ABSTRACT The need for a detailed investigation of the Vea catchment water balance components cannot be overemphasized due to its accelerated land-cover dynamics and the associated impacts on the hydrological processes. This study assessed the possible consequences of land-use change scenarios (i.e. business as usual, BAU, and afforestation for the year 2025) compared to the 2016 baseline on the Vea catchment’s water balance components using the Soil and Water Assessment Tool (SWAT) model. The data used include daily climate and discharge, soil and land use/land cover maps. The results indicate that the mean annual water yield may increase by 9.1% under the BAU scenario but decrease by 2.7% under the afforestation scenario; actual evapotranspiration would decrease under BAU but increase under afforestation; and groundwater recharge may increase under both scenarios but would be more pronounced under the afforestation scenario. These outcomes highlight the significance of land-cover dynamics in water resource management and planning at the catchment.

中文翻译：

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西非 Vea 流域土地覆盖变化情景下的水平衡分量估计

摘要 由于其加速的土地覆盖动态及其对水文过程的相关影响，对 Vea 集水区水平衡组成部分进行详细调查的必要性再怎么强调也不为过。本研究使用土壤和水评估工具 (SWAT) 模型评估了土地利用变化情景（即 2025 年照常营业、BAU 和植树造林）与 2016 年基线相比，Vea 流域的水平衡组成部分的可能后果. 使用的数据包括日常气候和排放、土壤和土地利用/土地覆盖图。结果表明，BAU情景下年均产水量可能增加9.1%，而在植树造林情景下可能下降2.7%；实际蒸散量在 BAU 下会减少，但在植树造林下会增加；和地下水补给在两种情景下都可能增加，但在植树造林情景下会更加明显。这些结果突出了土地覆盖动态在流域水资源管理和规划中的重要性。