【摘要】：主要針對非固定頻率采樣、水質監(jiān)測高度集中在汛期的情形,基于河北承德柳河子流域1995-2011年間逐日徑流及泥沙含量數(shù)據(jù),比較了平均值法、比例法和回歸法估算泥沙年負荷的表現(xiàn),并提出此情況下泥沙年負荷估算流程.研究結果表明,比例法、流量加權平均濃度與時段平均流量之積、以及流量-泥沙濃度相關關系滿足一定條件的回歸法均可以獲得比較理想的結果.比例法在樣品量稀疏(采樣頻率≤30%)的情況下表現(xiàn)更優(yōu).基于瞬時流量平均與瞬時濃度平均之積、以及瞬時通量平均的算法對徑流量的時均離散項比較敏感,在低采樣頻率下往往高估時段污染負荷,因而適合于水質數(shù)據(jù)比較充足情況下的負荷估算.研究結果可為干旱半干旱地區(qū)具有脈沖式徑流特征的流域泥沙含量監(jiān)測頻率的設置及泥沙年負荷估算方法的選擇提供一定依據(jù).
[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，

本文編號：2123404