| 引用本文: | 孙英,周金龙,齐子萱,等.日尺度和小时尺度下干旱区潜水蒸发变化特征及成因[J].灌溉排水学报,2020,(Z2):-. |
| SUN Ying,ZHOU Jinlong,QI Zixuan,et al.日尺度和小时尺度下干旱区潜水蒸发变化特征及成因[J].灌溉排水学报,2020,(Z2):-. |
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| 摘要: |
| 【目的】潜水蒸发是造成干旱区地下水水量损失和土壤盐渍化的重要因素，准确计算潜水蒸发量对水资源评价和生态耗水量至关重要。【方法】基于新疆昌吉地下水均衡试验场2018年8~10月日尺度和小时尺度下砂砾石潜水蒸发量观测数据，综合采用相关性分析、灰色关联度分析、主成分分析和逐步回归分析法，确定日尺度和小时尺度下潜水蒸发量与气象因子间的相关性，查明影响潜水蒸发量的最显著气象因子，建立预测潜水蒸发量的多元线性回归模型。【结果】结果表明0.5 m埋深下，潜水日蒸发量与0 cm处地温、露点温度和10 cm处土壤湿度的相关关系最显著；潜水逐时蒸发量与气温、风速和日照时数的相关关系最显著；日尺度和小时尺度下潜水蒸发量的多元线性回归模型的拟合程度均较好，拟合的决定系数为分别为0.8859和0.9146。【结论】潜水日蒸发量受大气蒸发能力和土壤供水能力的共同影响，潜水逐时蒸发量主要受大气蒸发能力的影响。 |
| 关键词: 潜水蒸发；不同时间尺度；灰色关联度；主成分分析；逐步回归 |
| DOI： |
| 分类号:S152.7 |
| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| Variation Characteristics and Causes of Phreatic Water Evaporation in Arid Area on Daily and Hourly Scales |
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SUN Ying1, ZHOU Jinlong1, QI Zixuan1, SUN Zhenhai2, JI Yanzhen2
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1.College of Water Conservancy and Civil Engineering, Xinjiang Agricultural University;2.Geological Environment Monitoring Station of Changji Prefecture
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| Abstract: |
| 【Objective】 Phreatic water evaporation is an important factor causing groundwater loss and soil salinization in arid areas. Accurate calculation of phreatic water evaporation is crucial to water resources evaluation and ecological water consumption. 【Method】Based on the observed data of phreatic water evaporation of sand and gravel on the daily scale and hourly scale from August to October 2018 in Changji Groundwater Balance Test Station in Xinjiang, the correlation analysis, grey correlation analysis, principal component analysis and stepwise regression analysis were comprehensively adopted to determine the correlation between phreatic water evaporation and meteorological factors on daily and hourly scales, the most significant meteorological factors affecting phreatic water evaporation were found out, and a multiple linear regression model for predicting phreatic water evaporation was established. 【Result】The results showed that the daily evaporation of phreatic water under 0.5m depth has the most significant correlation with ground temperature at 0 cm depth, dew point temperature and soil humidity at 10 cm. The hourly evaporation of phreatic water has the most significant correlation with air temperature, wind speed and sunshine hours. The multiple linear regression models for daily and hourly phreatic water evaporation have good fitting degree, and the fitting decision coefficients are 0.8859 and 0.9146 respectively. 【Conclusion】The daily evaporation of phreatic water is affected by both atmospheric evaporation and soil water supply, the hourly evaporation of phreatic water is mainly affected by atmospheric evaporation. |
| Key words: phreatic water evaporation; different time scales; grey correlation; principal component analysis; stepwise regression |
