Analysis of the contribution of groundwater to evapotranspiration in an arid irrigation district with shallow water table

2016 ◽  
Vol 171 ◽  
pp. 131-141 ◽  
Author(s):  
Zhongyi Liu ◽  
Hang Chen ◽  
Zailin Huo ◽  
Fengxin Wang ◽  
Clinton C. Shock
Keyword(s):  
Shallow Water ◽  
Water Table ◽  
Irrigation District ◽  
Shallow Water Table

The BP Neural Network Model of Soil Water-Salt Dynamic State Analysis

2013 ◽  
Vol 668 ◽  
pp. 928-932
Author(s):  
Yu Guo Qiang ◽  
Mao Sheng Zhang ◽  
Zhan Bin Li
Keyword(s):  
Shallow Water ◽  
Soil Water ◽  
Water Table ◽  
Salt Content ◽  
Growth Period ◽  
Crop Growth ◽  
Irrigation District ◽  
Dynamic State ◽  
Shallow Water Table ◽  
Water Salt

With the survey data of Luohui Canal Irrigation District, Shaanxi, China as the example, we employed the three-layer feed forward BP network modeling method to study the soil water-salt dynamic state under the comprehensive conditions of the irrigation district, and adopted the Additional Momentum Method and Self-adaptive Learning-rate Adjustment Strategy to modify the back propagation algorithm; on this basis, we employed the default-factor testing method to analyze the sensitivity degrees of soil salt content and soil alkalinity to every factor in the input layer. The results show this model has a high accuracy and can characterize effectively the internal relationships between the change of farmland soil water-salt dynamic state at a shallow water table during crop growth period and its influential factors. Soil moisture content, groundwater salt content and groundwater evaporating capacity are main sensitive factors of soil water-salt dynamic state; the factors interact and affect each other, giving rise to a coupling relationship under complex conditions. Combining the above methods can provide a feasible and effective approach to study the law of soil water-salt dynamic state under a shallow water table during crop growth period, which is a supplement to and improvement in conventional research methods for soil water-salt dynamic state.

Shallow Water Table Fluctuations in Relation to Soil Penetration Resistance

Ground Water ◽  
2003 ◽  
Vol 41 (7) ◽  
pp. 964-972 ◽  
Author(s):  
James B. Shanley ◽  
K. Niclas Hjerdt ◽  
Jeffrey J. McDonnell ◽  
Carol Kendall
Keyword(s):  
Shallow Water ◽  
Water Table ◽  
Penetration Resistance ◽  
Shallow Water Table ◽  
Water Table Fluctuations ◽  
Soil Penetration Resistance

Development and application of long-term root zone salt balance model for predicting soil salinity in arid shallow water table area

2019 ◽  
Vol 213 ◽  
pp. 486-498 ◽  
Author(s):  
Guanfang Sun ◽  
Yan Zhu ◽  
Ming Ye ◽  
Jinzhong Yang ◽  
Zhongyi Qu ◽  
...  
Keyword(s):  
Shallow Water ◽  
Water Table ◽  
Soil Salinity ◽  
Root Zone ◽  
Balance Model ◽  
Salt Balance ◽  
Shallow Water Table
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