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The bedform morphology of Chinese sturgeon spawning sites in the Yangtze River

International Journal of Sediment Research 2013年第3期28卷 421-429页

作者： Yu-jun YI Shang-hong ZHANG Zhao-yin WANG Ministry of Education Key Laboratory of water and sediment Scienc Beijing Normal University State Key Joint Laboratory of Environment Simulation and Pollution Contro Beijing Normal University Renewable Energy School North China Electric Power University State Key Laboratory of Hydroscience and Engineering Department of Hydraulic EngineeringTsinghua University

Quantitative measures of the relationships between channel morphology and the habitat use of Chinese sturgeon(Acipenser sinensis) can help management and regulatory agencies to quantify potential spawning habitats and develop recovery goals in view of the decreasing area of sturgeon spawning *** study determined the specific bedform types at the pool-riffle scale and evaluated the slopes,aspects and bed load gradation composition of Chinese sturgeon spawning areas in the Yangtze River,China.A bedform differencing technique was used to objectively quantify the longitudinal riverbed profile into four distinct pool-riffle units that were independent of *** vertical location of thalweg points within these units was quantified with a riffle proximity *** sturgeon spawning areas were mapped and correlated with the pool-riffle units,slopes and *** results indicate that Chinese sturgeon spawning areas occur primarily in *** majority of Chinese sturgeon spawning occurred at elevations greater than 75%of the difference in elevation between the nearest riffle crest and the pool *** slope of spawning sites was distributed between 0.05 and 6.36,and the average aspects were 219.92 and 207.63,*** bed load is mainly composted of gravel and pebble,sediment diameter concentrated on *** analyses of bedform morphology will assist regional fish managers in quantifying existing and potential Chinese sturgeon spawning habitats and will provide a quantitative framework for evaluating general ecological implications of channel morphology in the Yangtze River.

关键词： Riverbed morphology pool-riffle units Slope Aspect Chinese sturgeon

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