{"title":"Simplified spatially distributed, coupled soil moisture–groundwater model, evaluated for Flanders (Belgium)","authors":"","doi":"10.1016/j.ejrh.2024.102006","DOIUrl":null,"url":null,"abstract":"<div><h3>Study region</h3><div>Flanders region of Belgium.</div></div><div><h3>Study focus</h3><div>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.</div><div>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.</div></div><div><h3>New hydrological insights for the region</h3><div>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.</div></div>","PeriodicalId":48620,"journal":{"name":"Journal of Hydrology-Regional Studies","volume":null,"pages":null},"PeriodicalIF":4.7000,"publicationDate":"2024-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Hydrology-Regional Studies","FirstCategoryId":"89","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2214581824003550","RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"WATER RESOURCES","Score":null,"Total":0}
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.
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.