利用实测值估算断面泥沙年负荷的方法比较

发布时间：2018-07-15 08:02

【摘要】：主要针对非固定频率采样、水质监测高度集中在汛期的情形,基于河北承德柳河子流域1995-2011年间逐日径流及泥沙含量数据,比较了平均值法、比例法和回归法估算泥沙年负荷的表现,并提出此情况下泥沙年负荷估算流程.研究结果表明,比例法、流量加权平均浓度与时段平均流量之积、以及流量-泥沙浓度相关关系满足一定条件的回归法均可以获得比较理想的结果.比例法在样品量稀疏(采样频率≤30%)的情况下表现更优.基于瞬时流量平均与瞬时浓度平均之积、以及瞬时通量平均的算法对径流量的时均离散项比较敏感,在低采样频率下往往高估时段污染负荷,因而适合于水质数据比较充足情况下的负荷估算.研究结果可为干旱半干旱地区具有脉冲式径流特征的流域泥沙含量监测频率的设置及泥沙年负荷估算方法的选择提供一定依据.
[Abstract]:Based on the daily runoff and sediment content data from 1995 to 2011 in Chengde Liuzi River Basin, Hebei Province, the average method is compared for the case of non-fixed frequency sampling and high concentration of water quality in flood season. The performance of the annual load of sediment is estimated by proportional method and regression method, and the process of estimating the annual load of sediment is put forward in this case. The results show that the proportional method, the product of the weighted average concentration of the discharge and the average flow of the period, and the regression method of the relationship between the discharge and sediment concentration satisfy certain conditions can obtain more satisfactory results. The proportional method is better when the sample size is sparse (sampling frequency 鈮，

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