平原区土壤水资源计算模型研究

依据小尺度水文学原理,提出了基于有效降水量的土壤水资源计算模型,利用水量平衡原理计算土壤水资源量。利用河北省冉庄实验站的资料,计算丰、枯水年的土壤水资源量分别为642.68 mm和415.34 mm,降水对土壤水资源的贡献率分别为85%和76%,凝结水对土壤水资源的贡献率分别为15%和24%,其计算结果与实际情况相符,凝结水在土壤水资源中占重要地位,在计算土壤水资源量时不可忽视。结果表明:基于有效降水量的土壤水资源求解模型,是计算小尺度水文学上土壤水资源量的另一种有效方法,具有良好的适用性。

Calculating model of soil water resources in plain area

The assessment of soil water resources is important to the reasonable exploitation of water resources and the improvement of agricultural water-saving technique in semiarid area.Based on the small-scale hydrology theory and the effective rainfall,a new soil water resources calculating model was put forward,which calculated the soil water resources by water balance principle.According to the data of Ranzhuang experimental station,Hebei Province,calculation was made of the soil water resources' value of high flow year and low flow year with 642.68 mm and 415.34 mm respectively.The proportion of rainfall in soil water resources was 85% and 76% respectively,while the proportion of condensation water was 15% and 24% respectively.The result accorded with the fact.The proportion of condensation water was large and can not be ignored in calculating the quantity of soil water resources.The results show that the calculating model based on the effective rainfall is another valid method to calculate the quantity of soil water resources for small-scale hydrology and has better applicability.