1982—2014年汀江流域长汀段水沙演变规律分析

为掌握气候变化和人类活动干扰条件下汀江流域的水沙演变规律,基于汀江流域长汀段1982—2014年实测水沙资料,运用累积距平法和Morlet小波变换分析了该流域的水沙变化特性。结果表明:径流量和输沙率年内分配都不均匀,径流量主要集中在3—6月份,输沙率主要集中在3—6月份及8月份;径流量和输沙率在1982—2014年的时间序列上发生2次突变,突变拐点为1991年和2000年,1982—1991年为水沙减少的阶段,1992—2000年为水沙增多的阶段,2001—2014年又为水沙减少的阶段;径流量和输沙率在1982—2014年的时间序列上均表现出显著的周期性,径流量的第一主周期为44月,输沙率的第一主周期是18月。研究结果可为汀江流域水资源的合理开发利用和管理提供科学依据。

Evolution of Runoff and Sediment Load in Changting Segment of Tingjiang River Watershed from 1998 to 2014

The characteristics of runoff and sediment evolution in the Tingjiang River watershed under climate change and human activities are analyzed by means of cumulative anomalies and Morlet wavelet analysis based on measured runoff and sediment data in Changting segment from 1982 to 2014.Results indicate that runoff and sediment load distribution are both uneven within the years,with runoff mainly concentrated from March to June while sediment from March to June and in August;runoff and sediment load experienced twice abrupt changes during 1982-2014,once in 1991,and the other in 2000.Runoff and sediment load reduced from 1982 to 1991,and increased in the next 8 years from 1992 to 2000,and then reduced again from 2001 to 2014.The time series of runoff and sediment load during 1982-2014 demonstrated significant cyclicality,with the first principal cycle of runoff and sediment of 44 and 18 months,respectively.