Trivariate Copula Based Evaluation Model of Water Accessibility
Trivariate Copula Based Evaluation Model of Water Accessibility
复制标题
基于三变量Copula的水可达性评价模型
DOI：
10.1007/s11269-019-02292-x
复制
发表时间：
2019
影响因子：
4.3
通讯作者：
Yu Dong
中科院分区：
文献类型：
--
作者：
Li Fawen;Liu Huifeng;Chen Xu;Yu Dong
水的可及性是对用水户进行用水评估的一个重要因素。水的可及性受到气候和社会经济变化的影响，区域差异明显。因此，了解水的可及性对有效的水管理至关重要。基于每个耗水网格的长度、径流量和视点值，利用三个变量的标准化累积概率分布表征了相应的可达性。利用Copula函数将三个变量的累计概率分布连接起来，构造一个联合分布。采用联合概率分布对各用水网格的水可达性进行表征，构建了网格尺度的水可达性评价模型lrv （length -径流- viewshed）。本文以永定河流域为例，采用LRV模型对流域水可达性进行评价。选取T Copula函数作为联合分布函数，得到永定河流域水可达性的分布格局。该模型得到了各用水网格的水可达性，为精细化水资源管理提供了技术支持。
Water accessibility is an important factor in water use assessments for water users. Water accessibility is affected by climate and socio-economic changes, and notably large regional differences exist. Therefore, understanding water accessibility is essential for effective water management. Based on the length, runoff and viewshed value of each water consumption grid, this paper characterized the corresponding water accessibility using the standardized accumulative probability distribution of the three variables. The Copula function was used to connect the accumulative probability distributions of the three variables and construct a joint distribution. The joint probability distribution was applied to characterize the water accessibility of all of the water consumption grids, and a grid-scale water accessibility evaluation model-LRV (Length-Runoff-Viewshed) was constructed. This paper chose the Yongdinghe River Basin as a case study to evaluate water accessibility using the LRV model. The T Copula function was chosen as the joint distribution function to obtain the water accessibility distribution pattern of the Yongdinghe River Basin. This model obtained the water accessibility of every water consumption grid and provided technical support for refined water resources management.