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Field Experiment on Uniformity of Irrigation Water Distribution under Different Scale

Author: ZhaoDongBin
Tutor: ZuoFeng
School: Hebei University of Engineering
Course: Agricultural Soil and Water Engineering
Keywords: point source drip irrigation line source mulched drip irrigation sprinkler soil moisture distribution irrigation water uniformity
CLC: S152.7
Type: Master's thesis
Year: 2011
Downloads: 70
Quote: 0
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Abstract


Irrigation uniformity is the uniform degrees of irrigation water distribution in the irrigated field, which is an important index to estimate an irrigation projects or an irrigation technology, and directly reflects the degree of irrigation water suffice for crops. It has a signification meaning on a reasonable design and running irrigation system. Combined theoretical analysis with experimental methods, irrigation water distribution was studied under the different scale, such as point source drip irrigation, line source mulched drip irrigation, and sprinkler irrigation. Relationships of the uniformity of irrigation distribution were analyzed under point, line and plane. Such achieve effective combination of the points, lines, planes and body, will improve suitable irrigation uniformities. The main conclusions are listed as follows:(1) Soil water distribution uniformity of point source of surface drip irrigation relates to the emitter discharge and the irrigation quantity, irrigation uniformity increases with the increasing of emitter discharge and the irrigation quantity. Relations of surface soil wetting radius and infiltration time of point source surface irrigation fit well with power function.(2) Under the conditions of line source mulched drip irrigation, when the emitter flow rate is small, the distribution of soil water is relatively uniform. Measured soil moisture distribution of several experiments drip line were higher than 70%, and when the emitter flow rate of 1.2 L/h, the soil water distribution uniformity was the highest, about 90% or more, for local agriculture production use.(3) Single spray nozzle, spray water was obvious saddle; combination spray nozzle, water distribution uniformity of a square layout was better than two-nozzle and three nozzle arrangement.(4) By the field irrigation trials, when the uniformity of sprinkler was only 57.1%, the infiltration soil water distribution uniformity was more than 90% by the re-distribution, indicating that the irrigation water distribution in soil was more uniform than that of spray nozzle spraying.(5) Soil water distribution uniformity of point source sprinkler irrigation is consistent with non-point source sprinkler. So the soil moisture distribution of non-point source sprinkler could be derived from the theoretical point source sprinkler distribution. And it could be gradually expanded from a point to surface, to a larger non-point source.

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CLC: > Agricultural Sciences > Agriculture as the foundation of science > Soil > Soil physics > Soil moisture
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