龙川江径流年内分配及变化趋势研究

Study on Change Trend of Annual Runoff Distribution in Longchuan River

河川径流年内分配特征影响水资源开发利用和区域生态环境,它的变化在一定程度上能反映人类活动和气候变化。本文根据龙川江干流主要水文测站1954～2001的月天然径流资料,分析了年内分配不均匀系数、完全调节系数、集中度、集中期和变化幅度等特性及变化趋势。结果表明:小黄瓜园站和楚雄站径流年内分配不均匀系数、完全调节系数都存在减小趋势,2个测站总体变化趋势相近;对比楚雄站和小黄瓜园站不均匀系数和集中度的拟合曲线,可以发现楚雄站年内分配不均匀系数、集中度降低趋势比黄瓜园站明显,同时,径流集中期无明显变化,但楚雄站的径流集中期要略早于黄瓜园站。

Water resources utilization and regional eco-environment are influenced by annual stream-runoff distribution,to some extend,the change of which reflects the human activity and the climate change.In this paper,the index of unevenness,complete adjustment coefficient,runoff-concentration degree,runoff-concentration period and variation were defined and calculated according to gauge records of monthly runoff of Longchuan main hydrologic stations during 1954～2001.The result showed that the unevenness index and complete adjustment coefficient of Xiao Huangguayuan station and Chuxiong station were in negative trend and the changing tendency was quite-similar;compared with the fitting curves,the decreasing tendency of the unevenness index,runoff-concentration degree of Chuxiong station appeared more obvious than that of Xiao Huangguanyuan station;there was no obvious change in runoff-concentration period,which of Chuxiong station came earlier than that of Xiao Huangguayuan station.