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Effect of Precipitation Variation on Groundwater Buried Depth in Well-irrigated Areas

机译：降水变化对灌溉良好地区地下水埋深的影响

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摘要

Precipitation variation affects the groundwater system in well-irrigated areas. First, it directly affects groundwater recharge and buried depth. Second, it affects crop irrigation, and consequently, also affects buried depth. The direct and indirect effects of precipitation on groundwater buried depth must be elucidated to achieve stable production and promote the rational use and protection of groundwater resources. In this study, Shijiazhuang Plain is selected as the subject. Variations in groundwater buried depth and exploitation are first analysed. Then, the relationship between groundwater buried depth and precipitation, as well as that between precipitation and groundwater irrigation intensity per area, are investigated. Finally, the effect of precipitation on groundwater buried depth is revealed. Results show that the annual mean groundwater buried depth does not change with increasing or decreasing precipitation. As an important source of groundwater recharge, precipitation directly affects groundwater buried depth during a year and affects groundwater buried depth differently during wet, normal, and dry years. Precipitation is an important supplier of crop water requirements. Thus, increased precipitation reduces irrigation intensity requirement per cultivation area. By contrast, irrigation intensity increases with decreasing precipitation. That is, precipitation can affect groundwater buried depth by affecting irrigation intensity per cultivation area, and this effect can be obviously observed from the varying characteristics of irrigation intensity both in different decades as well as in wet, normal, and dry years.
机译：降水变化会影响灌溉良好地区的地下水系统。首先，它直接影响地下水的补给和埋深。其次，它影响农作物灌溉，因此也影响埋深。必须阐明降水对地下水埋深的直接和间接影响，以实现稳定生产并促进合理利用和保护地下水资源。本研究以石家庄平原为研究对象。首先分析地下水埋深和开采的变化。然后，研究了地下水埋深与降水之间的关系，以及降水与单位面积地下水灌溉强度之间的关系。最后，揭示了降水对地下水埋深的影响。结果表明，年平均地下水埋深不会随降水的增加或减少而变化。作为地下水补给的重要来源，一年中的降水直接影响地下水的埋深，而在潮湿，正常和干燥的年份中，降水对地下水埋深的影响不同。降水是作物需水的重要供应商。因此，增加的降水减少了每个耕地的灌溉强度要求。相反，灌溉强度随着降水的减少而增加。就是说，降水可以通过影响每个耕地的灌溉强度来影响地下水的埋深，并且从不同年代，以及湿润，正常和干旱年份的不同灌溉强度特征可以明显地观察到这种影响。

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