea surface temperatures for the Western Pacific. Since the PACCSAP has …
Quantification Of Carbon Emission Reduction By U-Transportation Service Effect: A Case Study Of Dongtan U-City, Tae-Woong Jung, Mu-Wook Pyeon, Jee-Hee Koo
Quantification Of Carbon Emission Reduction By U-Transportation Service Effect: A Case Study Of Dongtan U-City, Tae-Woong Jung, Mu-Wook Pyeon, Jee-Hee Koo
Journal of Marine Science and Technology
With the emergence of the response to climate change as a global agenda, UNFCCC member countries must report their Greenhouse Gas (GHG) emissions and absorptions. With conventional carbon emission estimation methods such as the IPCC Guideline, however, it is impossible to measure reduction of carbon emissions by U-City services. Therefore, this study proposed estimating carbon emission reductions by using U-transportation services as a model because this service appears to be the most effective among U-City services in terms of carbon emission reduction. This approach which is unique in Korea has also attempted to quantify the reduction of carbon emissions by …
Cold Sea Surface Temperature Near Cheju Island Responding To Strong Cyclonic Wind And Positive Geopotential Tendency Behind A Typhoon Center Along Its Track, Hyo Choi, Mi-Sook Lee, Soo Min Choi
Cold Sea Surface Temperature Near Cheju Island Responding To Strong Cyclonic Wind And Positive Geopotential Tendency Behind A Typhoon Center Along Its Track, Hyo Choi, Mi-Sook Lee, Soo Min Choi
Journal of Marine Science and Technology
The response of sea surface temperature (SST) before and after the passage of Typhoon-18 Songda in the vicinity of Chjeu Island in the southern sea of Korea was investigated using satellite-derived GOES-MCSST (SST), GOES infrared cloud image and a three dimensional WRF-3.0 model with FNL initial meteorological data on September 5 to 8, 2004. On September 4, before the typhoon passed by Cheju Island, the SST extending southwards and eastwards of the island was 27°C. However, after the typhoon passed by the island at 2100 LST, September 7, the SST decreased by 2°C to 25°C. Asymmetrical-cyclonic surface wind generated by …
Early-Summer Ichthyoplankton Biodiversity Associated With Oceanic Factors On The Continental Shelf Of The Southern East China Sea, Wen-Yu Chen, Yi-Chen Wang, Ming-An Lee
Early-Summer Ichthyoplankton Biodiversity Associated With Oceanic Factors On The Continental Shelf Of The Southern East China Sea, Wen-Yu Chen, Yi-Chen Wang, Ming-An Lee
Journal of Marine Science and Technology
Ichthyoplankton communities associated with oceanic factors on the continental shelf of the southern East China Sea were studied in early summer 2009. Temperature and salinity of the stations in this survey respectively varied 13.78~ 27.86°C and 33.14~34.77 psu. In total, 1204 fish larval individuals belonging to 62 families and 120 taxa were identified. Using a cluster analysis, the spatial distributions of larval fish were classified into 3 groups: a coastal group, a shelf group, and an offshore group. The offshore group was further divided into 2 subgroups: a mixed shelf group and a Kuroshio group. The coastal group consisted of …
Interannual Variability Of Wintertime Sea Surface Temperatures In The Eastern Taiwan Strait, Mu-Tun Tzeng, Kuo-Wei Lan, Jui-Wen Chan
Interannual Variability Of Wintertime Sea Surface Temperatures In The Eastern Taiwan Strait, Mu-Tun Tzeng, Kuo-Wei Lan, Jui-Wen Chan
Journal of Marine Science and Technology
Using Advanced Very High Resolution Radiometer (AVHRR) sea surface temperatures (SSTs) at a 1.1-km spatial resolution, we investigated the long-term SST variability in winter in the eastern Taiwan Strait (TS) in 1995~2008. We performed an empirical orthogonal function (EOF) analysis of spatial and time series variances for 15-day mean images. The first three modes in the EOF analysis respectively accounted for 25.9%, 16.61% and 4.59% of variances. In the first mode, the spatial amplitude showed positive values in the northeastern TS and negative values south of Chang-Yuen Rise (CYR). This suggests that warmer water occurred south of the CYR and …
Integration Of Accounting-Based And Option-Based Models To Predict Construction Contractor Default, Lung-Ken Tsai, Hui-Ping Tserng, Hsien-Hsing Liao, Po-Cheng Chen, Wen-Pei Wang
Integration Of Accounting-Based And Option-Based Models To Predict Construction Contractor Default, Lung-Ken Tsai, Hui-Ping Tserng, Hsien-Hsing Liao, Po-Cheng Chen, Wen-Pei Wang
Journal of Marine Science and Technology
This paper aims to predict construction contractor default, which is excluded by most extant studies, due to the distinct characteristics of construction industry. Default predicting models developed in past literatures are mostly built by accounting information, yet accounting sheets have innate flaws. To calculate default probability, several recent studies applied the option pricing theory, which presumes that the stock market is efficient. This presumption isn't always true in real life. In this paper, a hybrid model is proposed. It combines information from both models by inputting the default probability from the option-based model into the accounting-based model. As the measure …
An Excited System Design For The Maximum Output Of Induction Generator Based On Vector Control, Ding-Tsair Su, Ying-Shing Shiao, Koan-Yuh Chang, Wen-Jer Chang
An Excited System Design For The Maximum Output Of Induction Generator Based On Vector Control, Ding-Tsair Su, Ying-Shing Shiao, Koan-Yuh Chang, Wen-Jer Chang
Journal of Marine Science and Technology
In this paper, without using the mechanical speed regulator, we propose a scheme that can control the output power of an induction generator by controlling the excited current. To attain this goal, an inverter is designed as a current controlled source, to supply an excited current for the induction generator. Furthermore, using the dq axes theory, a vector controller is designed by a digital signal processor (DSP) for controlling the inverter which supplies excited current appropriately in accordance with the wind speed to regulate the induction generator output power. Finally, the experimental results have shown good performances of the proposed …
Port Management Improvement Strategies Based On Simulation Model, Wen-Chih Huang, Tu-Cheng Kuo, Ching-Tsyr Wu, Cheng-Chen Kuo
Port Management Improvement Strategies Based On Simulation Model, Wen-Chih Huang, Tu-Cheng Kuo, Ching-Tsyr Wu, Cheng-Chen Kuo
Journal of Marine Science and Technology
Management performance of container terminal is an important factor of port competitiveness. In the past, ports had often increased performance by expanding the number of berths and equipment. However, recent global recession has significantly dampened the growth of the international trade. Thus, port authority must seek effective utilization of the capacities of its container terminals. Most ocean carriers in the Port of Kaohsiung in Taiwan rent multiple berths that are often dispersed to different container terminals, resulting in inefficient handling. Establishing terminal operators to optimize berth assignment may resolve this problem. The objective of this research is to construct a …
Behavior Of Regular Triangular Joints Under Cyclic Shearing, Shuh-Gi Chern, Tsu-Chiang Cheng, Wen-Ya Chen
Behavior Of Regular Triangular Joints Under Cyclic Shearing, Shuh-Gi Chern, Tsu-Chiang Cheng, Wen-Ya Chen
Journal of Marine Science and Technology
Synthetic regular triangular joints made of gypsum plaster were cyclicly sheared to measure asperity degradation and mathematical behavior of regular triangular joints. Laboratory cyclic shear tests were conducted for three joint types under three different normal stresses. Asperity degradation and shear strength of joints were found to be a function of joint roughness, normal stress, shearing displacement and number of loading cycles. Based on the experimental results, mathematical models were developed for evaluation of shear strength in cyclic loading conditions. Comparison of the test results with that of the proposed model, it was found a good agreement was observed.
Influence Of The Marine Environment Variability On The Yellowfin Tuna (Thunnus Albacares) Catch Rate By The Taiwanese Longline Fishery In The Arabian Sea, With Special Reference To The High Catch In 2004, Kuo-Wei Lan, Tom Nishida, Ming-An Lee, Hsueh-Jung Lu, Hsiang-Wen Huang, Shui-Kai Chang, Yang-Chi Lan
Influence Of The Marine Environment Variability On The Yellowfin Tuna (Thunnus Albacares) Catch Rate By The Taiwanese Longline Fishery In The Arabian Sea, With Special Reference To The High Catch In 2004, Kuo-Wei Lan, Tom Nishida, Ming-An Lee, Hsueh-Jung Lu, Hsiang-Wen Huang, Shui-Kai Chang, Yang-Chi Lan
Journal of Marine Science and Technology
In this study, we collected Taiwanese longline (LL) fishery data and environment variables during the period of 1998- 2004 to investigate the relationship between LL catch data of yellowfin tuna (YFT) and oceanic environmental factors using a principal component analysis (PCA). Results of the PCA showed that monthly variations in catch per unit effort (CPUE) values were significantly correlated with the sea surface temperature (SST), subsurface temperature at 105 m, thermocline depth (horizontal) gradient magnitude, chlorophyll-a concentration, and fish size. April and May were the warmest months of the year in terms of the SST, and the thermocline was generally …
Free Vibration Analysis Of A Hybrid Beam Composed Of Multiple Elastic Beam Segments And Elastic-Supported Rigid Bodies, Hsien-Yuan Lin, Chin-Yu Wang
Free Vibration Analysis Of A Hybrid Beam Composed Of Multiple Elastic Beam Segments And Elastic-Supported Rigid Bodies, Hsien-Yuan Lin, Chin-Yu Wang
Journal of Marine Science and Technology
This paper aims at presenting a method to determine the “exact” natural frequencies and mode shapes of a hybrid beam composed of multiple elastic beam segments and multiple rigid bodies with each rigid body connected with two adjacent elastic beam segments. Furthermore, each rigid body has its own mass and rotary inertia, and is supported by a translational spring and/or a rotational spring. First, based on the equations of the continuity of deformations and the equilibrium of moments and forces for each of the intermediate rigid bodies and boundary conditions, the coefficient matrices of the entire hybrid beam are derived. …
Performance Comparison Of The Stbc-Ofdm Decoders In A Fast Fading Channel, Chi-Min Li, Guo-Wei Li, Han-Yi Liu
Performance Comparison Of The Stbc-Ofdm Decoders In A Fast Fading Channel, Chi-Min Li, Guo-Wei Li, Han-Yi Liu
Journal of Marine Science and Technology
In a fast fading channel, the orthogonality of the two consecutive STBC-OFDM symbols will be destroyed and the received signals can not be perfectly separated. As a result, the bit error rate (BER) performance will be degraded seriously. In this paper, we analyze several co-channel interference (CCI) cancellation decoders for the STBC-OFDM in a fast fading channel including the Alamouti method, SIC method, ML method, DMLD method, and a proposed DZFD method. The proposed DZFD method has the advantage of reducing the computational complexity for the DMLD method. We also conduct the outdoor channel measurements to verify the CCI cancellation …
A Partition Dummy Sequence Insertion Papr Reduction Method Of The Ofdm System, Chi-Min Li, Jia-Chyi Wu, Chao-Chin Tseng
A Partition Dummy Sequence Insertion Papr Reduction Method Of The Ofdm System, Chi-Min Li, Jia-Chyi Wu, Chao-Chin Tseng
Journal of Marine Science and Technology
OFDM (Orthogonal Frequency Division Multiplexing) technique has been widely adopted in many wireless communication systems due to its high data-rate transmission ability and robustness to the multipath fading channel. One major drawback of the OFDM signal is the high peak-toaverage power ratio (PAPR) problem. The high PAPR results in the in-band distortion and out-of-band radiation when the OFDM signal is fed into a nonlinear power amplifier (PA). In this paper, we propose a partition dummy sequence insertion (PDSI) method to reduce the PAPR problem. Simulation results of the PAPR reduction and bit error rate (BER) performance for the proposed method …
Effects Of Non-Newtonian Couple Stresses On The Dynamic Characteristics Of Wide Rayleigh Step Slider Bearings, Jaw-Ren Lin, Li-Ming Chu, Wei-Liang Liaw
Effects Of Non-Newtonian Couple Stresses On The Dynamic Characteristics Of Wide Rayleigh Step Slider Bearings, Jaw-Ren Lin, Li-Ming Chu, Wei-Liang Liaw
Journal of Marine Science and Technology
To provide more information in fluid-film lubricated bearings, the effects of non-Newtonian couple stresses on the dynamic characteristics of Rayleigh step slider bearings have been presented in this paper. According to the results, the effects of non-Newtonian couple stresses signify an improvement in the bearing characteristics. Comparing with the Newtonian-lubricant Rayleigh step bearing, the nonNewtonian couple stress effects provide an increase in the steady load-carrying capacity, the dynamic stiffness coefficient and the dynamic damping coefficient, as well as a reduction in the steady volume flow rate required. In order to guide the use of the present study, a numerical example …
A Grouping Analysis For The Similarity Of Ship Fleet Composition Among Leading Container Carriers, Hua-An Lu
A Grouping Analysis For The Similarity Of Ship Fleet Composition Among Leading Container Carriers, Hua-An Lu
Journal of Marine Science and Technology
Tonnage supply of the liner shipping industry is highly concentrated and continuously growing. Carriers provide ship capacities by various fleet composition strategies for coping with their service networks. This paper explores the similarity of fleet supply among the top 20 global liner carriers in terms of data gathered at the beginning of 2008. A scatter analysis is applied to simply show the difference in two-dimensional elements. This research also attempts to group these carriers with cluster analysis by appending more attributes concerned with fleet composition. Results reveal that MSC, Evergreen, COSCO, CSCL, and Yang Ming always form a firm cluster …
Effect Of Mulberry Lees Addition On The Quality Of Bread And Anthocyanin Content, Jean-Yu Hwang, Wen-Chieh Sung
Effect Of Mulberry Lees Addition On The Quality Of Bread And Anthocyanin Content, Jean-Yu Hwang, Wen-Chieh Sung
Journal of Marine Science and Technology
Mulberry lees were added to bread dough at levels of 10%, 20%, and 30%. Loaves were prepared using the straight dough procedure. Bread volume, crust and crumb color, crumb texture, flavor and overall acceptability were evaluated. Anthocyanin content of crumbs was determined for 5 days storage duration. The volume of bread was decreased (p < 0.05) as the mulberry lees addition amount increased. Overall acceptability of 10% mulberry lees addition bread was highest among all breads. There was no significant difference in crumb texture except the firmness of 30% mulberry lees addition was higher than other groups. Addition of mulberry lees increased the anthocyanin content of crumb. Oxidation of anthocyanin occurs in crumbs during storage. Mulberry lees could be added to bread within 20% level for enhancing the nutritional quality and characteristics of bread.
Use Of Real-Time Pcr To Detect Surimi Adulteration In Vegetarian Foods, Ching-Yang Cheng, Yeu-Ching Shi, Sin-Rong Lin, Chi-Chiang Chou, Chin-Cheng Huang
Use Of Real-Time Pcr To Detect Surimi Adulteration In Vegetarian Foods, Ching-Yang Cheng, Yeu-Ching Shi, Sin-Rong Lin, Chi-Chiang Chou, Chin-Cheng Huang
Journal of Marine Science and Technology
Vegetarian foods are abundant in the domestic market. It is found that animal ingredients have been added into vegetarian products to improve the texture and taste. Surimi adulteration in vegetarian food is an area of concern for vegetarians. The α-skeletal actin gene of aquatic animals as novel specific primers and probe of Actinopterygii in 36 fish species are tested using real-time PCR method. It was found that all of the 36 fish species of Actinopterygii showed positive results. The 10 surimi products, 10 surimi-based products containing fish components showed positive results. All of the 10 fresh foods containing no fish …
Optimal Dynamic Temporal-Spatial Paramter Inversion Methods For The Marine Integrated Element Water Quality Model Using A Data-Driven Neural Network, Ming-Chang Li, Shu-Xiu Liang, Zhao-Chen Sun, Guang-Yu Zhang
Optimal Dynamic Temporal-Spatial Paramter Inversion Methods For The Marine Integrated Element Water Quality Model Using A Data-Driven Neural Network, Ming-Chang Li, Shu-Xiu Liang, Zhao-Chen Sun, Guang-Yu Zhang
Journal of Marine Science and Technology
Certain marine water quality or ecosystem model parameters vary in space and time because of different plankton taxonomic compositions over a large domain. The same parameter vectors can result in suboptimal calibration. In the present paper, a data-driven model based on an artificial neural network is developed to inverse the values of model parameters dynamically. All training data used are calculated using numerical water quality models from the results of multiparameter matching design cases such that physical properties are not disturbed. The aim is to determine the relationship between the model parameters and the pollution concentration values of interior stations. …
Inverting Sediment Sound Speed Profile Using A Parameterized Geoacoustic Model: Numerical And Statistical Analysis, Chen-Fen Huang, Shih-Feng Yang, Jin-Yuan Liu
Inverting Sediment Sound Speed Profile Using A Parameterized Geoacoustic Model: Numerical And Statistical Analysis, Chen-Fen Huang, Shih-Feng Yang, Jin-Yuan Liu
Journal of Marine Science and Technology
The objective of this paper is to develop and evaluate an inversion algorithm for estimating the parameters in a geoacoustic model for a marine sediment layer. The geoacoustic model employs a generalized-exponential function for sound speed profile, and an inverse-square function for density distribution. Based upon plane-wave reflection from a nonuniform sediment layer overlying an elastic seafloor, an inversion procedure is established and numerically implemented for estimating the parameters using synthetic noisecontaminated data. The sensitivity of each model parameter is first studied, and then three highly sensitive parameters in the geoacoustic model and one statistical parameter are chosen for inversion …
Shallow Water Flow Modeling Using Space-Time Least-Squares Finite-Element Method, Shin-Jye Liang, Chiung-Yang Lan, Ying-Chih Chen
Shallow Water Flow Modeling Using Space-Time Least-Squares Finite-Element Method, Shin-Jye Liang, Chiung-Yang Lan, Ying-Chih Chen
Journal of Marine Science and Technology
Various aglogrithms of least-squares finite-element methods (LSFEM) for convection-diffusion equation (CDE) and shallow-water equations (SWE) are formulated. The associated condition number of the resulting system of equations is systematically compared. It is found that condition number of the resulting system of equations depends on the choice of variables, interpolations, and size of element (∆x). In general, a better conditioned system is obtained by introducing auxiliary variable with low-order interpolation. The developed better conditioned shallow-water model is used to simulate wave propagation over a submerged bar and wave propagation past an elliptical hump. Computed results are compared with experiment data and …
Design And Implementation Of An Simulation Of Water Wave Transformation Using Higher Order Mild-Slope Equation, Yuan-Jyh Lan, Tai-Wen Hsu, Ta-Yuan Lin, Shin-Jye Liang
Design And Implementation Of An Simulation Of Water Wave Transformation Using Higher Order Mild-Slope Equation, Yuan-Jyh Lan, Tai-Wen Hsu, Ta-Yuan Lin, Shin-Jye Liang
Journal of Marine Science and Technology
A higher-order mild-slope equation (HOMSE) is derived based on theory of Hsu et al. [14]. Depth function is approximated up to third-order accurate in terms of both wave nonlinearity and bottom slope. Classical Galerkin method is used to solve HOMSE. Developed model is verified with a series of benchmark tests, including propagation of a sinusoidal wave past a submerged bar, wave propagating on a sloping bed, wave propagating over an elliptic shoal on a uniform slope, and wave propagating through a semicircular slope bottom, respectively. Computed results are compared with experiment data and prediction of low-order mild-slope equation model as …