用水位变化判断冲淤存在的问题  

Judge Existing Problems of Scour and Fill by Using Water Level Variation

作　　者：孙赞盈[1] 曲少军[1] 魏向阳[2] 彭阳[1] 荆新爱[1] 

机构地区：[1]黄河水利科学研究院,河南郑州450003 [2]黄河水利委员会防汛办公室,河南郑州450003

出　　处：《人民黄河》2008年第8期52-53,共2页Yellow River

基　　金：黄河水利科学研究院科技发展基金资助项目(黄科发200604号);“十一五”国家科技支撑计划项目(2006BAB06B08-09)

摘　　要：从非恒定流理论出发论证了定床情形下的水位流量绳套曲线的形成过程,然后论证了动床情形下的水位流量关系,认为:①冲淤是影响水位的一部分原因,而不是全部原因;②洪水期同流量水位抬升,原因是为洪水落水期的流速要远小于涨水期的流速,尽管河槽发生了冲刷,但面积的增加不足以抵消落水期流速减小的影响,从而使水位流量关系曲线呈逆时针绳套曲线;③在推流和整编水文资料时,必须区别对待涨水期和落水期。It proves the formation process of loop rating-curve under immovable bed condition and the stage-discharge relationship under movable bed condition based on the theory of unsteady flow.It deems that a) scour and fill are partial reasons but not the whole to affect water level;b) the increase of co-discharge water level in flood season is because much slower velocity of drop-down period than that of rising period,even the channel is scoured and the increased area can not offset an influence of reduced velocity of drop-down period.Thus,the stage-discharge relationship forms a loop rating-curve of counter-clockwise and;c) it should differentiate rising period and drop-down period while in estimation of discharge and preparation of hydrologic data.

关 键 词：动床 圣维南方程 非恒定流 同流量水位 河道冲淤 

分 类 号：P333[天文地球—水文科学]