Climatic Control on Spatial Distribution of Water Storage at the Catchment Scale: A Framework for Unifying Saturation Excess Runoff Models
Climatic Control on Spatial Distribution of Water Storage at the Catchment Scale: A Framework for Unifying Saturation Excess Runoff Models
复制标题
DOI：
10.1029/2021jd036334
复制
发表时间：
2022-05
期刊：
影响因子：
--
通讯作者：
Lili Yao;Dingbao Wang
中科院分区：
文献类型：
--
作者：
Lili Yao;Dingbao Wang
本文旨在从流域尺度的地下水位和蓄水角度，通过虚拟实验研究基于地形的水文模型（TOPMODEL）与可变入渗能力（VIC）模型之间的联系。针对由一系列补给造成的假设流域建立了一个简单的有限差分地下水流模型。以低补给率下的稳态地下水位作为气候下限，高于该值的孔隙空间被视为最大蓄水能力。当地下水位较浅时，如原始TOPMODEL中假设的那样，陆地表面可以很好地代表地下水位，并且底层蓄水分布曲线与最大蓄水量分布曲线相似。当地下水位较深时，气候下限是地下水位的良好代表，并且如 VIC 模型中假设的那样，在非饱和区域上的存储在空间上近似均匀。地下水位和存储分布的系统变化可能为统一 TOPMODEL 和 VIC 模型提供框架。
This paper aims to investigate the connection between TOPography‐based hydrological model (TOPMODEL) and Variable Infiltration Capacity (VIC) model through virtual experiments from the perspective of water table and storage at the catchment scale. A simple finite‐difference groundwater flow model was built for a hypothetical catchment forced by a sequence of recharges. A steady‐state water table under a low recharge rate is used as the climatic lower limit, above which the pore space is considered as the maximum storage capacity. When the water table is shallow, the land surface is a good proxy of the water table as assumed in the original TOPMODEL, and the underlying water storage distribution curve is similar as the maximum storage capacity distribution curve. When the water table is deep, the climatic lower limit is a good proxy of water table, and the storage is approximately spatially uniform over the unsaturated area as assumed in the VIC model. The systematic variation of water table and storage distribution potentially provides a framework for unifying the TOPMODEL and VIC model.