摘要
采用三种基于河床地形的河流深潭浅滩识别方法(深泓线线性回归法、横截面对称指数法和局部高程差异法)对长江上游干流30 km长河段的深潭和浅滩进行了定量分析识别,并采用5～7倍河宽间距法对这三种方法的适用性进行了比较。结果显示,识别出的深潭和浅滩总体上较为吻合,少数几个识别结果不一致的位置,可以结合对河床形态的综合分析加以解决。多数情况下,局部高程差异法的识别结果更加准确有效,但同时使用这三种方法能够加深对研究区域的认识并使识别结果得到确证。在长江上游干流江段,采用局部高程差异法(T=1.0Sd)应是最佳的河流深潭浅滩识别方法。
Pool-riffle sequence is the fundamental geomorphological characteristic of meandering streams.Identification of pools and riffles is useful for discussing the relationship between the biological community and physical environment.That is significantly important for enhancing the river management and river ecosystem conservation.Three pool and riffle identification methods based on riverbed topography including regression technique,areal difference asymmetry index method and bed differencing technique（bdt） were conducted in a 30 km reach in the upper Yangtze.And five to seven channel widths spacing method was used to compare the applicability of the three methods.It was indicated that the identified bed forms（pools and riffles） were agreement on general.Few transects with disagreement,the discrepancies can be explained by examining the stream morphology.In most cases,bdt was more effectively;however,using the three methods together provided corroboration of results and strengthened the analysis.In the upper Yangtze River,bdt with T=1.0Sd was the best way to identify pools and riffles.
出处
《淡水渔业》
CSCD
北大核心
2011年第1期3-9,共7页
Freshwater Fisheries
基金
农业部淡水生物多样性保护与利用重点开放实验室开放课题(LFBCU0705),农业部长江上游珍稀特有鱼类国家级自然保护区水生生物及自然环境综合调查项目
水利部公益性行业科研专项(200701029)
关键词
深潭
浅滩
河床地形
长江上游
pool
riffle
riverbed topography
upper Yangtze
