一种非饱和土表层蒸发过程的预测方法
发布时间：2019-01-14 07:13
【摘要】：探索了一种由土壤基本物性指标、气象数据预测非饱和土表层蒸发过程的方法。通过土壤基本物理性质(颗粒分布、土粒相对密度、干密度)预测出土-水特征曲线(SWCC),进而得到土壤气相对湿度与含水率的关系,采用Penman-Wilson模型预测出了非饱和土表面的蒸发曲线。通过该方法,只需实地采取土样,获取其基本物理性质,由任意时刻土壤的含水率及气象数据就能预测出该时刻土表的蒸发速率。采用自制的自动蒸发测量系统进行浅层土蒸发试验,得到了蒸发曲线,与预测结果进行比较发现预测蒸发过程与实测结果一样皆由临界含水率和风干含水率将其分为3个阶段:稳定阶段、减速阶段和残余阶段,且蒸发量吻合,证明了所提出方法的准确性和实用性,对工程界估计土表蒸发量,确定水流量边界有重要意义。
[Abstract]:A method for predicting the evaporation process of unsaturated soil surface from the basic physical properties of soil and meteorological data was explored. Based on the basic physical properties of soil (particle distribution, soil particle relative density, dry density), the relationship between soil relative humidity and moisture content was obtained by predicting the characteristic curve of soil-water (SWCC),. The evaporation curve of unsaturated soil surface was predicted by Penman-Wilson model. With this method, the evaporation rate of soil surface can be predicted from soil moisture content and meteorological data at any time by taking soil samples in the field and obtaining their basic physical properties. The evaporation curve of shallow soil was obtained by using the self-made automatic evaporation measurement system. Comparing with the predicted results, it is found that the predicted evaporation process is divided into three stages by the critical water content and the air-dried water content as measured results: the stable stage, the deceleration stage and the residual stage, and the evaporation is consistent. The accuracy and practicability of the proposed method are proved to be of great significance for estimating soil surface evaporation and determining the boundary of water flow in engineering circles.
【作者单位】： 三峡大学三峡库区地质灾害教育部重点实验室;中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;
【基金】：国家自然科学基金(No.51178251)
【分类号】：TU43
[Abstract]:A method for predicting the evaporation process of unsaturated soil surface from the basic physical properties of soil and meteorological data was explored. Based on the basic physical properties of soil (particle distribution, soil particle relative density, dry density), the relationship between soil relative humidity and moisture content was obtained by predicting the characteristic curve of soil-water (SWCC),. The evaporation curve of unsaturated soil surface was predicted by Penman-Wilson model. With this method, the evaporation rate of soil surface can be predicted from soil moisture content and meteorological data at any time by taking soil samples in the field and obtaining their basic physical properties. The evaporation curve of shallow soil was obtained by using the self-made automatic evaporation measurement system. Comparing with the predicted results, it is found that the predicted evaporation process is divided into three stages by the critical water content and the air-dried water content as measured results: the stable stage, the deceleration stage and the residual stage, and the evaporation is consistent. The accuracy and practicability of the proposed method are proved to be of great significance for estimating soil surface evaporation and determining the boundary of water flow in engineering circles.
【作者单位】： 三峡大学三峡库区地质灾害教育部重点实验室;中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;
【基金】：国家自然科学基金(No.51178251)
【分类号】：TU43
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