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Planning of sustainable agricultural groundwater development in canal areas

机译：规划运河地区的可持续农业地下水开发

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Groundwater development in canal areas, apart from providing subsurface drainage, helps in enhancing the crop areas since the canal supplies are rarely adequate to meet the complete irrigation demands. Sustainability of this crop area enhancement and the associated groundwater development is linked to the requirement of restricting the resulting state variables viz. long-term water table depths and the stream-aquifer interflows within prescribed limits. In the present study, a simulation model is proposed to address this planning problem. The model accepts the crop areas and several other features of the hydro-agronomic system as inputs and computes the maximum water table depth and the stream-aquifer interflows at critical times at the dynamic equilibrium. Under the dynamic equilibrium the excess of annual withdrawals over the annual vertical recharge is compensated by lateral inflows from hydraulically connected drains. As such the total annual inflow and outflow balance each other and the annual time series of head becomes stationary. Therefore dynamic equilibrium represents the annual scenario corresponding to an indefinite sustenance of the cropping/pumping pattern. The proposed strategy is illustrated by applying it to the command of Eastern Yamuna canal system (India) that is experiencing a severe water deficit. Simulation runs are conducted for three cropping patterns representing current scenario, ambitious and conservative patterns.
机译：运河地区的地下水开发，除了提供地下排水之外，还有助于增加作物面积，因为运河的供水很少足以满足全部灌溉需求。这种作物面积增加和相关地下水开发的可持续性与限制所得状态变量的要求有关。长期地下水位深度和规定范围之内的水-水流相互影响。在本研究中，提出了一个仿真模型来解决该计划问题。该模型接受作物面积和水力农艺系统的其他几个特征作为输入，并在动态平衡时计算关键时刻的最大地下水位深度和流水含水流量。在动态平衡下，每年的取水量超过每年的垂直补给量，可以通过液压连接的排污口的横向流入来补偿。这样，总的年度流入和流出量相互平衡，并且压头的年度时间序列变得固定。因此，动态平衡代表与无限期维持耕作/抽水模式相对应的年度情景。通过将其应用于严重缺水的东部亚穆纳运河系统（印度）的命令，可以说明该策略。针对代表当前情景的三种裁剪模式，雄心勃勃的模式和保守的模式进行了模拟运行。

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