Experimental Study Of Micro Embellish Pipe Infiltration Under The Micro Embellish Irrigation Conditions

Micro irrigation is a new type of high efficient irrigation technology, it usesemipermeable membrane as irrigation water pipe, irrigation water slowly released intothe crop root zone soil by the buried way and uptaked by crop. Due to micro irrigationis one kind of new water saving irrigation technology, the current domestic and foreignresearches on micro embellish irrigation is relatively less. On the basis of systemicconclusion and study the research achievements in domestic and foreign related tomicro irrigation, this paper has conducted some preliminary experiment research aboutmicro embellish tube. The main research content is divided into the following severalaspects: To analysis water percolating capacity change of micro embellish tube underdifferent water head of unit length through the indoor test, and analyze the change ofwater percolating capacity with change length of micro embellish tube. Through theindoor test analysis the development of the moist soil body and the shape of wettingbody in the conditions of different micro pipe buried depth and different soil, andanalysis the changes of the size of the wetting front and soil moisture content in alldirections. Based on the learning and familiar HYDRUS-2D software, using thesoftware to numerical simulate the soil water infiltration at condition of microembellish irrigation, and comparing the simulated values and measured values.We can get the following main conclusions through analysis:1) Micro embellish pipe unit length per unit time water percolating capacity andcumulative water percolating capacity have one linear relationship with water head,micro embellish pipe unit length per unit time water percolating capacity will increasesWith the increase of water head. Under different water head, micro embellish tube permeter water percolating capacity has inversely proportiona relationship with thedistance of water inlet, micro embellish tube water percolating capacity per meterdecreases with the increase of micro embellish tube’s length. Unit length microembellish tube cumulative infiltration rate decreased with the increase of buried depthat the same irrigate time. Unit length micro embellish tube cumulative infiltration ratewith the increase of time is a linear equation.2) The cross section shape of micro embellish wet body is circle as the center ofmicro embellish pipe, and gradual become an irregular oval with the increase of infiltration time. The distance of wetting front transport in all directions meet havebeen function relationship with time. The distance of sandy loam wetting frontinfiltration is greater than the distance of loam wetting front infiltration, and differencevalue in vertical downward direction is biggest. Wet body parties up each pointbetween soil moisture content and distance from the center of micro embellish tubeaccords with quadratic function, soil moisture content decreas with the increase ofdistance.3) Using the Hydrus-2D can better simulate the micro embellish the infiltrationprocess in the soil.