粗颗粒悬移质测验误差分析  

Error Analysis of Coarse Suspended Load Measuring

作　　者：韩其为[1] 

机构地区：[1]中国水利水电科学研究院,北京100044

出　　处：《水文》2008年第1期1-6,20,共7页Journal of China Hydrology

基　　金：国家自然科学基金黄河研究联合基金重点项目(50439020)

摘　　要：本文根据流速与含沙量分布,研究了悬移质积点法对粗颗粒含沙量测验误差。首先指出无论从输沙率还是从悬浮高度看,粗颗粒悬移质集中于河底,致使水文测验中的一些测验方法(如一点法、二点法、三点法等)带有较大的误差。进而分析了各种测法对粗颗粒的相对误差,并且随着颗粒变粗,误差愈来愈大,以致不能接受。这种情况在水库下游河道冲刷过程中,会在一定程度上出现,必须重视研究和调整测验方法。最后通过与长江委水文局在沙市及监利两水文站试验结果对比,证明本文理论上的分析是可信的。This paper analyzed the error of coarse sediment concentration measuring in suspended load integrating method, according to velocity and distribution of sediment concentration. It was considered that the coarse suspended loads would be concentrated on the river bottom in view of sediment discharge or suspending height, which would lead to error of some measuring methods. The relative errors of various coarse grain measuring methods were also analyzed. The results show that the error will be bigger and bigger to inacceptable along with the particles getting coarser, which will appear during scouring in the lower reaches of reservoirs. For this reason, the concerned study should be made and the measuring methods should be regulated. It is proved that the con- clusion is credible in theory by contrasting the experiment results from the hydrometric stations of Shashi and Linli.

关 键 词：悬移质 粗颗粒 测验 误差 分析 

分 类 号：P333.4[天文地球—水文科学]