Simulation of Deep Percolation in Fields with Greater Depth of Groundwater

Abstract:

The rules of deep percolation produced by irrigation under maize in the field with greater depth of groundwater are studied. With the maize cultivation in Dalian as an example, 1-D finite element model is built by VADOSE/W using the daily meteorological data in the years with guaranteed rainfall frequency of 75%, 50% and 25% through analyzing the years-long period regional meteorological data. By this model, the field soil water flow in a whole year under the rain-fed, sprinkler irrigation and border irrigation is simulated respectively, and the water balance of 1m-deep root zone is analyzed. The simulation shows that the ratio of deep percolation to the sum of net precipitation and net irrigation water amount is less than 5% under the rain-fed, 5%~9% under the sprinkler irrigation, 7%~13% under the border irrigation respectively. 70%~95% of deep percolation is produced by irrigation and about 13%~28% of net irrigation water amount is lost as deep percolation, as a result, the main reason for deep percolation can be concluded as irrigation in fields.

• Periodical: Applied Mechanics and Materials (Volumes 448-453)
• Pages: 1158-1164
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.448-453.1158
• Online since: October 2013
• Authors: Zhi Da Du*, Long Tan Shao
• Keywords: Deep Percolation, Irrigation, Maize, Numerical Simulation, Water Balance

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