Simplified spatially distributed, coupled soil moisture–groundwater model, evaluated for Flanders (Belgium)

IF 4.7 2区 地球科学 Q1 WATER RESOURCES
Sotirios Moustakas, Patrick Willems
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引用次数: 0

Abstract

Study region

Flanders region of Belgium.

Study focus

In hydrological studies, there is a need for computationally fast, spatially distributed models involving the unsaturated zone soil moisture, groundwater and their interactions, while maintaining good accuracy. This study builds on an approach based on the AquaCrop model for the unsaturated zone and a 2D explicit groundwater flow model. The model’s speed stems from its simplicity, while AquaCrop’s wide use provides a basic database for parameterization.
Capillary rise, often not (explicitly) assessed in distributed models, is considered. For coupling the unsaturated and saturated zones better, the capillary rise algorithm by AquaCrop was modified. Groundwater flow to the rivers is represented combining Darcy’s law and the linear reservoir concept. Surface runoff modelling is modified to better incorporate the effects of urban environments. The model was parameterized using publicly available data (involving minimal calibration) and tested for Flanders.

New hydrological insights for the region

Despite its simplicity, the model often performed acceptably. Its accuracy was generally higher for the degree of saturation in the upper 70 cm of the soil (R=0.90, RMSE=0.14) than the first 10 cm (R=0.68, RMSE=0.17). The groundwater levels for wells with observed depths less than 5 m were simulated better (R=0.82, RMSE=0.72 m) than the deeper ones (R=0.63, RMSE=4.59 m). Capillary rise was found to be a potentially substantial source of water to the crops.
简化的空间分布式土壤水分-地下水耦合模型,在比利时佛兰德斯进行评估
研究地区比利时佛兰德斯地区。研究重点在水文研究中,需要计算速度快、空间分布式的模型,涉及非饱和带土壤水分、地下水及其相互作用,同时保持良好的精度。本研究采用的方法基于 AquaCrop 非饱和带模型和二维显式地下水流模型。该模型的速度源于其简单性,而 AquaCrop 的广泛使用则为参数化提供了基本数据库。为了更好地耦合非饱和区和饱和区,对 AquaCrop 的毛细管上升算法进行了修改。结合达西定律和线性水库概念来表示流向河流的地下水。对地表径流模型进行了修改,以更好地结合城市环境的影响。该模型使用公开数据进行参数化(涉及最少的校准),并在佛兰德斯进行了测试。对于土壤上部 70 厘米的饱和度(R=0.90,RMSE=0.14),其准确性普遍高于前 10 厘米(R=0.68,RMSE=0.17)。观测深度小于 5 米的水井的地下水位模拟结果(R=0.82,RMSE=0.72 米)优于更深的水井(R=0.63,RMSE=4.59 米)。毛细管上升可能是农作物的一个重要水源。
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来源期刊
Journal of Hydrology-Regional Studies
Journal of Hydrology-Regional Studies Earth and Planetary Sciences-Earth and Planetary Sciences (miscellaneous)
CiteScore
6.70
自引率
8.50%
发文量
284
审稿时长
60 days
期刊介绍: Journal of Hydrology: Regional Studies publishes original research papers enhancing the science of hydrology and aiming at region-specific problems, past and future conditions, analysis, review and solutions. The journal particularly welcomes research papers that deliver new insights into region-specific hydrological processes and responses to changing conditions, as well as contributions that incorporate interdisciplinarity and translational science.
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