摘要
该文把天然流域概化为多级河网系统，把泥沙在流域中随水流的输移过程概化为在河网中的运动，从而建立了一种新的具有物理基础的流域汇沙计算模型─—逆高斯分布瞬时输沙单位线模型，并提出了模型参数估计等具体计算方法，经黄河中游黄土丘陵沟壑区陕北岔巴沟流域２７场实测输沙率过程资料初步检验，该模型结构合理、精度较高，具有参数少、弹性好、计算简便等显著特点。同时，在参数优选方面，还提出了包括峰现时差因素在内的五种简化多目标函数，取得了明显效果。
The natural basin is simply represented by a multi-order river net system ,so the sediment concentration process in basin can be treated as the transportation in this system. Based on these ratior-nal assumptions, a new sediment graph model-Inverse Gaussian distribution instantaneous unit sedi-ment graph model has been proposed in this paper.Then ,the parameter estimation and other specificcomputational procedure are diseussed.With the verification of 27 events measured in Chabagou basin(in hilly and gully areas of loess plateau,Northern Shaanxi,the results are satisfied and the model hasthe distinguishing features in flexibility ,model structure ,and parameter numbers(only two).At thesame time ,for calibrating parameters efficiently,five kinds of simplified multiple objective functions in-cluding the factor of time difference of peak between meaanred and simulated sediment flux have beenpresented too ,and the good results are achieved.
出处
《水土保持学报》
CSCD
北大核心
1994年第2期48-55,共8页
Journal of Soil and Water Conservation
基金
陕西省自然科学基金
关键词
逆高斯分布
瞬时输沙
单位线
泥沙
Inerse Gausssian distribution sediment flux graph instantaneous unit sediment graph objective function
