全球人口增长和稀缺资源加剧了土地使用的竞争。尽管已经认识到气候变化的影响,LULC的转换仍然经常被忽视,并威胁到流域水文学。这主要发生在发展中国家,农业是他们粮食安全的关键来源。LULC的转化一直在危害水平衡成分并破坏生态系统。这项研究证明了SWAT在量化LULC变化对古德流域水平衡的影响中的应用。对2003年至2021年的影响进行了量化,分水岭经历了农业和定居点的增加,而森林,灌木丛,湿地下降了。SWAT+模型的基于时间序列的性能表明,与校准和验证期间观察到的模型相比,该模型更加重组,并且能够模拟水流。在这个长期评估中,该模型模拟了56.5%的径流变化,产水量65.2%,横向流量为21.6%,渗滤46.2%,回流76.4%,2003年至2013年ET为0.2%。此外,从2013年到2021年,水平衡的一些属性有所增加,径流量为34.3%,产水量2.3%,ET为4.5%,横向流量为72.6%。然而,由于定居点的增加,通过拦截减少渗透并将降雨转化为径流,渗滤和回流分别减少了45.6%和86.7%,分别。产水量和径流与LULC的变化呈线性关系,影响他们的最敏感的土地利用变化是农业,森林,和定居点。模拟结果表明,在第三次模拟中LULC变化的影响下,水平衡不足。此外,在第二次模拟中,径流表面的增加限制了地下水向土壤的补给量,并减少了回流和渗滤。
Global population growth and scarce resources increase the competition for land use. Despite the fact that the impacts of climate change have been recognized, the conversion of LULC is still often neglected and threatens catchment hydrology. This is mostly seen in the developing world, where agriculture is the crucial source of their food security. The conversion of LULC has been jeopardizing water balance components and damaging ecosystem. This study demonstrates the application of SWAT+ in quantifying the impacts of LULC changes on the Guder catchment water balance. The impacts were quantified between 2003 and 2021, and the watershed experienced an increase in agriculture and settlement while forest, shrubland, and wetlands declined. The time-series-based performance of the SWAT + model shows the model is more restructured and capable of simulating streamflow compared to observed during calibration and validation. In this long-term evaluation, the model simulates changes in runoff of 56.5%, water yield of 65.2%, lateral flow of 21.6%, percolation of 46.2%, return flow of 76.4%, and ET of 0.2% between 2003 and 2013. Moreover, some attributes of the water balance have increased from 2013 to 2021, with runoff of 34.3%, water yield of 2.3%, ET of 4.5%, and lateral flow of 72.6%. However, as a result of increasing settlement, which reduces infiltration through interceptions and converts rainfall to runoff, percolation and return flow were decreased by 45.6% and 86.7%, respectively. Water yield and runoff show a linear relationship with changes in LULC, and the most sensitive land use changes that affect them are agriculture, forest, and settlements. The simulation results show a water balance deficit under the impacts of LULC changes in the third simulation. Furthermore, the increased surface of runoff has been limiting the amount of groundwater recharge into the soil and reducing return flow and percolation in the second simulation.