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| DOI：10.13522/j.cnki.ggps.2023186 |
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| Analysis of Dry Discharge Effect of Salt Wasteland Based on HYDRUS-2D |
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GUO Jiawei, ZHOU Hui, SHI Haibin, LI Hongfang
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1. National Field Scientific Observation and Research Station of Grassland Ecohydrology at the Northern Foot of Yinshan Mountain, Inner Mongolia, China Institute of Water Resources and Hydropower Research, Hohhot 010018, China; 2. College of Agronomy,
Inner Mongolia Agricultural University, Hohhot 010019, China; 3. College of Water Conservancy, Civil Engineering,
Inner Mongolia Agricultural University, Hohhot 010018, China
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| Abstract: |
| 【Objective】In order to explore the salt discharge and the required discharge area under the action of dry discharge in the typical area of Hetao Irrigation District, sunflower farmland was selected as the research object. 【Method】The positioning monitoring experiment was carried out for two consecutive years in 2017 and 2018, and two-dimensional saturated-unsaturated soil was established. The numerical model of water and salt migration uses HYDRUS-2D quantitative simulation to simulate the migration and migration range of soil salinity to wasteland under the crop irrigation system. 【Result】The results show that the ratio of the area of the sunflower field to the area of the required salt bearing zone is 1.48-1.53, and the annual salt discharge is 1.98-2.06 t. The analysis further indicates that the extent of the containment area required for the movement of arable land salinity to the wasteland depends to some extent on the area of cultivated land or its proportion of the entire area. 【Conclusion】The simulated values of the model are in good agreement with the measured values, which can better reflect the real situation of the test. The results of this study provide a scientific basis for regulating regional water and salt balance and improvement of salt wasteland. |
| Key words: irrigation; salt wasteland; soil water and salt transport; numerical simulation; HYDRUS-2D model |
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