Ziyin Wu

• Ph.D
• Managing Director at Second Institute of Oceanography

Marine researchers rely heavily on ocean sound velocity, a crucial hydroacoustic environmental metric that exhibits large geographical and temporal changes. Nowadays, spatio-temporal series prediction algorithms are emerging, but their prediction accuracy requires improvement. Moreover, in terms of ocean sound speed, most of these models predict an...

The recognition and segmentation of seafloor topography play a crucial role in marine science research and engineering applications. However, traditional methods for seafloor topography recognition and segmentation face several issues, such as poor capability in analyzing complex terrains and limited generalization ability. To address these challen...

Seafloor topography data are fundamental for marine resource development, oceanographic research, and maritime rights protection. However, approximately 75% of the ocean remains unsurveyed for bathymetry. Sole reliance on shipborne measurements is insufficient for constructing a global bathymetric model within a short timeframe; consequently, satel...

The seabed sediment classification plays an im-portant part in marine ecological environment protection and other related fields. To fully explore the application ability of marine geographic information in seabed sediment classification, the paper makes a contribution to overcome the low accuracy and reliability shortcomings of using single data s...

台湾海峡是我国最大的海峡，也是东海和南海进行物质和能量交换的主要通道。海峡内地形变化剧烈，海洋动力环境复杂，加上两侧众多山溪性河流携带大量泥沙流入海洋，是研究动力沉积作用的理想场所。目前，由于缺乏海峡整体的高分辨率地形以及相关实测水文数据，以整个台湾海峡为研究区域的动力沉积模拟尚不多见。本文基于高分辨率地形和相关水文数据，建立了台湾海峡水动力数值模型，耦合泥沙输运模块，模拟台湾海峡的动力沉积过程，并用现场观测资料对模型进行了验证。动力模拟结果表明，台湾海峡的潮流流场由南、北两个潮波控制，具有明显的时间和空间特征，潮流流速夏季大于冬季，海峡中部小于南北两侧，北侧小于南侧。基于冲淤模拟结果，将台湾海峡划分为淤积区、侵蚀区、冲淤平衡区三大类共计7个沉积分区，淤积区沉积速率最大可达5 cm/a，主要...

Understanding the topographic patterns of the seafloor is a very important part of understanding our planet. Although the science involved in bathymetric surveying has advanced much over the decades, less than 20% of the seafloor has been precisely modeled to date, and there is an urgent need to improve the accuracy and reduce the uncertainty of un...

Polymetallic nodules are spherical or ellipsoidal mineral aggregates formed naturally in deep-sea environments. They contain a variety of metallic elements and are important solid mineral resources on the seabed. How best to quickly and accurately identify polymetallic nodules is one of the key questions of marine development and deep-sea-mineral-r...

海底麻坑是地层中流体沿着运移通道溢出海底，侵蚀海底沉积物形成的凹陷地貌。本文利用最新获取的船测高分辨率水深数据和浅地层剖面数据，对南海日积礁南侧海底麻坑分布及其发育规律进行了研究。基于高分辨率地貌学特征和浅地层剖面规律识别并统计了区内219个总体规模较大的麻坑，经分析发现，海水水深和麻坑规模具有较弱相关性：水深与麻坑直径、坑深呈不明显正相关，与内壁坡度呈不明显负相关。揭示了区内特殊地貌和麻坑的分布、形态、变化之间的内在关系：圆形和椭圆形普通麻坑多分布于海丘丘顶部位；半月型大型麻坑多分布于海丘中下部；而串珠状拉长型巨型麻坑则主要分布于深海丘间峡谷。本区麻坑形态和规模从丘顶到峡谷的变化直接对应了麻坑不同阶段的发育过程，其本质受区内构造和动力学控制。

Sea ice is a significant factor in influencing environmental change on Earth. Monitoring sea ice is of major importance, and one of the main objectives of this monitoring is sea ice classification. Currently, synthetic aperture radar (SAR) data are primarily used for sea ice classification, with a single polarization band or simple combinations of...

The near-trench coseismic rupture behaviour of the 2011 Tohoku–Oki earthquake remains poorly understood due to the scarcity of near-field observations. Differential bathymetry offers a unique approach to studying offshore coseismic seafloor deformation but has a limited horizontal resolution. Here we use differential bathymetry estimates with impro...

Shallow bathymetry is important for ocean exploration, and the development of high-precision bathymetry inversion methods, especially for shallow waters with poor quality, is a major research aim. Synthetic aperture radar (SAR) image data benefit from a wide coverage, high measurement density, rapidity, and low consumption but are limited by low ac...

The delimitation and naming of seabed geographic entities is one of the hot research issues in the field of international maritime rights and interests. However, due to the lack of quantitative definition technology for the boundaries of seabed geographic entities, the determination of the boundaries is inevitably artificial. For this reason, this...

Precision bottom tracking is a core step in the data processing of side scan sonar (SSS), which is of critical value for the quality of the final SSS production. Currently, the automatic precision SSS bottom tracking remains challenging due to the complex noise caused by the measuring environment, especially the existing methods did not fully explo...

The coastal zone is connected to the hinterland of the basin and the wide sea, which is not only affected by complex natural factors, but also by human activities. The study of sediment classification in this area will help to further explain topographic evolution and dynamic mechanism. Aiming at the complex mixed sediment environment in the ancien...

Only approximately 20% of the global seafloor topography has been finely modeled. The rest either lacks data or its data are not accurate enough to meet practical requirements. On the one hand, the satellite altimeter has the advantages of large-scale and real-time observation. Therefore, it is widely used to measure bathymetry, the core of seafloo...

At present, only approximately 10 % of the global seafloor topography has been finely modeled, and the rest are either lacking in data or not accurate enough to meet practical requirements. On the one hand, satellite altimeter has the advantages of large-scale and real-time observation, thus is widely used in the measurement of bathymetry, the core...

海海床发育着不同尺度的活动性砂体，在大型活动性砂体上常叠加发育着大量小尺度沙波(纹)，分析这些小尺度沙波(纹)有助于揭示活动性砂体的成因机制。但它们的尺度较小，常规分析方法往往将其作为高频噪声滤除，难以对该尺度海底沙波(纹)进行分离量化研究。为了解决这个问题，本文设计并实现了一种基于小波分析的小尺度海底沙波地形分解方法，并以台湾浅滩典型区域的高精度近底原位观测数据为例，实现了小尺度海底沙波地形的分解和定量分析，分解出背景地形、小型沙波和沙波纹(波长小于0.6 m)3种地貌类型。本文提出的小尺度海底沙波地形分解量化方法，可广泛应用于浅海高活动性地貌发育演化和海底边界层沉积动力过程研究，对评估海洋工程的稳定性也具有一定的实用价值。

基于自适应增强算法（AdaBoost）结合极限学习机（ELM）,通过迭代、调整、优化ELM分类器之间的权值,从而构建了具有强鲁棒性、高精度的ELM-AdaBoost强分类器,增强了现有的ELM分类器的稳定性。以珠江口海区侧扫声呐图像为实验数据,对礁石、砂、泥3类典型底质进行分类识别,该方法的平均分类精度超过90%,优于单一ELM分类器的平均分类精度85.95%,也优于LVQ、BP等传统分类器,且在分类所耗时间上也远少于传统分类器。实验结果表明,本文构建的ELM-AdaBoost方法可有效应用于海底声学底质分类,可满足实时底质分类的需求。

Observational analysis has revealed an apparent immobility of giant sand waves on the Taiwan Banks, while sand waves on the eastern Taiwan Banks show distinct dynamics influenced by the underlying larger-scale sand ridge bedforms. In this study, the effects of these sand ridge bedforms on sand wave migration and the local hydrodynamic environment w...

Turbidity currents can be characterized as net-erosive, net-depositional or net-bypassing. Whether a flow is erosive, depositional or bypasses depends on the flow velocity, concentration and size but these can also be impacted by external controls such as the degree of confinement, slope gradient and substrate type and erodibility. Our understandin...

Ground-based GNSS (Global Navigation Satellite System) reference stations lack the capacity to provide data for ocean regions with sufficient spatial-temporal resolution, limiting the detailed study of the equatorial ionization anomaly (EIA). Thus, this study collected kinematic multi-GNSS data on the ionospheric Total Electron Content (TEC) during...

The ability to accurately map the seabed sediments plays an important role in seabed habitat development and stakeholder decision-making. In conventional seabed sediment classification methods, maps of seabed sediment are provided in categorical form (sediment classes). Therefore, the prediction of the sediment compositions in multibeam observation...

The bottom tracking is to confirm the first bottom return signal in each ping to divide the data into the seabed area and the water column area, which is an essential part of side-scan sonar (SSS) data processing. More than that, SSS is usually affected by water flow or suspended solids, resulting in serious noises, which make the bottom tracking m...

For mapping the near-shore seafloor bathymetry, retrieving depth information using multispectral satellite image is highly cost-effective. To effectively detect and characterize the bathymetry variation, accurate and reliable information about the uncertainty of the derived depths is critical. In estimating the uncertainty of the resulted satellite...

Multibeam backscatter strength can be used to characterize seafloor acoustic characteristics, and classify seabed substrate types. Herein, we use acoustic reflectance data to examine the distribution of manganese nodules in deep-sea substrates in a seamount region of the Western Pacific Ocean. Based on the multibeam backscatter strength, the backsc...

Multi-beam echo sounders (MBESs) are characterized by the high resolution and high density of the sounding data. The processing of MBES bathymetry data is of special interest currently in marine surveying. The Combined Uncertainty and Bathymetry Estimator (CUBE) and surface filtering are the main MBES-processing algorithms for outliers. These algor...

Overflows through oceanic gateways govern the exchange of water masses in the world's ocean basins. These exchanges also involve energy, salinity, nutrients, and carbon. As such, the physical features that control overflow can exert a strong influence on regional and global climate. Here, we present the first description of sedimentary processes ge...

Acoustic seabed classification (ASC) is a fast and large-scale seabed sediment survey method. In particular, combining it with an automated classifier can theoretically achieve fast automatic seabed sediment classification. However, owing to the cost of sampling, a lack of labeled data for sediment classification based on seabed acoustic images imp...

This book focuses on the survey technology, post-processing technology, mapping technology and scientific application of the submarine topography and geomorphology in detail.High-resolution submarine geomorphology is a frontier branch of marine geology and marine surveying and mapping, which provides a direct basis to study the seabed surface, to u...

The multi-beam echo sounder (MBES) system is a high-tech product for application to modern marine surveys and is a complex system composed of multiple sensors. This chapter outlines the classification and the principles of an MBES and presents representative instruments and equipment along with marine survey workflows. In the installation, calibrat...

海底峡谷在全球陆缘广泛分布，是浅海沉积物向深海运移的主要通道，对于理解深海浊流触发机制、深海沉积物的搬运模式、深海扇的发育历史和深海油气资源勘探等均具有重要意义。本文基于高分辨率高精度的多波束测深数据，首次对南海东北部海底峡谷体系进行了研究，精细刻画了高屏海底峡谷、澎湖海底峡谷、台湾浅滩南海底峡谷和东沙海底峡谷等4条大型海底峡谷的地貌特征并分析其发育控制因素。海底坡度、构造运动、海山与海丘是影响南海东北部峡谷群走向与特征的重要因素，其中，海底坡度对于峡谷上游多分支与“V”字特征有显著的控制作用；构造运动是控制高屏海底峡谷走向的因素，澎湖海底峡谷的走向则与菲律宾海板块与欧亚板块碰撞有关，东沙海底峡谷的走向则与东沙运动相关，台湾浅滩南海底峡谷上段受NW向断裂构造的控制；海山的阻挡作用造成峡谷局部...

Shallow water multi-beam echo sounders (MBESs) are characterized by their high resolution and high density, and MBES data processing is a hotspot in modern marine surveying. The Combined Uncertainty and Bathymetry Estimator (CUBE) is the mainstream MBES data processing algorithm, although little is known about its core theories and parameters. In t...

Due to the influence of human activity and changes in natural conditions, the Pearl River Estuary (PRE) has emerged as a large-scale area of land subsidence, which represents a serious threat to the quality of human life and sustainable socio-economic development. In response to the problems associated with the lack of man-made targets of tradition...

Current filtering methods of airborne LiDAR bathymetry (ALB) point clouds cannot identify negative anomalies or avoid over-filtering of the data. To overcome these problems, we propose a bidirectional cloth simulation filtering (BCSF) method and verify it using captured data. First, a transfer iterative trend surface is established to eliminate the...

Current filtering methods of airborne LiDAR bathymetry (ALB) point clouds cannot identify negative anomalies or avoid over-filtering of the data. To overcome these problems, we propose a bidirectional cloth simulation filtering (BCSF) method and verify it using captured data. First, a transfer iterative trend surface is established to eliminate the...

Sidescan sonars are increasingly used in underwater search and rescue for drowning victims, wrecks and airplanes. Automatic object classification or detection methods can help a lot in case of long searches, where sonar operators may feel exhausted and therefore miss the possible object. However, most of the existing underwater object detection met...

单波束测深技术在近海及河口水深测量中被广泛应用，但受动态海洋环境的影响，很难有效获取不同时期同一位置的水深数据，这给快速变化的近海地形的准确对比与分析造成很大困难。针对该技术问题，本文提出了一种联合不确定度的多期水深剖面分析方法。通过初始不确定度计算、水深及不确定度传递、卡尔曼滤波更新等步骤构建时序地形剖面，并基于假设检验完成剖面地形演变分析。用两期次河口区单波束数据对算法进行了验证。结果表明，本文方法获取了可与实际地形剖面有效对比的水深剖面，并可对地形骤变区域作出准确评估，对于快速变化的河口水下三角洲尤其是航道区域的演变分析具有实际的应用价值。

An algorithm is described and tested to provide accurate and robust deep-sea seafloor classification based on the backscatter data derived from a multibeam bathymetry system. This article focuses on significant heterogeneity in the deep-sea backscatter strength (BS) data. The angular response curve information is decomposed into different units, an...

Access to reliable and accurate bathymetric data is fundamental to many marine activities. This paper proposes a merge-normalization (MN) method that is suitable for multi-source bathymetric data fusion in deep ocean areas, to solve the problem of difficult to integrate high-precision digital bathymetric model (DBM) for complex sources and various...

The global ionospheric model built by the International Global Navigation Satellite System (GNSS) Service (IGS) using GNSS reference stations all over the world is currently the most widely used ionospheric product on a global scale. Therefore, analysis and evaluation of this ionospheric product’s accuracy and reliability are essential for the prac...

Sand waves are widely distributed in the world and have complex genesis. And multi-scale complex sand waves often overlap to form a complex sand wave geomorphology system, which makes it difficult to conduct quantitative research. To solve this problem, a practical Fourier analysis method is proposed in this paper, and Butterworth filter is designe...

Seabed acoustic images are image data mosaics derived from seafloor acoustic backscattering intensity data, which is related to the type of sediment covering the seabed. Therefore, submarine sediment classification can be realized using seabed acoustic images, and has been studied extensively. Recently, deep learning has also rapidly advanced, in p...

This paper systematically identified the submarine pockmarks in the southern depression of the Reed Basin in the South China Sea for the first time, based on high-resolution multi-beam bathymetric data and sub-bottom profiles. A total of 81 pockmarks have been identified, and the maximum diameter of them reaches almost 2.4 km, and the maximum depth...

CUBE (combined uncertainty and bathymetry estimator) is a widespread algorithm in the world, to automatically detect and process multi-beam sounding outliers. While, little is known about its core algorithms and parameters, which is not good for the localization of this technology. In this paper, the basic principle, mathematical model, key paramet...

In recent years, the sparsity-promoting reconstruction method based on the compressed sensing theory has been rapidly developed and applied to seismic data reconstruction. Many achievements have been made toward providing high-quality reconstruction by using undersampled data. However, the problem of insufficient reconstruction in null traces still...

Airborne light detection and ranging (LiDAR) full waveforms and multibeam echo sounding (MBES) backscatter data contain rich information about seafloor features and are important data sources representing seafloor topography and geomorphology. Currently, to classify seafloor types using MBES, curve features are extracted from backscatter angle resp...

To better solve the problem of target detection in marine environment and to deal with the difficulty of 3D reconstruction of underwater target, a binocular vision-based underwater target detection and 3D reconstruction system is proposed in this paper. Two optical sensors are used as the vision of the system. Firstly, denoising and color restorati...

Based on approximately 11,000 km of seismic reflection data collected across the South China Sea oceanic basin, we describe the sedimentary filling characteristics of the basin since its Oligocene opening, as well as connections between this history and contemporaneous regional tectonic events. The seismic lines are spaced ~50 km apart, and the dat...

Understanding sand wave dynamics is of importance in marine science and also has relevance in engineering. Giant sand wave fields (wave heights up to 10 m) are not common and thus have been relatively rarely studied. This paper presents the first study on bedform changes related to giant sand wave geomorphology on the Taiwan Banks. Using data from...

We use 165 years of navigational and bathymetric data and 60 years of sediment discharge data to document and explain geomorphic changes in the Pearl River Delta (PRD) and its estuary, which in recent years has experienced rapid urbanization and explosive economic growth. A series of British and Chinese navigation charts dating back to 1850 show th...

Environmental uncertainty represents the limiting factor in matched-field localization. Within a Bayesian framework, both the environmental parameters, and the source parameters are considered to be unknown variables. However, including environmental parameters in multiple-source localization greatly increases the complexity and computational deman...

We use 165 years of navigational and bathymetric data and 60 years of sediment discharge data to document and explain geomorphic changes in the Pearl River Delta (PRD) and its estuary, which in recent years has experienced rapid urbanization and explosive economic growth. A series of British and Chinese navigation charts dating back to 1850 show th...

Multibeam echosounder system is a dynamic measurement under the continuous motion of measurement platform. Contaminated sporadic outliers are inevitably generated during bathymetric data acquisition due to the interference of underwater environmental effects, such as ocean waves, wind, and tides. A filtering model of robust multi-quadric method bas...

Abnormal value of the multibeam echosounder system is the main influencing factor of accuracy of hydrographic survey and mapping accuracy of seabed topography. Good functional and stochastic models for multibeam bathymetric data processing are necessary to protect accurate display of multibeam bathymetric data in seabed and safety navigation of shi...

The short-time signal anomaly of Global Positioning System (GPS) often occurs in the process of multi-beam bathymetry, which leads to the poor accuracy of multi-beam acoustic emission of instantaneous position datum and affects the underwater topographic survey accuracy to a large extent. This study proposes a novel method to reconstruct multi-beam...

By combining Particle Swarm Optimization (PSO) with BP neural network, the initial weights and thresholds of BP neural network classification are optimized by utilizing PSO with strong robustness and global searching ability. Extracting six main feature vectors of sandy, rocks and mud in the seabed sonar images based on the data of side scan sonar...

A new method is proposed to identify automatically the foot of the continental slope (FOS) based on the integrated analysis of topographic profiles. Based on the extremum points of the second derivative and the Douglas–Peucker algorithm, it simplifies the topographic profiles, then calculates the second derivative of the original profiles and the D...

Based on multi-beam echo soundings and high-resolution single-channel seismic profiles, linear sand ridges in U14 and U2 on the East China Sea (ECS) shelf are identified and compared in detail. Linear sand ridges in U14 are buried sand ridges, which are 90 m below the seafloor. It is presumed that these buried sand ridges belong to the transgressiv...

Estuaries have been the site of intensive human activities during the past century. The decadal time-scale evolution of subaqueous topography in estuaries enables us to understand the effects of human activities on estuaries. The Pearl River is one of the 25 largest rivers in the world and the third- largest river in China in terms of sediment disc...

Estuaries have been sites of intensive human activities during the past century. Tracing the evolution of subaqueous topography in estuaries on a decadal timescale enables us to understand the effects of human activities on estuaries. Bathymetric data from 1955 to 2010 show that land reclamation decreased the subaqueous area of Lingding Bay, in the...

Based on 4 530 km high resolution seismic data and core data, we divide the sequence stratigraphy in the Taiwan Strait since late Pleistocene, using the method of high resolution seismic stratigraphy. The main reflective interfaces R0,R1,R2,R3 and R4 correspond to the seafloor, the high sea level at 3 ka BP, the maximum flooding surface, the transg...

Real-time observations in the field and numerical simulations (with Delft3D) were combined to study the formation, distribution and the relevant influencing factors of turbidity maximum (TM) in the Zhujiang (Pearl River) Estuary (ZE). The spatial distribution pattern of the TM varies with the longitudinal distributions of salinity and suspended sed...

Lack of accurate multi-beam bathymetric data,publications on meticulous characteristics of sand wave on Taiwan bank are rare. For this reason,the paper presents an approach to objectively analyze large number of sand waves on their meticulous shape characteristics and distribution using multi-beam bathymetric data. The results show that the average...

We applied the maximum offset of sound velocity algorithm to sound velocity profile streamlining and optimization to overcome multi-beam survey and data processing efficiency problems. The impact of sound velocity profile streamlining on sounding data accuracy is evaluated. By automatically optimizing the threshold, the reduction rate of sound velo...

Sand wave is a widely occurring submarine bedform which exists on the sea floor of shallow seas due to the complex interaction between waves, tides and sediments. Knowledge of sand wave characteristics and behavior has scientific import and engineering application value. Crest lines and trough lines are basic topographic characteristics of sand wav...

The invention discloses a multi-beam bathymetric chart construction method based on submarine digital depth model feature extraction. The method comprises the steps of: constructing a DDM (Digital Depth Model) based on raw multi-beam echo soundings; establishing a slope and second derivative composite model based on the DDM; extracting feature poin...

Decreased fluvial water and sediment discharge, increasing land reclamation, changing climate, and rising sea level have had an ever-increasing impact on river deltas, particularly those deltas bordering Southeast Asia. Utilizing 100 years of navigational and bathymetric data, together with more than 50 years of fluvial discharge data, we here docu...

This paper establishes techniques and methods to determine a variety of boundaries associated with 200 nautical miles beyond the continental shelf. The methods, based on topography, slope and second-derivative profile integrated analysis, are now able to identify automatically the foot of the continental slope (FOS). By analyzing the sedimentary pr...

Based on multiple types of data, the topographical features of the Okinawa Trough (OT) have been characterized and a computation method has been proposed to determine the break point of continental shelf (BOS), foot point of the continental slope (FOS), the central axial point, and the maximum depth point. A total of 48 topographical profiles that...

声速剖面(SVP)在多波束测深中不可或缺.为解决原始测量的声速剖面数据量大而影响工作效率的问题,本文进行了声速剖面的精简与优化研究.提出一种适用声速剖面数据精简运算的改进D-P算法,通过射线追踪法和误差百分比分析法评估精简前后的声速剖面对测深精度的影响,并利用实测声速剖面数据对该算法进行了验证.结果表明,通过优选算法阈值,声速剖面数据的简化率在90%以上,可控制水深标准差百分比在0.1%以内,优化后的声速剖面可大幅提升多波束勘测与数据处理工作效率,具有重要的工程实际应用价值.

Segmenting the seafloor sonar gray image,and extracting characteristic vector unit with principal component analysis,the selection of the mean,standard deviation,contrast,correlation coefficient,energy and homogeneity is as training characteristic vector,to build wavelet neural network. Using genetic algorithm to optimize the wavelet neural network...

基于多源数据资料，揭示了冲绳海槽海底地形地貌特征. 提出确定大陆坡折点、大陆坡脚点、中轴点和最深点的计算方法. 通过对48条横穿大陆坡的剖面的计算，确定了东海大陆坡折点及连线、大陆坡脚点及连线：通过对39条横穿冲绳海槽轴部地形剖面的计算和综合分析，确定了冲绳海槽最深点、中轴点及连线. 大陆坡折线是陆架与陆坡的分界线，东海大陆坡折线总体位于200 m水深，在海槽北段至中段连续，在海槽南段跳跃. 大陆坡脚线是陆坡与海槽底部的分界线，其水深自冲绳海槽北向南逐渐加深，南部大陆坡被海底峡谷强烈切割，导致大陆坡脚点分布复杂. 横穿海槽北部、中部和南部的地形剖面分别呈现为W型、复合W型及U型特征，导致中轴点在海槽中部与北部多分布在海山峰及线性海山脊，在南部多分布于雁行洼地中央，由中轴点形成的中轴线是冲绳海...

The foot point of slope (FOS) is the core limits of the continental shelf beyond 200 nautical miles. Methodological and algorithmic research for the identification of the foot point of slope is discussed to improve our independent abilities and maintain our national maritime rights. A quadratic simplified method based on the D-P algorithm and extre...

Based on the Kriging gridding method,4D space-time terrain models of Lingdingyang estuary were constructed for two years of 1990 and 2008 respectively.And then,the Lingyingyang estuary can be divided into 5 regions of Humen region,Qi'ao island region,Lingdingyang shallow shoal region,Lingding waterway region and marginal region of Tonggu waterway,t...

On the basis of the summary of basic characteristics of propagation, the dynamic model of the tectonic evolution in the Southwestern Subbasin (SWSB), South China Sea (SCS), has been established through high resolution multi-beam swatch bathymetry and multi-channel seismic profiles, combined with magnetic anomaly analysis. Spreading propagates from...

A good method was put forward to predict the coastline change based on the grey model GM(1,1) for its ability to seek for good solution with "a little data",combined with the powerful computing matrix with MATLAB easily. In the paper,origins and 28 lateral lines were set up based on coastline data which were extracted from charts of the Lingding Se...

With segmenting the seafloor sonar gray image and extracting characteristic vector unit with principal component analysis,the mean,standard deviation,contrast,correlation coefficients,energy and homogeneity were selected as training characteristic vectors to optimize the Support Vector Machine(SVM) parameters.Using multi-SVM to train the sand,rocks...

Based on the analysis of new high resolution gravity and magnetic data, combined with swath bathymetry, the Cenozoic evolution model of the South China Sea is revised. Two major sea-floor spreading episodes were revealed with different dynamic mechanism, separated by a remarkable tectonic-sedimentary event near 25 Ma. Sea-floor spreading started fi...

The study area of this paper is the slope of Shenhu Area in the northern South China Sea. We interpreted both sub-bottom and single-channel seismic profiles to describe the acoustic characteristic of gas hydrate sediment and to discuss the cause of its formation. We distinguished some abnormal physiognomy and geologic objects that are relative to g...

融合多波束测深等多种数据资料,对东海陆架线状沙脊进行了识别、分区和分类研究,建立了沙脊脊线分布图谱.东海陆架沙脊走向呈正态分布,155°方位角是正态分布的中心点,125°,130°,140°和180°为沙脊走向峰值点.沙脊空间分布表现为中间密集、南北两端稀疏、向东分散分叉、向西密集交汇的特征.根据沙脊走向和空间上的组合关系将沙脊群划分为7个分区,识别并划分了类河口湾沙脊和开阔陆架沙脊.冰期-间冰期旋回所导致的海平面大幅升降是陆架沙脊广泛发育的主因,古长江输送到陆架的丰富沉积物为沙脊形成提供了物源,海底负地形对沙脊走向起到约束作用.基于沙脊空间分布特征、海平面变化和古潮流场的研究结果,将东海陆架沙脊演化分为4大阶段,分别对应14.5kaBP前、12~14,11.5~9.5和9kaBP后.

Based on the integrated results of multiple data types including MBES (Multi-Beam Echo Sounding) and historical topography maps, the LSR (Linear Sand Ridges) on the ECS (East China Sea) shelf are identified, divided into subareas, and classified. The distribution of sand ridge crests is also established. The strikes of the LSR on the ECS shelf fall...

On the basis of the high-resolution single-channel sparker seismic profiles and MBES(multi-beam echo sounding),the LSRs(linear sand ridges) on Stratum U2 and Stratum U14 on the ECS(East China Sea) shelf are identified and contrasted each other,their form ages are different,more than 200 ka.The sand ridges on Stratum U14 which is bellow seafloor 90...