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Test Study of Water Transport Characteristics and the Effecting Factors of Interference Infiltration under Drip Irrigation

Author: JiangSuYun
Tutor: GuoFengTai；ChengDongJuan
School: Hebei University of Engineering
Course: Agricultural Soil and Water Engineering
Keywords: drip irrigation interference infiltration water transport characteristics influential factors
CLC: S275
Type: Master's thesis
Year: 2011
Downloads: 58
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Abstract


Based on the review and analysis about theory research and related technical literature material of drip irrigation from the home and abroad, this paper uses the technical route including both experiment and theoretical analysis, the main studies are about water infiltration characteristics and influential factors of single-line and bilateral interference infiltration of drip irrigation, the influential factors including antecedent soil moisture content、dripper discharge、interval of plant and soil density. The main research results are as follows:The paper analysis water infiltration characteristics and influential factors about single-line interference infiltration of drip irrigation through experiment at laboratory. The research results indicated: Vertical wetting front advance distance will increase as the infiltration time increase, and the relation between vertical wetting front advance distance and infiltration time accord with power function. In the same infiltration time, vertical wetting front advance distance won’t change too much with interval of plant, vertical wetting front advance distance will increase as dripper discharge and antecedent soil moisture content increase,decrease as interval of plant and soil density increase;The interference infiltration time of horizontal wetting front will be longer as interval of plant and soil density increase, and shorter as dripper discharge and antecedent soil moisture content increase. Before the interference infiltration,horizontal wetting front advanced distance will increase as infiltration time increase and the relation between horizontal wetting front advance distance and infiltration time accord with power function, after the interference infiltration, horizontal wetting front advanced distance won’t change.The research results of soil moisture content distribution of single-line interference infiltration of drip irrigation indicated: Soil moisture content of vertical and horizontal orientation at all the interface will decrease as the distance increase. Contours distribution of soil moisture content show thin after dense, and the point of intersection of vertical and horizontal wetting front as the center. In the same infiltration time, at the same position on soil infiltration profile soil moisture content increase as the dripper discharge and antecedent soil moisture content increase, decrease as interval of plant and soil density increase. To single-line interference infiltration of drip irrigation, soil moisture content at interference interface of the lines is significantly less than the center interface.The paper analysis water infiltration characteristics and influential factors about bilateral interference infiltration of drip irrigation through experiment at laboratory. The research results indicated: Vertical wetting front advance distance at center will increase as infiltration time increase, and the relation between them and infiltration time accord with power function; In the same infiltration time,; After the interference infiltration take place,vertical wetting front advance distance proved trent is consistent to interference interface of plants and lines,wetting front will be close to a line. Before the interference infiltration take place, horizontal wetting front at center interface will increase as infiltration time increase and the relation between horizontal wetting front advance distance and infiltration time accord with power function, after the interference infiltration take place, horizontal wetting front advanced distance at center interface won’t change,and are half of the lines or interval of plant. At the initial, the speed of wetting front advance distance transport will decrease as the time increase. The interference infiltration time of horizontal wetting front advanced distanc of interference interface of lines and plants will increase as dripper discharge and antecedent soil moisture content increase, decrease as soil density increase.The research results of soil moisture content distribution of bilateral interference infiltration of drip irrigation indicated: Soil moisture content of vertical and horizontal orientation at center interface and interference interface will decrease as the distance increase, contours distribution of soil moisture content show thin after dense; At the same position, soil moisture content of vertical and horizontal orientation at center interface、interference interface of the plants and lines will decrease as dripper discharge and antecedent soil moisture content increase, decrease as soil density increase. To bilateral interference infiltration of drip irrigation, soil moisture content at interference interface is significantly less than center interface, interference interface of the plants is significantly less than interference interface of the plants.Above research results on drip irrigation provide scientific proof for developing water infiltration characteristics and guiding reasonable irrigation.

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CLC: > Agricultural Sciences > Agricultural Engineering > Irrigation and water conservancy > Irrigation technology
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