Dong Zhang

There is a need for accurate estimates of extreme sea levels for use in coastal engineering during typhoon seasons. Therefore, a numerical study was carried out to investigate tide–surge interactions induced by Typhoon Mangkhut in the Pearl River Estuary. A nested model was first validated and then used to study the spatial and temporal behavior of...

A numerical study based on FVCOM model was carried out to investigate the storm surge behavior induced by Typhoon Mangkhut in and around Lingdingyang Bay, Pearl River Estuary. Through elaborate calibration, the simulation results matched well with the measurements on the tidal-gauge stations. The validated Typhoon Mangkhut simulation was used as a...

The Humen Estuary, one of the largest outlets of the Pearl River, is a long and wide tidal channel with a considerable tidal flow every year. Storm surges, always superposing spring tide, travel from the estuary and endanger the safety of people living around the river. However, little research has quantified the relationship between the hydraulic...

A high-resolution Finite-Volume Coastal Ocean Model (FVCOM) inundation model has been developed for Dartmouth Town near Apponagansett Bay and Clarks Cove. Series of modeling experiments were conducted for the purpose of: (1) Assess the potential impacts of the climate-induced Sea Level Rise (SLR) on the storm-induced coastal inundation in Dartmouth...

This correction contains three amendments.

Based on the theory of ecosystem health, ten representative indicators are selected from three subsystems of resources, environment, landscape ecology, and human activities according to vitality, organizational power, and resilience, to construct an ecosystem health evaluation index system of coastal zones using remote sensing technology. Here, we...

Based on Prandtl's mixing-length theory, this study proposes new theoretical formulae of velocity profiles resulting from the forcing by a constant horizontal buoyancy gradient in unstratified and stably stratified flows. Based on the one-dimensional water column momentum equation, the vertical turbulent shearing stress profile is found to deviate...

In most TVD schemes, the r-factors were proposed according to the cell-centered (CC) finite volume method (FVM) framework for the numerical approximation to the convective term. However, it is questionable whether those r-factors would be appropriate and effective for the vertex-centered (VC) FVM. In the paper, we collected five kinds of r-factor f...

In most cases, the velocity profiles of tidal currents are expressed by the classical logarithmic (log) law, through which various important friction parameters, such as the friction velocity and roughness length, can be obtained conveniently. However, the power law is not used as much as the log law in tidal current surveys because of the difficul...

Sediment type of muddy intertidal flats was an important surface parameter and understanding of its distribution is capable of benefiting environmental protection as well as engineering management. Remote sensing has been widely used for mapping intertidal surfaces. However, the spectral signal of sediment is easily concealed by water. In order to...

Remote sensing has been widely applied for soil moisture estimation. However, such estimates become difficult to obtain and can be inaccurate when applied to complex earth surfaces with more than one soil type because of the interference of spectral signals from different soil components. This study aims to develop a moisture prediction method that...

Harmful algal blooms commonly known as red tides have been observed at increasing frequencies, which are causing serious economic and ecologic problems in Haizhou Bay off the eastern coast of China. It is important to study the inducing factors of red tides including a wide variety of environmental variables and the complex interactions between the...

Hyperspectral imagery offers an effective way to automatically mapping of surface sediment types in the intertidal flat. The objective of this study is to determine the possibility of mapping sediment types in the southern Sheyang River mouth, Jiangsu Province from Hyperion satellite data with linear spectral unmixing method. Results indicate that...

Choosing dissolved inorganic nitrogen (DIN) as one of the representative nutritional salt monitoring indexes, a hyperspectral remotely sensed inversion model was built and applied to quantitatively retrieve water quality parameters with its spatial distribution patterns in coastal estuary with high suspended sediment concentration (SSC). It was fou...

It is important to map dissolved inorganic nitrogen (DIN) concentrations in order to accurately predict the outbreak of red tides. This study aims to determine the feasibility of retrieving DIN in Haizhou Bay, East China from multi-temporal MODIS satellite data and to assess the impact of DIN concentration level on its inversion accuracy. DIN was m...

The factors sensitive to suspended sediment concentration (SSC) with both strong correlation and evident physical meaning are found step by step with the data collected from Sheyang River estuary. These factors combined by reflectance of 605 nm, 715 nm and 810 nm which near the reflectance peaks of turbid water have strong correlations with SSC. Th...

Among totally 242 spectral bands ranging from 400 to 2500 nm of Hyperion hyperspectral remote sensing data, it was found that two bands with reflectance of 1215 and 2133 nm had relatively good correlation with sediment grain-size parameters of mean diameter(Mz), skewness(Sk), medium diameter(Md) and sorting coefficient(So). And further more, the co...

Sediment type was one of the most important parameters of intertidal zone. The hydrodynamics and morphological changes could be indicated by sediment types very well, and the understanding of their distribution and stability could provide an important insight into littoral marine ecology. The way of conventional survey for sediment types was expens...

Quantitative analysis of the temporal and spatial distribution characteristics of coastal nutrient substances enables to adequately estimate the state of coastal marine environment and describe environmental change processes conditioned by anthropogenic forces. Remote sensing has the potential to provide synoptic information and has been somewhat s...

Accurate atmospheric correction is an important and essential process in ocean color remote sensing because the influence of atmosphere account for the main part of signals received by sensors. Traditional methods usually depend on in-situ measured parameters of atmosphere and could not be applied in operational system. In this paper, MODIS product...

Mapping surface sediment types is particularly challenging in muddy intertidal flat area due to muddy characteristics and tidal fluctuation. With the combination of Hyperion hyperspectral image and field survey data, two regression based image interpretation methods, namely characteristic band method (CBM) and band differential method (BDM), were u...

With the advantage of image-spectrum integration and quantitative analysis, space-borne hyperspectral remote sensing technique was increasingly applied in ground object identification and information extraction at coastal region to solve the difficulty for field observation and sampling. In order to deeply excavate the embedded spectral information...

Red tides have been increasingly observed in the gulf of Haizhou and considered a serious environmental problem from the beginning of the new century. Eutrophication of water is an important reason of red tide occurrence. This paper used the observation data of the concentration of dissolved inorganic nitrogen (DIN) and dissolved inorganic phosphor...

Detecting the morphologic change of intertidal shoals from satellite images is severely hampered by the requirement that they be acquired at the same tidal height. This limitation is circumvented with a new detection method proposed in this paper. It is based on the median line of tidal channels from which the stability of adjoining intertidal shoa...

The objective of this study is to improve and modify the evapotranspiration module designed with Penman-Monteith (PM) approach embedded in SWAT2000 distributed hydrological model so as to improve the precision of evapotranspiration (ET) estimation in hydrological process simulation. For PM approach in SWAT2000 ET0 simulation, some of its daily para...

Water yielding in the hydrologic cycle is a temporally and spatially varied process. However, water yielding mechanics expressed in hydrological simulations seldom accurately characterize such dynamic processes thus weakens the simulation capabilities of present hydrological modeling systems. In this study a conceptual distributed hydrological mode...

The purpose is to explore the effect of the spatial distribution of ground control points (GCPs) on the accuracy of imagery rectification. Both area-distributed and linearly distributed GCPs were used to rectify a Landsat TM image of a coastal zone. Rectification accuracy was checked against 99 independent points over the intertidal mudflats with n...

First Page of the Article

Abstract :Five different evapotranspiration ( ET0 ) estimation methods, namely :Penman-Monteith ( PM) , Pristley-Taylor ( PT) , Hargreaves, FAO Penman-Monteith ( FAO PM) and De Bruin, have been used to evaluate the validity and precision of simulated ET0 results with the observed meteorological data from 13 weather stations in upper Hanjiang basin...

Abstract :Natural disasters such as landslide and soil erosion are severe in China .Therefore , effective evaluation of slope stability further provides the warning for local/ regional soil erosion , which is essential to the precise prediction and effective prevention of these catastrophes .Many approaches have been proposed in assessing slope sta...

Abstract :SWAT (Soil and Water Assessment Tool )model is an advanced , physically based , distributed hydrological model that is integrated with Remote Sensing (RS ), Geographic Information System (GIS )and Digital Elevation Model (DEM )techniques. In order to impel its application study in China and improve the simulation precision of the model in...

Quantitative analysis of the temporal and spatial distribution characteristics of coastal nutrient substances enables to adequately estimate the state of coastal marine environment and describe environmental change processes conditioned by anthropogenic forces. Remote sensing has the potential to provide synoptic information and has been somewhat s...