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首页> 外文期刊>Journal of hydrology, New Zealand >Modelling groundwater abstraction scenarios using a groundwater-river interaction model of the Upper Motueka River catchment
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Modelling groundwater abstraction scenarios using a groundwater-river interaction model of the Upper Motueka River catchment

机译：使用Motueka上游流域的地下水与河流相互作用模型对地下水提取情景进行建模

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摘要

The effects of various groundwater abstraction scenarios on stream flow and groundwater levels in the Upper Moteuka River catchment have been investigated using a groundwater-river interaction model. The model operated on a daily time step and had two components: a FEFLOW groundwater model to simulate groundwater losses and gains from the river, and a custom-built river model to route river flow and to calculate river water levels using Manning's equation. For the 'base case', the model input included climate and abstraction data for the period 1 July 2001 to 30 June 2003, and the model was calibrated by adjusting hydraulic conductivity and streambed conductance to achieve a good match to observed groundwater levels, river flows and river water levels measured in this same time period. Thereafter the calibrated model was then used to predict groundwater levels, river flows and river water levels for six different scenarios: 1) actual groundwater abstraction at the end of 2008; 2) groundwater abstraction assuming the maximum take specified on each existing water permit; 3) groundwater abstraction assuming additional permitted takes sufficient to allow complete irrigation over all potentially irrigable land; 4) actual groundwater abstraction at the end of 2008 in roughly half of the model area combined with complete irrigation of all potentially irrigable land in the remainder of the model area; and 5) actual groundwater abstraction at the end of 2008 assuming river bed elevations were 0.3 m higher or lower than current elevations. For all scenarios, modelled mean and median river flows during the irrigation season were at most 5% less than for the base case, and differences outside the irrigation season were even smaller. Only the third of the tested scenarios resulted in modelled river flows that may breach minimum flow requirements at some locations. For all scenarios, modelled groundwater levels were no more than 1 m below the base case, with the largest drops occurring at four locations along the margins of the catchment and near pumping centres. The results suggest that a groundwater pumping scheme could incorporate existing and new abstraction while still ensuring that estimated low flow conditions are not breached during the irrigation season, and the scenario modelling results can be used by Tasman District Council for groundwater allocation management.
机译：使用地下水-河流相互作用模型研究了各种地下水开采情景对上莫特卡河流域的水流量和地下水位的影响。该模型按每天的时间步长运行，包含两个部分：一个FEFLOW地下水模型，用于模拟从河流中抽取和损失的地下水;一个定制河流模型，用于路由河流流量并使用Manning方程计算河流水位。对于“基本情况”，模型输入包括2001年7月1日至2003年6月30日期间的气候和抽象数据，并通过调整水力传导率和河床电导率对模型进行了校准，以实现与观测到的地下水位，河流流量的良好匹配。和同一时间段内测得的河水水位。此后，使用校准后的模型预测六种不同情况下的地下水位，河流流量和河流水位：1）2008年底的实际地下水抽取量; 2）假设每个现有水许可证上规定的最大用水量，抽取地下水; 3）假设额外许可下的地下水抽取量足以使所有潜在的可灌溉土地完全灌溉; 4）到2008年底，在模型区域的大约一半中实际抽取地下水，并在模型区域的其余部分完全灌溉所有潜在的可灌溉土地; 5）假定河床标高比当前标高高0.3m或低，则在2008年底实际抽取地下水。在所有情况下，灌溉季节的模拟平均河流量和中位数河流量最多比基本情况少5％，而灌溉季节以外的差异则更小。只有三分之一的测试场景产生了模拟河流流量，可能会在某些位置违反最低流量要求。在所有情况下，模拟的地下水位均不超过基本情况下的1 m，最大的降落发生在集水区边缘和抽水中心附近的四个位置。结果表明，地下水抽取方案可以结合现有和新的抽取方法，同时仍可确保在灌溉季节不违反估算的低流量条件，并且塔斯曼区议会可以将情景模拟结果用于地下水分配管理。

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