Abstract
The soil water resources has special properties, independent of surface water resources and groundwater resources. The relationship between soil water resources and soil water, the concept and characteristics of soil water resources have been analyzed and the model calculating the soil water resources quantity under the natural condition has been put forward based on the principle of water balance principle in this study. The model parameters have been focused on. Firstly, the daily precipitation has been determined based on typical year. Secondly, the surface runoff has been applied on the basis of the hydrological model of runoff yield in excess of infiltration. Thirdly, canopy interception rainfall has been concluded according to canopy interception model. Fourthly, the water quantity of infiltrated out of the assessment layer has been calculated based on the hydrological model of runoff yield at natural storage. The model has been applied to the work of soil water resources assessment of Qingyuan county in Baoding plain and the result has showed that the soil water resources quantity in mean precipitation year is 301.1485 million m3 and its temporal distribution is consistent with the distribution of rainfall of the year.
Highlights
For a region, the surface water, groundwater and soil water constitute the main water body for industrial and domestic, ecological and environmental water demand
About the computing model of soil water resources mainly had two methods: one was water balance method (You and Wang, 1996; Jin and Fang, 2006), the other was the combining of water balance method and numerical method (Shen, 2008)
The above literatures showed that the conception of soil water resources paid no attention to the recharge sources, which could not be separated by the traditional water resources, so the concept of soil water resources should be further defined and the calculating model of soil water resources should be put forward based on the redefined conception
Summary
The surface water, groundwater and soil water constitute the main water body for industrial and domestic, ecological and environmental water demand. Since 1970’s, the concept of soil water resources was put forward by the pre-Sovietunion geographic hydrologists, research work on the concept and calculation model of soil water resources in China have carried out in different views (Shi and Su, 1984; Feng and Wang, 1990; Jin and Zhang, 1999; Wang et al, 2006; You and Wang, 1996; Jin and Fang, 2006). The above literatures showed that the conception of soil water resources paid no attention to the recharge sources, which could not be separated by the traditional water resources (the surface water resources and the groundwater resources), so the concept of soil water resources should be further defined and the calculating model of soil water resources should be put forward based on the redefined conception.
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