COMPUTATION OF THE INSTANTANEOUS UNIT-HYDROGRAPH AND IDENTIFIABLE COMPONENT FLOWS WITH APPLICATION TO 2 SMALL UPLAND CATCHMENTS
COMPUTATION OF THE INSTANTANEOUS UNIT-HYDROGRAPH AND IDENTIFIABLE COMPONENT FLOWS WITH APPLICATION TO 2 SMALL UPLAND CATCHMENTS
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DOI：
10.1016/0022-1694(90)90097-h
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发表时间：
1990-09-01
影响因子：
6.4
通讯作者：
WHITEHEAD, PG
中科院分区：
文献类型：
--
作者：
JAKEMAN, AJ;LITTLEWOOD, IG;WHITEHEAD, PG
我们的方法是基于三个因素：（i）总径流响应表示为瞬时单位线与降雨过量的线性卷积：（ii）在离散时间的合理的传递函数关系，其中包括一个有效的和灵活的参数化近似表示;（三）使用参数估计的工具变量法的一个简单的改进版本作为主要工具，以确定代表中可识别的流动分量的数量，并估计其对瞬时单位线的动态贡献。溪流过程线分离是通过将多余降雨量与单位过程线的已确定分量进行卷积来进行的。该程序适用于两个小高地集水区在威尔士[英国]。结果表明，在一个小时的采样间隔，成功的分离快，慢流成分可以实现短时间序列的降雨和径流。
Our approach is based upon three factors: (i) the representation of total streamflow response as a linear convolution of the instantaneous unit hydrograph with rainfall excess: (ii) approximation of this representation in discrete time by a rational transfer function relationship which involves an efficient and flexible parameterisation; (iii) use of a simple refined version of the instrumental variable method of parameter estimation as the major tool to detemine the number of identifiable flow components in the representation and to estimate their dynamic contributions to the instantaneous unit hydrograph. Stream hydrograph separation is undertaken by convoluting rainfall excess with the identified components of the unit hydrograph. The procedure is applied to two small upland catchments in Wales [UK]. The results demonstrate that at sampling intervals of the order of one hour, successful separation of quick and slow flow comoponents can be achieved with short time series of rainfall and streamflow.