| Based on theory of soil water dynamics, the foundational equation of soil water unsaturated flow is applied, a mathematical model of soil water infiltration and a mathematical model of soil water redistribution are established, programs of finite difference method with C program language are used to solve the equation. Moreover, varieties of the soil water infiltration and the soil water redistribution are simulates with numerical simulation when something changes. Also, the idea of a new type water-applicating-opener -wing-opener is designed is put forward. Based on calculation , the opener's parameters are ascertained , and tried in the laboratory and in the fields Tests prove that wing-opener can apply a lot of water and it's capability of insert soil is excellence . Wing-opener is able to meet the demands of fight a drought and sowing . Based on the calculation and the results of tries , the widths of several wing-openers are ascertained . This has an assist for the design of opener. |
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