| 引用本文: | 王 璐,李 升,王友年,等.阿克苏河下游区灌溉入渗补给系数计算及影响因素分析[J].灌溉排水学报,2019,38(11):65-73. |
| ,et al.阿克苏河下游区灌溉入渗补给系数计算及影响因素分析[J].灌溉排水学报,2019,38(11):65-73. |
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| 摘要: |
| 【目的】准确获取阿克苏河下游区灌溉入渗补给系数，对该区灌溉入渗补给系数的影响因素进行分析，为绿洲带高强度人工灌溉模式下地表水地下水转化机理研究，提高研究区地下水数值模拟精度提供基础。【方法】选取阿克苏下游区不同灌溉制度、包气带厚度、土壤结构下代表性点进行野外取样及室内灌溉试验，并结合Hydrus-1d进行包气带水流数值模拟，通过改变灌溉制度、包气带厚度应用Hydrus-1d模型计算该土壤结构下的灌溉入渗补给系数变化。在模型计算结果的基础上，首先分析灌溉制度、包气带厚度与灌溉入渗补给系数的关系；其后重点利用模型计算结合数理统计的方法分析土壤结构中影响灌溉入渗补给系数的主要因素。【结果】研究区内滴灌条件下灌溉入渗补给系数的范围为0.320~0.474；畦灌条件下灌溉入渗补给系数的范围为0.408~0.561，即不同灌溉制度下灌溉入渗补给系数不同；而伴随包气带厚度增大，灌溉入渗补给系数也随之减小；土壤结构对灌溉入渗补给的主要影响因素为土壤渗透系数、土壤体积质量、土壤初始含水率。【结论】根据室内试验结合数值模型计算出不同灌溉制度下的灌溉入渗补给系数变化范围，得出灌溉入渗补给系数的影响因素为灌溉制度、包气带厚度和反映土壤结构的土壤渗透系数、土壤体积质量及土壤初始含水率，为干旱区下游区灌溉入渗补给系数选取及后续研究提供理论依据。 |
| 关键词: Hydrus-1d； 室内灌溉试验； 干旱区下游区； 灌溉入渗补给系数； 灌溉入渗补给系数影响因素 |
| DOI：10.13522/j.cnki.ggps.20190169 |
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| Calculation of Irrigation Infiltration Recharge Coefficient and Analysis of Influencing Factors in the Lower Reaches of Aksu River |
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WANG Lu, LI Sheng, WANG Younian, WANG Xudong
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College of Geology and Mineral Engineering， Xinjiang University， Urumqi 830047， China
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| Abstract: |
| 【Objective】In order to obtain the irrigation infiltration recharge coefficient in the lower reaches of Aksu river and improve the numerical simulation accuracy of groundwater in the study area， the influencing factors of the irrigation infiltration recharge coefficient in this area were analyzed.【Method】In this paper，field sampling and indoor irrigation experiments were carried out by selecting representative points under different irrigation schemes， vadose zone thickness and soil structure in the lower Aksu area，and numerical simulation of vadose zone flow was carried out in combination with Hydrus-1d. Hydrus-1d model was used to calculate irrigation inflow under this soil structure by changing irrigation schemes and vadose zone thickness. Change of seepage recharge coefficient. On the basis of the calculation results of the model，the relationship between irrigation schedule，aeration zone thickness and irrigation infiltration recharge coefficient is analyzed firstly，and then the main factors affecting irrigation infiltration recharge coefficient in soil structure are analyzed with the method of model calculation and mathematical statistics.【Result】The results showed that the irrigation infiltration recharge coefficient ranged from 0.320 to 0.474 under drip irrigation and from 0.408 to 0.590 under border irrigation，i.e. The irrigation infiltration recharge coefficient varied under different irrigation schemes，while the irrigation infiltration recharge coefficient decreased with the increase of aeration zone thickness. The main factors affecting irrigation infiltration recharge are soil permeability coefficient，soil bulk density and initial soil water content.【Conclusion】】According to indoor experiment combined with numerical model to calculate the irrigation infiltration coefficient under different irrigation system range, it is concluded that the influence factors of irrigation infiltration coefficient of irrigation system, the thickness of the vadose zone and reflects soil permeability coefficient of soil structure, soil quality and soil initial moisture content, volume for the downstream area irrigation infiltration coefficient selection in arid areas and provides the theory basis for further research. |
| Key words: Hydrus-1d; indoor irrigation test; irrigation area downstream of arid area; coefficient of recharge from irrigation; influencing factors of irrigation infiltration recharge coefficient |
