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The Experimental Research On Interference Infiltration Characteristic And Influential Factor Of Film Hole Irrigation

Posted on:2003-11-29Degree:MasterType:Thesis
Country:ChinaCandidate:F W LiFull Text:PDF
GTID:2133360062476401Subject:Hydrology and water resources
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The paper is based on analyzing and summarizing the national and international research results of film hole irrigation theory and technique, combined with science and technology tackle key problem item of Shaan'xi, adopts technical way of experiment and theory analysis, studies infiltration characteristic and influential factors of film hole single-line and bilateral interference infiltration and infiltration mathematical models, the main research conclusion are shown as follow:1 .The paper analyzes the infiltration characteristic and influential factors of film hole single-line interference infiltration through experiment at laboratory. The research results indicated that film hole single-line interference infiltration capacity is less than free infiltration's, infiltration volume of film hole single-line interference infiltration will increase as film hole diameter increase, moreover infiltration volume of unit film hole area and interference time will reduce , interference time and infiltration volume under the same time will increase as space of film hole increase, the ability of film hole single-line interference infiltration will increase as soil texture become more coarse, the volume of single-line film hole interference infiltration will reduce as soil density and antecedent soil moisture content increase.The paper propounds four mathematical models of film hole single-line interference infiltration, the calculation precision of four infiltration models are more accurate through the test. Analyzed the relation between the single point source infiltration, vertical infiltration and film hole single-line interference infiltration, so single point source infiltration parameters and film hole single-line interference infiltration parameters can be determined according to vertical infiltration parameters.2.The paper analyzes film hole single-line interference infiltration wetting characteristic and influential factors. The research results indicated that vertical wetting front advance distance of film hole single-line interference infiltration will increase asillfilm hole diameter increase, vertical wetting front advance distance won't change too much with space of film hole, vertical wetting front advance distance will reduce as the soil density and antecedent soil moisture content increase, vertical wetting front advance distance will increase as soil texture become more coarse. Horizontal wetting front pertains to free infiltration phase before interference, its advance law accords with vertical wetting front advance law, horizontal wetting front advance distance won't change with influential factors as film hole infiltration occurs interference.3. Various phase of film hole bilateral interference infiltration accords with power function. Parameter and exponent of film hole bilateral interference infiltration under various phase will increase as film hole diameter increase, parameter of unit film hole area infiltration volume under various phase and interference time will reduce and exponent will increase as film hole diameter increase, interference time and infiltration volume under the same time will increase as space of film hole increase, parameter of film hole bilateral interference infiltration under various phase will reduce and exponent will increase as soil texture become more coarse, parameter will reduce and exponent will increase as soil density and antecedent soil moisture content increase.The paper propounds four mathematical models of film hole bilateral interference infiltration that based on the different known data, the calculation precision of four infiltration models are more accurately through the test.4. The paper analyzes film hole bilateral interference infiltration wetting characteristic and influential factors. The research results indicated that the relation between vertical and horizontal wetting front advance distance of film hole bilateral interference infiltration and infiltration time accord with power function. At central interfac...
Keywords/Search Tags:film hole irrigation, single-line, bilateral, interference infiltration, influential factor, mathematical models
PDF Full Text Request
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