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A high-precision hydrodynamic model coupled with the hydrological habitat suitability model to reveal estuarine vegetation distribution

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Journal of Hydrodynamics 2022年第3期34卷 451-466页

作者： Qiao-feng Ma Shu-xiu Liang Zhao-chen Sun Wen-hao Hou Xin-yue Hu Rui-jin Zhang State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian116024China School of Marine Science and Environment Engineering Dalian Ocean UniversityDalian116023China Operational Oceanographic Institution Dalian Ocean UniversityDalian116023China

In this paper,based on the finite volume method,a high-precision hydrodynamic model coupled with the habitat suitability model is established,and the computational efficiency of the coupled model is improved by a graphics processing unit(GPU)-accelerated *** coupled model is used to solve the problem of the non-conservation of mass that may be caused by the nearshore hydrodynamic model in the processing of wetting and drying,while avoiding the unphysical high velocities at the wetting and drying *** coupled model is applied to simulate the high-precision hydrodynamic process of the Liao River estuary(LRE)and the hydrological habitat suitability of the estuarine vegetation(Suaeda heteroptera)growing in the *** simulated values of the hydrological variables(the water level,the water depth,the current velocity and direction)are highly consistent with the measured *** root mean square errors(RMSE)of the hydrological variables are 0.10m,0.12m/s and 17.24°,***,the simulated combined suitability index(CSI)distribution of Suaeda heteroptera(***)matches with the distribution of *** obtained from the high-resolution remote sensing satellite images during the same time *** ratio of the simulated weighted usable area(WUA)of *** to the area obtained from the remote sensing satellite images during the same period is 81.9%.This study reveals the phenomenon that the distribution of *** in the LRE is highly correlated with the high-precision hydrodynamic processes,and provides a scientific basis and a valuable reference for the conservation and the restoration of the estuarine vegetation.

关键词： High-precision hydrodynamic model habitat suitability model conversation of mass weighted usable area vegetation distribution

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Construction of habitat suitability models(HSMs) for benthic macroinvertebrate and their applications to instream environmental flows:A case study in Xiangxi River of Three Gorges Reservior region,China

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Progress in Natural Science:Materials International 2009年第3期19卷 359-367页

作者： Fengqing Li a,b, Qinghua Caia,*, Xiaocheng Fu a,b, Jiankang Liu a a State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China b Graduate University of Chinese Academy of Sciences, Beijing 100039, China State Key Laboratory of Freshwater Ecology and Biotechnology Institute of Hydrobiology Chinese Academy of Sciences Wuhan 430072 China Graduate University of Chinese Academy of Sciences Beijing 100039 China

Based on a long-term ecological monitoring, the present study chose the most dominant benthic macroinvertebrate (Baetis spp.) as tar- get organisms in Xiangxi River, built the habitat suitability models (HSMs) for water depth, current velocity and substrate, respectively, which is the first aquatic organisms model for habitat suitability in the Chinese Mainland with a long-term consecutive in situ measurement. In order to protect the biointegrity and function of the river ecosystem, the theory system of instream environmental flow should be cat- egorized into three hierarchies, namely minimum required instream flow (hydrological level), minimum instream environmental flow (bio- species level), and optimum instream environmental flow (ecosystem level). These three hierarchies of instream environmental flow models were then constructed with the hydrological and weighted usable area (WUA) method. The results show that the minimum required instream flow of Xiangxi River calculated by the Tennant method (10% of the mean annual flow) was 0.615 m3 s 1; the minimum instream environmental flow accounted for 19.22% of the mean annual flow (namely 1.182 m3 s 1), which was the damaged river channel flow in the dry season; and 42.91% of the mean annual flow (namely 2.639 m3 s 1) should be viewed as the optimum instream environmental flow in order to protect the health of the river ecosystem, maintain the instream biodiversity, and reduce the impact of small hydropower stations nearby the Xiangxi River. We recommend that the hydrological and biological methods can help establish better instream environmental flow models and design best management practices for use in the small hydropower station project.

关键词： habitat suitability model Weighted usable area Instream environmental flow Benthic macroinvertebrate Xiangxi river Three Gorges reservoir

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