摘要
为揭示黄土高原北部淤地坝区域土壤水分变化特征及其有效性,以黄土高原北部六道沟流域的一处淤地坝区域为研究区,基于实测的水文、气象数据,利用Penman公式和Penman-Monteith公式分别推求参考作物的蒸散发以及草地蒸散发,并对水分有效性进行评估;基于非饱和土壤水分运动方程式(Richards formula)构建了一维土壤水分计算模型,并对土壤水分进行模拟。结果表明:计算时段内,研究区的水分有效性参数值受同期表层土壤含水量和蒸散发的影响较大;淤地坝区域的水分有效性参数均值(0.31)比坡面均值(0.17)大;构建的一维土壤水分模型模拟精度较高,实测值与模拟值之间的相关系数以及模型的纳什效率(Nash-Sutcliffe efficiency(NSE))系数在0.90以上。研究结果可为黄土高原北部淤地坝区域蒸散发和土壤水分运动的深入研究提供基础数据和方法上的借鉴。
In order to reveal the variation characteristics of soil water and its availability of check dam ar- ea in the northern loess plateau, the paper took a check dam area which located at the Liudaogou basin of northern loess plateau, and based on the measured data of hydrology and meteorology to get the evapo- transpiration （ ET ） of grassland and the reference crop evapotranspiration （ ETo ） by use of Penman e- quation and Penman Monteith equation, and evaluated water availability. Moisture availability was as- sessed based on the calculated results of ET and ETo. Based on the motion equation of unsaturated soil water （Richards formula） , the paper developed a one-dimensional numerical model for soil water content and simulated the soil water content. The results indicated that： the coefficient of moisture availability is significantly influenced by topsoil water content and ET ; the coefficient mean of moisture availability of the check dam area （0.31） is higher than that of the slope （0.17） ;the developed model exhibited rela- tively high simulation accuracy, both the correlation coefficient between observed soil water content and calculated result, and the Nash-Sutcliffe efficiency （ NSE ） are more than 0.90. The results can provide the basis and method reference for the further research on ETand soil water motion at the check dam area of northern loess plateau.
出处
《水资源与水工程学报》
2016年第3期226-232,236,共8页
Journal of Water Resources and Water Engineering
基金
国家自然科学基金项目(41271046
51009026)
扬州市"绿扬金凤计划"优秀博士人才项目(yzlyjfjh2013YB105)
扬州大学科学研究启动基金项目(5015-137010583)
关键词
淤地坝
蒸散发
水分有效性
土壤水分
六道沟流域
check dam area
evapotranspiration
moisture availability
soil water content
Liudaogoubasin
