Evaluation of SoilWater Availability (SWA) Based on Hydrological Modelling in Arid and Semi-Arid Areas: A Case Study in Handan City, China
Evaluation of SoilWater Availability (SWA) Based on Hydrological Modelling in Arid and Semi-Arid Areas: A Case Study in Handan City, China
复制标题
基于水文模型的干旱半干旱地区土壤水分有效性（SWA）评价：以中国邯郸市为例
作者：
高学睿
为评价土壤水分时空有效性，提高农业土壤水分利用效率，综合考虑土壤蓄水能力、土壤水分供应与作物需水时空匹配程度以及土壤水分转化利用效率，建立了土壤水分时空有效性评价指标体系。为了定量计算这些指标，介绍了自行开发的水文模型MODCYCLE，并在邯郸市进行了应用。结果表明，MODCYCLE对土壤水文过程的模拟效果较好。实测土壤水分数据与模拟值的比较表明，相对误差在10%以下，相关系数均在0.7以上。评价结果表明，邯郸市不同典型年份的土壤水耗量分布极不均匀。平水年平均SWA为0.71，高于枯水年的0.62和丰水年的0.65。就不同地区而言，东部平原地区的平均土壤水耗普遍高于西部山区。总的来说，改善土壤水环境，促进土壤水资源的可持续发展，特别是对类似地区的旱地农业来说，潜力很大。
To evaluate the spatial and temporal soil water availability (SWA) and improve the soil water use efficiency in agriculture, this study established a new index system for SWA evaluation considering the soil storage capacity, the temporal and spatial matching degree between soil water supply and crop water demand, and the soil water transformation and utilization efficiency. To quantitatively calculate the indexes, a self-developed hydrological model (MODCYCLE) was introduced and applied in Handan City. The results show that MODCYCLE performed well in simulating the soil hydrological processes. A comparison of the observed soil moisture data and the simulated values revealed relative errors below 10% and correlation coefficients all above 0.7. According to the evaluation results, the SWA for different typical years was very unevenly distributed in Handan City. The average SWA in a normal year is 0.71, which is higher than that in dry years at 0.62 and in wet years at 0.65. Regarding different regions, the average SWA was generally much higher in the eastern plain area than that in the western mountainous area. Generally, there is a great potential for improving SWA and further the sustainable development of soil water resource, particularly for dryland farming in similar areas.