CAJ | 학술논문

基流是枯水期河川径流量的主要补给来源,合理确定基流过程及其演变趋势在水资源、水环境和水安全的管理中都有着重要的意义. 本文选用HYSEP法对长江螺山站1965-2011 年的逐日流量过程进行了基流分割,得到了螺山站基流过程,选用M-K趋势检验法分析了总径流量、基流量及基流指数( BFI )值的年际变化. 结果表明:螺山站多年平均BFI为0 .83;近50年来,年均径流和基流都呈现显著下降趋势;年均降水量和基流指数分别表现出下降和上升趋势,但趋势并不显著;径流年内分配不均,且主要集中在4-9月,基流表现为1-7月份增加,8-12月份减少;BFI年内则呈1-4月下降,10-12月上升的变化趋势;人类活动和上游洞庭湖的调蓄作用可能是影响螺山站基流过程的主要原因.
기류시고수기하천경류량적주요보급래원,합리학정기류과정급기연변추세재수자원、수배경화수안전적관리중도유착중요적의의. 본문선용HYSEP법대장강라산참1965-2011 년적축일류량과정진행료기류분할,득도료라산참기류과정,선용M-K추세검험법분석료총경류량、기류량급기류지수( BFI )치적년제변화. 결과표명:라산참다년평균BFI위0 .83;근50년래,년균경류화기류도정현현저하강추세;년균강수량화기류지수분별표현출하강화상승추세,단추세병불현저;경류년내분배불균,차주요집중재4-9월,기류표현위1-7월빈증가,8-12월빈감소;BFI년내칙정1-4월하강,10-12월상승적변화추세;인류활동화상유동정호적조축작용가능시영향라산참기류과정적주요원인.
Base flow is the main supply source of river runoff in dry season .The reasonable determination of baseflow process and its evolution trend is of great significance in water resources , water environment and water safety management .This paper used HYSEP to perform the base flow separation from 1965 to 2011 for the Luoshan station of Yangtze river , and got the base flow of Luoshan station .It chose M -K ( Mann-Kendall ) analysis method to identify the trend of interannual and annual average runoff , base flow and base flow index distribution .The results indicate that the base flow index is 0 .83 at Luoshan station.During the past 50 years,the runoff and base flow decreased;the yearly average rainfall and BFI value show the falling and rising trend respectively but the trend is not significant;the runoff is uneven in a year and mainly concentrates from April to September .Base flow is increased from January to July and reduced from August to December;BFI decreases from January to April and ascends from October to De-cember .The main reasons that impact the process of base flow at Luoshan station may be the human activ-ities and storage function of upstream of Dongting lake .