| Groundwater dynamic response and sensitivity analysis to the changing environment in the canal-well combined irrigation area |
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| DOI：10.7606/j.issn.1000-7601.2016.05.33 |
| Key Words: jinghui canal irrigation area groundwater level environmental change response path analysis |
| Author Name | Affiliation | | ZHANG Jing-jing | College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China | | WEI Xiao-mei | College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China | | JIANG Ya-nan | College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| This study analyzed variations of characteristics of external environment factors for groundwater system of Jinghui canal irrigation area using the Linear trend analysis and Spearman ranking test. A response model of groundwater dynamic affected by external environment was established based on the BP artificial neural network. The sensitivity of the groundwater dynamic of the irrigation area was analyzed by path analysis. The results showed that precipitation was declined significantly, with a linear slope rate of 2.09 mm·a-1. Evaporation was raised by 0.04 mm·a-1, which was not obvious in over 30 years. Surface irrigation became decreased. Irrigation intake water from canal head went decreased by 41.6% from that in 1990s. Groundwater exploitation and water ratio of channel vs. well were decreased by 39.7% and 33.9%, respectively. Groundwater depth became increased gradually, and groundwater level cumulative was declined by 11.88m in recent 31 years. The simulation and test average relative errors were 4.52% and 2.23%, reaching acceptable levels. The most sensitive environment factor was water ratio of channel vs. well, and the least was precipitation. |
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