Assessing the hydrologic alteration of the Yangtze River using the histogram matching approach

摘要: Hydrologic changes of the Yangtze River, an important river with abundant water resources in China, were investigated using Histogram Matching Approach. Daily streamflow data spanning time interval from 1955 to 2013 was collected Yichang and Datong stations, which monitor hydrologic processes upper lower reach respectively. The Gezhouba Dam, first dam constructed at main stream started operations 1981. 1981 used differentiate pre-dam (1955-1980) post-dam (1981-2013) regimes. regime quantified by Indicators Alteration. overall alteration degree River 31% every indicator ranged 10% 81%. Only 1, 5 26 indicators altered high, moderate low degrees, 30%, 8% 49%. No high detected station. Ten degrees 22 degrees. Significant increases could be observed for low-flow relevant indicators, including monthly flow January-March, annual minimum 3, 7, 30 90-day flows, base index.