绿洲-荒漠交错带潜水-土壤-植被-大气连续体水热传输模型研究

Computer simulation of water movement and heat transfer in groundwater-soil-vegetation-atmosphere continuum at oasis-desert ecotone.

该文以干旱区绿洲-荒漠交错带为研究对象,以质量守恒原理与能量平衡原理为基础,建立了潜水-土壤-植被-大气系统中水分与热量传输模式,并提出了求解潜水-土壤-植被-大气系统的数值模拟分解-协调新方法,用天山北麓三工河流域绿洲-荒漠交错带的实测资料验证了水热传输模型的可靠性.结果表明,植被冠层蒸腾量模拟值与实测值比较接近,其最大误差为11.3%,土壤含水率的模拟值与实测值的最大误差仅为5.9%,土壤温度模拟值与实测值的最大误差为8.3%,用该模型模拟绿洲-荒漠交错带潜水-土壤-植被-大气连续体水热动态传输过程、植被蒸腾量、地表蒸发量和植被的根系吸水率具有较高的精度.

A coupling model for studying transport of water and heat in groundwater-soil-vegetation-atmosphere continuum （GSVAC）at oasis-desert ecotone was developed based on the energy balance law and mass conservation law. A new simulation method of decompose-coordination for solving the water and heat transfer model in GSVAC was presented. At last, the experimental data, which were obtained at the field station in Sangong River Watershed in the northern slope of Tianshan Mountain, were used to validate the models of GSVAC. Results showed that the maximum relative error of canopy transpiration between simulation values and measured values was 11.3 %, and 5.9 % for soil water content and 8.3 % for soil temperature. The simulation model and methods will offer a guidance for the research of GSVAC.