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引用本文:杨威,毛威,杨洋,等.基于MODFLOW的河套灌区井渠结合开采模式研究[J].灌溉排水学报,0,():-.
YANG Wei,MAO Wei,YANG Yang,et al.基于MODFLOW的河套灌区井渠结合开采模式研究[J].灌溉排水学报,0,():-.
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基于MODFLOW的河套灌区井渠结合开采模式研究
杨威, 毛威, 杨洋, 朱焱, 杨金忠
武汉大学
摘要:
【目的】探究河套灌区不同水文地质条件下适宜的井渠结合开采模式。【方法】基于MODFLOW与实测地下水位等资料,建立了灌区三维地下水动态模型并率定、验证,在灌区四个典型灌域分别选取典型井渠结合区,设置了4种井灌区面积和11种渠井结合比,共44种井渠结合开采模式,预测了各模式下地下水埋深变化,以井灌区地下水平均埋深不超过3 m为标准,优选了各灌域适宜的井渠结合开采模式。【结果】①建立的河套灌区三维地下水数值模型充分反映了灌区内实际水位变化特征,可用于井渠结合后地下水埋深预测;②相同井灌区面积和渠井结合比条件下,解放闸、乌兰布和灌域井渠结合井灌区地下水平均埋深最小,永济灌域次之,义长灌域最大,乌兰布和灌域典型井渠结合区的地下水等埋深线最密集,义长灌域次之,永济和解放闸灌域最稀疏;③井灌区面积一定时,井灌区地下水平均埋深随渠井结合比的增大而减小,但减幅随渠井结合比增大有变缓趋势。【结论】由于水文地质条件差异,各灌域适宜井灌区面积和渠井结合比均有所不同,乌兰布和、解放闸、永济、义长灌域井渠结合井灌区面积分别不宜超过12.25 km2、12.25 km2、9 km2、6.25 km2,渠井结合比分别不宜小于2.5、2.5、3.0、3.3。
关键词:  河套灌区;井渠结合;渠井结合比;井灌区;MODFLOW
DOI:
分类号:S273.4
基金项目:国家自然科学基金(No. 51779178)
Study on Well-canal Conjunctive Mining Mode for Hetao Irrigation District based on MODFLOW
YANG Wei, MAO Wei, YANG Yang, ZHU Yan, YANG Jinzhong
Wuhan University
Abstract:
【Objective】Explore the appropriate well-canal conjunctive mining mode under different hydrogeological conditions in Hetao irrigation District. 【Method】A three-dimensional groundwater dynamic model was established, calibrated and verified based on MODFLOW and measured groundwater depths and other datasets. Typical well-canal combination areas were selected in four typical irrigation areas of Hetao Irrigation District, and 4 kinds of well-irrigation areas and 11 kinds of canal-well combination ratio were set up. Then the calibrated model was used to predict the change of groundwater depth under a total of 44 kinds of well-canal conjunctive mining modes. The suitable well-canal conjunctive mining mode in each irrigation area was optimized, according to the standard that the average groundwater depth in the well irrigation area should not exceed 3 m. 【Result】①The established three-dimensional groundwater dynamic model of Hetao Irrigation District fully reflects the variation characteristics of the actual groundwater level, and it can be used to predict the groundwater depth after well-canal combined irrigation. ②Under the condition of the same well irrigation area and canal-well combination ratio, the average groundwater depth in Jiefangzha and Wulanbuhe Irrigation Area is the smallest, followed by Yongji Irrigation Area, and Yichang Irrigation Area is the largest. Isograms of groundwater depth in the typical well-canal combined area of Wulanbuhe Irrigation Area are the densest, followed by Yichang Irrigation Area, and Yongji and Jiefangzha Irrigation Areas are the most sparse. ③When the area of well irrigation area is constant, the average groundwater depth in well irrigation area decreases with the increase of canal-well combination ratio, but the decrease tends to slow down. 【Conclusion】The suitable area of well irrigation area and canal-well combination ratio are different in each irrigation area, because of the difference of hydrogeological conditions. The areas of well irrigation areas in Wulanbuhe, Jiefangzha, Yongji and Yichang should not exceed 12.25 km2, 12.25 km2, 9 km2 and 6.25 km2 respectively, and the ratios of canal to well irrigation area should not exceed 2.5, 2.5, 3.0 and 3.3.
Key words:  Hetao Irrigation District; well-canal combined irrigation; canal-well combination ratio; well irrigation area; MODFLOW