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

Micro irrigation is a new type of high efficient irrigation technology, it use semipermeablemembrane as irrigation water pipe, irrigation water slowly released into the crop root zone soil bythe buried way and uptaked by crop. Due to micro irrigation is one kind of new water savingirrigation technology, the current domestic and foreign researches on micro embellish irrigation isrelatively less. On the basis of systemic conclusion and study the research achievements indomestic and foreign related to micro irrigation, this paper has conducted some preliminaryexperiment research about micro reservoir. The main research content is divided into the followingseveral aspects: To analysis water percolating capacity change of micro reservoir under differentwater head through the indoor test, and analyze the change of water percolating capacity with microreservoir. Through the indoor test analysis the development of the moist soil body and the shape ofwetting body in the conditions of different micro pipe buried depth and different soil, and analysisthe changes of the size of the wetting front and soil moisture content in all directions. Based on thelearning and familiar HYDRUS-2D software, using the software to numerical simulate the soilwater infiltration at condition of micro embellish irrigation, and comparing the simulated valuesand measured values.We can get the following main conclusions through analysis:1、Infiltration water and head into a linear relationship between micro reservoir,with the headslightly damp bag per unit time increased, infiltration volumeincreased. Micro run irrigation andother pressure irrigation, water head size is the main driving force of flow. Thus, pressure effects onsoil water infiltration in the following two aspects: one is to increase the pressure head can leadtoinfiltration interface pressure potential increases, the infiltration rate increases;the two is the soilinfiltration interface pressure increases with the increase ofpressure head, infiltrationof soilstructure interface change, lead to the saturated hydraulic conductivity changes.2、Micro reservoir cumulative infiltration water and time into a linear relationship,with thetime increasing, the cumulative infiltration volume of single micro embellishbag also increases.Micro reservoir unit time seepage are basically the same,the seepage volume slightly damp bag is arelated quantity and pressure head.3、Under the different head, slightly damp bag with the seepage water inlet distance is inversely proportional to the connecting pipe, with long growth decreases. Micro reservoirpermeability function relationship between the water inlet distance distance can be used logarithmicfunction fitting, fitting equation is y=aLn (x)+b.4、Depth of micro run bag of cumulative infiltration and infiltration rate has obvious effect. Atthe same time of irrigation, micro run bag of cumulative infiltration and decreases with depth.5、Micro reservoir flow with the burial depth increase and decrease, the reason is slightlydamp bag with increasing depth increase, soil pressure on the holding force of micro moisture bag,resulting in flow resistance increases slightly damp bag, flow decreases.6、Using the Hydrus-2D can better simulate the micro embellish the infiltration process in thesoil.