| Cite this article: | 米博宇,贾志军,陈皓锐,等.不同节水条件对河套灌区典型灌域水盐动态的影响[J].灌溉排水学报,0,():-. |
| MI Boyu,JIA Zhijun,CHEN Haorui,et al.不同节水条件对河套灌区典型灌域水盐动态的影响[J].灌溉排水学报,0,():-. |
|
| |
|
|
| This article has been：Browse 19Times Download 0Times |
|
|
|
| DOI： |
|
| Impact of Different Water-Saving Conditions on Water and Salt Dynamics in Typical Area of the Hetao Irrigation District |
|
MI Boyu1, JIA Zhijun2, CHEN Haorui1, CHANG Xiaomin1, WANG Huailiang2, WANG Shaoli1, GUAN Xiaoyan1, LIU Yong3
|
|
1.China Institute of Water Resources and Hydropower Research;2.Hebei Research and Promotion Center for Water Resources and Hydraulic Technology;3.Ordos Water Affairs Development Center
|
| Abstract: |
| 【Objective】 To investigate the effects of different water-saving measures and intensities on the water-salt dynamics in a typical area of the Hetao Irrigation District, providing a theoretical basis for precise regulation of water and salt under water-saving conditions.【Methods】A coupled water-salt movement model was developed based on the typical study area of the Shahaoqu sub-district in Hetao Irrigation District. Field data from 2018 and 2019 were used for model calibration and validation. A baseline scenario and six scenarios with different water-saving measures and intensities were established to analyze their impacts on groundwater level dynamics, soil salt accumulation, and crop evapotranspiration.【Results】Scenarios with reduced irrigation quota led to significant groundwater level decline and accelerated salt accumulation. Canal lining scenarios increased salt discharge while saving water. The conjunctive use of wells and canals significantly increased salt accumulation due to irrigation with brackish groundwater. The groundwater level decline showed a significant linear relationship with water-saving intensity, for every 10% increase in water saving (34.5 mm), the groundwater level declined by 0.183 m. The 1 m soil layer was divided into a 0~0.2 m desalination zone, a 0.2~0.4 m transition zone, and a 0.4~1.0 m salt accumulation zone. A quantitative negative correlation existed between groundwater recharge and salt discharge, for every 10 mm increase in groundwater recharge, salt discharge decreased by 33.9 g/m2. Evapotranspiration showed minimal overall changes across all scenarios.【Conclusion】Canal lining is an effective measure to optimize water-salt dynamics in irrigation districts, achieving both water-saving and salt-control benefits. Reduced irrigation quota and conjunctive use of wells and canals would accelerate soil salt accumulation. |
| Key words: Hetao Irrigation District; water-saving; water and salt dynamics; water and salt movement model in irrigation districts |
|
|
|
|
|
|
