Zhengtao Zhu

Beijing University of Chemical Technology

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Wenxin Huai

Wuhan University

Huilin Wang

Peking University First Hospital

Zhonghua Yang

Wuhan University

Da Li

State Key Laboratory of Information Engineering in Surveying Mapping and Remote Sensing

Dongqi Gu

Tianjin University

Dong Huang

Ocean University of China

Aiping Feng

First Institute of Oceanography

Shuolin Li

Columbia University

Yidan Ai

Wuhan University

Zuwei Zhao

Chengdu University

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Wuhan University

Ministry of Natural Resources

First Institute of Oceanography

South China Agricultural University

University of Chinese Academy of Sciences

Ocean University of China

Ministry of Water Resources of the People's Republic of China

Fujian Institute of Oceanography

Ministry of Education of the People's Republic of China

Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)

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Landscape Pattern Changes of Aquatic Vegetation Communities and Their Response to Hydrological Processes in Poyang Lake, China

Water (2024)

Zhengtao Zhu Huilin Wang Zhonghua Yang Wenxin Huai Dong Huang

Hydrology is an important environmental factor for the evolution of wetland landscape patterns. In the past 20 years, Poyang Lake, the largest freshwater lake in China, has experienced significant inundation shrinkage and water level decrease, posing a significant threat to the local vegetation community. To explore the potential relationship between aquatic vegetation and hydrological processes in the recent hydrological situation, in this study, the landscape patterns of aquatic vegetation communities in Poyang Lake were studied using time-series Landsat remote sensing images and a support vector machine classifier. The stepwise regression analysis method was adopted to analyze the relationship between the vegetation area and hydrological factors. The results indicated that the area of submerged and emergent vegetation in the entire lake decreased significantly from 2001 to 2017, whereas the area of moist vegetation showed a remarkably increasing trend. The average distribution elevation of the submerged vegetation increased by 0.06 m per year. The corresponding landscape patterns showed that the degree of fragmentation of aquatic vegetation communities in Poyang Lake increased. Several hydrological factors were selected to quantify the potential impact of water level fluctuations. The correlation analysis results indicated that hydrological conditions during the rising- and high-water periods may be the key factors affecting the area of aquatic vegetation. This study systematically investigated the evolution of vegetation communities in Poyang Lake wetlands over the past two decades, which contributes to the protection and management of this unique ecosystem.

10.3390/w16111482

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Growth-decay model of vegetation based on hydrodynamics and simulation on vegetation evolution in the channel

Ecological Indicators (2020)

Zhengtao Zhu Zhonghua Yang Wenxin Huai Huilin Wang Da Li

Hydrodynamic conditions are important controlling factors in the evolution of vegetation and ecosystems, especially aquatic ecosystems. This study established a conceptual vegetation evolution model to explore the succession law of vegetation patches in the effective area of a channel, including the evolution of vegetation coverage (Ce) and the corresponding longitudinal dispersion coefficient (Ke). 2D shallow-water equations were implemented to calculate flow variables, and the equivalent Manning coefficient was used to reflect the effects caused by vegetation patches. New vegetation emerged in regions where the bed shear stress is lower than the critical bed shear stress, whereas the original vegetation was removed in regions where the bed shear stress is higher than the critical value. Two typical cross-sections and two initial Ce were considered to better understand the succession trend of vegetation patches under different external conditions. The findings showed that Ce and Ke increased to a constant value with increasing simulation duration, whereas a higher critical bed shear stress, defined by the threshold value (TV), was linked to a higher final vegetation coverage (Cf) and final longitudinal dispersion coefficient (Kf). Furthermore, different initial vegetation distributions, including coverage and position, caused little effect on the Cf in the rectangular channel, but the Cf in the parabolic channel was linearly affected by the averaged bed shear stress at the initial patches. The maximum Kf in both channels occurred with regularly distributed initial patches on one side of the bank. The vegetation patches in all scenarios evolved from block-shaped to strip-shaped and finally formed a stable vegetated landscape. This conceptual vegetation evolution model will improve our understanding of the influence of hydrodynamic conditions on the vegetation evolution in aquatic ecosystems.

10.1016/j.ecolind.2020.106857

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Coastal Vulnerability to Erosion Using a Multi-Criteria Index: A Case Study of the Xiamen Coast

Sustainability (2018)

Zhengtao Zhu Feng Cai Shen-Liang Chen Dongqi Gu Aiping Feng

The assessment of coastal vulnerability to erosion is urgently needed due to increasing coastal erosion globally. Based on the coastal characteristics of the Xiamen artificial coastline, which accounts for more than 80% of the coastline in this area, this study provides an integrated approach based on a multi-criteria index. The evaluation index system of the local coastal vulnerability to the erosion of Xiamen includes 12 indexes based on natural (coastal characteristics, coastal forcing), and socio-economic factors (coastal infrastructure, disaster reduction). The spatial differentiation characteristics of the coastal vulnerability to erosion along the Xiamen coast (2018) have been quantitatively assessed with the aid of GIS (Geographic Information System) and RS (Remote Sensing) technology. The results show that the very high vulnerability, high vulnerability, medium vulnerability, low vulnerability and very low vulnerability areas of coastal erosion accounted for 4.6%, 30.5%, 51.6%, 12.5% and 0.8% of the Xiamen coast, respectively. The coastal vulnerability to erosion classes of artificial coasts is significantly higher than those of natural coasts. This difference is mainly controlled by the coastal slope and coastal buffer ability. The results of the evaluation are basically consistent with the present situation. The rationality of the index system and the applicability of the theoretical method are well explained. The evaluation model constructed in this study can be extended to other areas with high ratios of artificial coasts.

Vulnerability

Vulnerability index

Coastal erosion

10.3390/su11010093

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Citations (41)

Numerical simulation of vegetation evolution in compound channels

Environmental Science and Pollution Research (2022)

Xiaofeng Dang Wenxin Huai Zhengtao Zhu

10.1007/s11356-022-22209-3

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A New Well-Balanced Reconstruction Technique for the Numerical Simulation of Shallow Water Flows with Wet/Dry Fronts and Complex Topography

Water (2018)

Zhengtao Zhu Zhonghua Yang Fengpeng Bai Ruidong An

This study develops a new well-balanced scheme for the one-dimensional shallow water system over irregular bed topographies with wet/dry fronts, in a Godunov-type finite volume framework. A new reconstruction technique that includes flooded cells and partially flooded cells and preserves the non-negative values of water depth is proposed. For the wet cell, a modified revised surface gradient method is presented assuming that the bed topography is irregular in the cell. For the case that the cell is partially flooded, this paper proposes a special reconstruction of flow variables that assumes that the bottom function is linear in the cell. The Harten–Lax–van Leer approximate Riemann solver is applied to evaluate the flux at cell faces. The numerical results show good agreement with analytical solutions to a set of test cases and experimental results.

Shallow water equations

Solver

10.3390/w10111661

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Citations (7)

Solute dispersion in wetland flows with bed absorption

Journal of Hydrology (2019)

Huilin Wang Zhengtao Zhu Shuolin Li Wenxin Huai

10.1016/j.jhydrol.2019.124149

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Citations (27)

Sediment transport in the Luanhe River delta: grain size trend analysis