Agricultural Irrigation Effects on Hydrological Processes in the United States Northern High Plains Aquifer Simulated by the Coupled SWAT-MODFLOW System
Agricultural Irrigation Effects on Hydrological Processes in the United States Northern High Plains Aquifer Simulated by the Coupled SWAT-MODFLOW System
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DOI：
10.3390/w14121938
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发表时间：
2022-06
期刊：
影响因子：
3.4
通讯作者：
Sijal Dangol;Xuesong Zhang;Xin‐Zhong Liang;F. Miralles-Wilhelm
中科院分区：
文献类型：
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作者：
Sijal Dangol;Xuesong Zhang;Xin‐Zhong Liang;F. Miralles-Wilhelm
地下水灌溉对农业生产力和当地水资源有重大影响。本研究评估了地下水灌溉方案，SWAT自动灌溉调度的基础上，植物水分胁迫（Auto-Irr），并规定灌溉的基础上，在MODFLOW（井Irr），在美国北方高平原（NHP）含水层耦合SWAT-MODFLOW模型模拟1982-2008年期间。Auto-Irr在模拟整个NHP的地下水灌溉量（将平均偏差从86%降低到−30%）和地下水位（将归一化均方根误差从13.55%降低到12.47%）以及两个站点的径流年际变化（将NSE从0.51，0.51增加到0.55，0.53）方面通常优于Well-Irr。我们还研究了地下水灌溉对水循环的影响。根据Auto-Irr的模拟结果，历史灌溉导致沿着埃尔克霍恩和普拉特河的显著补给。平均在整个NHP，灌溉增加地表径流，蒸散，土壤水分和地下水补给分别为21.3%，4.0%，2.5%和1.5%。灌溉提高了作物水分生产率，玉米提高了近27.2%，大豆提高了23.8%。因此，设计可持续的灌溉方法，以提高作物生产力必须考虑区域景观特征和下游水文后果。
Groundwater use for irrigation has a major influence on agricultural productivity and local water resources. This study evaluated the groundwater irrigation schemes, SWAT auto-irrigation scheduling based on plant water stress (Auto-Irr), and prescribed irrigation based on well pumping rates in MODFLOW (Well-Irr), in the U.S. Northern High Plains (NHP) aquifer using coupled SWAT-MODFLOW model simulations for the period 1982–2008. Auto-Irr generally performed better than Well-Irr in simulating groundwater irrigation volume (reducing the mean bias from 86 to −30%) and groundwater level (reducing the normalized root-mean-square-error from 13.55 to 12.47%) across the NHP, as well as streamflow interannual variations at two stations (increasing NSE from 0.51, 0.51 to 0.55, 0.53). We also examined the effects of groundwater irrigation on the water cycle. Based on simulation results from Auto-Irr, historical irrigation led to significant recharge along the Elkhorn and Platte rivers. On average over the entire NHP, irrigation increased surface runoff, evapotranspiration, soil moisture and groundwater recharge by 21.3%, 4.0%, 2.5% and 1.5%, respectively. Irrigation improved crop water productivity by nearly 27.2% for corn and 23.8% for soybean. Therefore, designing sustainable irrigation practices to enhance crop productivity must consider both regional landscape characteristics and downstream hydrological consequences.