A Simple Modelling Framework for Shallow Subsurface Water Storage and Flow
A Simple Modelling Framework for Shallow Subsurface Water Storage and Flow
复制标题
DOI：
10.3390/w11081725
复制
发表时间：
2018-04
期刊：
影响因子：
3.4
通讯作者：
L. Verrot;J. Geris;Lei Gao;X. Peng;Joseph Oyesiku-Blakemore;Jo U. Smith;M. Hodson;Gan‐Lin Zhang;P. Hallett
中科院分区：
文献类型：
--
作者：
L. Verrot;J. Geris;Lei Gao;X. Peng;Joseph Oyesiku-Blakemore;Jo U. Smith;M. Hodson;Gan‐Lin Zhang;P. Hallett
浅层地下水的储存和流动驱动着径流的产生、植被的水分利用和养分循环。在非稳态条件下模拟这些过程是具有挑战性的，特别是在经历极端潮湿和干燥时期的亚热带地区。在流域尺度上，基于物理的方程（例如，理查兹方程）是不切实际的，由于其复杂性，而概念模型通常依赖于稳态假设，没有发现在日常水文动态。我们解决了这一问题，开发一个简单的模型框架浅地下水动态的基础上的物理关系和代理参数的非单位水力梯度引起的通量。我们证明了它的适用性为六个通用的土壤质地和在亚热带中国的一个红壤。结果表明，我们的新方法代表表层土壤日通量和存储更好，一样快，标准的概念方法。此外，它的复杂性较低，比模拟理查兹方程快两个数量级，易于纳入现有的水文模型。
Water storage and flow in shallow subsurface drives runoff generation, vegetation water use and nutrient cycling. Modelling these processes under non-steady state conditions is challenging, particularly in regions like the subtropics that experience extreme wet and dry periods. At the catchment-scale, physically-based equations (e.g., Richards equation) are impractical due to their complexity, while conceptual models typically rely on steady state assumptions not found in daily hydrological dynamics. We addressed this by developing a simple modelling framework for shallow subsurface water dynamics based on physical relationships and a proxy parameter for the fluxes induced by non-unit hydraulic gradients. We demonstrate its applicability for six generic soil textures and for an Acrisol in subtropical China. Results showed that our new approach represents top soil daily fluxes and storage better than, and as fast as, standard conceptual approaches. Moreover, it was less complex and up to two orders of magnitude faster than simulating Richards equation, making it easy to include in existing hydrological models.