基于MODFLOW模型的河套灌区耕 荒地地下水运移数值模拟与干排盐估算  

Numerical simulation of groundwater transport and dry-drainage salt estimation in cultivated-wasteland system in Hetao irrigation district based on MODFLOW model

作　　者：袁成福 冯绍元[2] 徐英[2] YUAN Chengfu;FENG Shaoyuan;XU Ying(College of Engineering,Jiangxi Agricultural University,Nanchang 330045,China;College of Hydraulic Science and Engineering,Yangzhou University,Yangzhou 225009,China)

机构地区：[1]江西农业大学工学院,南昌330045 [2]扬州大学水利科学与工程学院,江苏扬州225009

出　　处：《扬州大学学报（自然科学版）》2024年第5期1-8,共8页Journal of Yangzhou University：Natural Science Edition

基　　金：“十三五”国家重点研发计划资助项目(2017YFC0403301);水利部公益性行业科研专项经费资助项目(201401007).

摘　　要：为探明内蒙古河套灌区节水实施现状条件下耕地与荒地之间水盐运移与转化规律,利用率定后的MODFLOW模型对研究区耕荒地地下水运移情况进行数值模拟,估算耕地向盐荒地的排盐量,分析-耕荒-地水盐平衡情况。结果表明:2019年和2020年耕地地下水运移至盐荒地的水量分别为2.98×10^(4)和3.08×10^(4)m^(3),耕地地下水运移至盐荒地的盐量分别为40.55和41.86 t;研究区没有人工排水系统的情况下,作物生育期内耕地约14.22%的地下水通过干排水方式运移至盐荒地,约38.68%的盐分运移至盐荒地,模拟期内盐荒地和耕地的年均积盐量分别为41.21和65.35 t。该研究结果可为河套灌区节水控盐和土壤盐碱化防治提供理论依据。In order to find out the law of water and salt migration and transformation between tillage and wasteland under the current situation of water-saving implementation in Hetao irrigation district of Inner Mongolia,the MODFLOW model with fixed utilization rate is used to conduct numerical simulation of groundwater migration between tillage and wasteland in the study area,estimate the amount of salt discharged from arable land to salt wasteland and analyze the water-salt balance between tillage and wasteland.The results showed that the amount of water transported from cultivated land to saline wasteland was 2.98×10^(4)and 3.08×10^(4)m^(3)in 2019 and 2020,respectively.The amount of salt transported from cultivated land to saline wasteland was 40.55 and 41.86 t,respectively.During the crop growth period,about 14.22%of the groundwater in the cultivated land was transported to the saline wasteland by dry drainage,and about 38.68% of the salt was transported to the saline wasteland without artificial drainage system in the study area.During the two-year simulation period,the average annual salt content of salt wasteland and arable land was 41.21 and 65.35 t,respectively.The research results provide theoretical basis for water-saving and salt-controlling and soil salinization prevention in Hetao irrigation district.

关 键 词：河套灌区 耕荒地 地下水盐运移 MODFLOW模型 

分 类 号：TV93[水利工程—水利水电工程]