| Effects of stochastic rainfall on water distribution in coastal saline\|alkali soil |
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| DOI：10.7606/j.issn.1000-7601.2022.04.19 |
| Key Words: stochastic rainfall saline\|alkali soil soil water content total rainfall HYDRUS-1D |
| Author Name | Affiliation | | GUO Aike | Hebei University of Engineering School of Water Conservancy and Hydroelectric Power, Handan, Hebei 056038, China | | WU Haixia | Hebei University of Engineering School of Water Conservancy and Hydroelectric Power, Handan, Hebei 056038, China
Hebei Key Laboratory of Intelligent Water Conservancy, Handan, Hebei 056038, China | | TAO tao | Haihe Water Conservancy Committee Zhanghe Upstream Management Bureau, Handan, Hebei 056038, China | | SONG Furu | Hebei Silicon Valley Fertilizer Co. Ltd., Handan, Hebei 056038, China | | SONG Liqiang | Hebei Silicon Valley Fertilizer Co. Ltd., Handan, Hebei 056038, China | | SONG Juqiang | Hebei Silicon Valley Fertilizer Co. Ltd., Handan, Hebei 056038, China | | WANG Lishu | Hebei University of Engineering School of Water Conservancy and Hydroelectric Power, Handan, Hebei 056038, China
Hebei Key Laboratory of Intelligent Water Conservancy, Handan, Hebei 056038, China | | CHENG Dongjuan | Hebei University of Engineering School of Water Conservancy and Hydroelectric Power, Handan, Hebei 056038, China
Hebei Key Laboratory of Intelligent Water Conservancy, Handan, Hebei 056038, China |
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| Abstract: |
| This study employed the Neyman\|Scott rectangular pulse model to simulate hourly rainfall with the restriction of total rainfall amount, rainfall frequency and extreme rainfall event. The HYDRUS model was performed to disclose the characteristics of soil water. Integrating aforementioned models, we presented a factorial ANOVA method to quantify impacts of total rainfall amount, rainfall frequency and extreme rainfall event on soil moisture movement. Compared with the randomness of rainfall process, the order of influencing factors of rainfall on soil moisture content was total rainfall (A) > rainfall frequency (B) > extreme rainfall (C), and the second\|order interaction between total rainfall and frequency had a significant impact on soil moisture content (P<0.05). When the total amount of rainfall was certain and the number of rainfalls was low (10), the average rainfall intensity was large. Compared with the higher number of rainfall (15 and 20 times), the surface soil moisture content increased by 2.74%~6.23%, while the soil moisture content in the relatively stable layer decreased by 5.66%~15.63%. The difference between random rainfall and uniform rainfall on shallow soil moisture content was relatively small, but with the increase of soil depth, the difference of soil moisture content was increasing under the two rainfall modes. While the total rainfall was 250 mm, the maximum increase of soil water content in the stable layer under the condition of uniform rainfall was 39.52% compared with the random rainfall. Compared with the uniform rainfall process, the random rainfall infiltrated into the stable layer when the total rainfall was small (160 mm and 200 mm). In addition, compared with the influence of total rainfall on soil moisture content, the uncertainty of saturated hydraulic conductivity (θs) of HYDRUS model parameter has a greater impact on soil moisture content. |
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