摘要
基于1970-2008年南流江常乐水文站、钦江陆屋水文站月均实测径流、降雨资料,采用年内分配不均匀系数、变差系数、绝对变化比率、年际不均匀系数、距平百分率等指标分析北部湾经济区径流、降雨的年内分配、年际变化特点,采用线性趋势线法、双累积曲线法分析径流、降雨的变化趋势。结果表明,南流江、钦江实测径流量与降雨量年内分配呈单峰型,径流、降雨年内分配不均系数呈上升趋势,径流的多年变化大于降雨,径流量的年际变化均匀度较差。降雨旱涝等级变化波动小,而径流丰枯等级变化波动频繁。实测径流系数呈下降趋势,降雨径流关系存在减小的规律。
Based on the monthly average measured runoff and rainfall data of the Changle Hydrological Station in the Nanliu River and the Luwu Hydrological Station in the Qinjiang River during 1970-2008,the nonuniformity coefficient in annual distribution,coefficient of variation,absolute change rate,nonuniformity coefficient in inter-annual variability and anomaly percent of rainfall and runoff were calculated to analyze the characteristic of annual distribution and inter-annual variability.And the linear tendency,linear method and double accumulative curve are used to analyze the change trend of rainfall and runoff.The results show that the annual distribution curve of rainfall and runoff is single peak curve,and the nonuniformity coefficient in annual distribution of rainfall and runoff is on the rise,the annual change of runoff is bigger than that of rainfall;the inter-annual change evenness of runoff is poor.The grade of drought and waterlog has little change,but the high and low flow cycles in the Nanliu River and theQinjiang River change radically.The measured runoff coefficient shows a downward tendency,and the rain-runoff relationship shows a decline.
出处
《中国农村水利水电》
北大核心
2011年第6期1-3,6,共4页
China Rural Water and Hydropower
基金
广西科技攻关(桂科攻0895004-3-1
桂科攻0992027-2)
广西自然基金(2010GXNSFE013005)
广西环境工程与保护评价重点实验室基金(0701Z006)
关键词
北部湾
降雨径流
年内分配
年际变化
变化趋势
Beibu Gulf
rainfall and runoff
annual distribution
inter-annual variability
change trend
