【摘要】 以有限区域大气运动模式和土壤水热传导模式为基础,采用地表水分蒸发、地表水渗透、植被的蒸腾作用与根系吸水作用、地面风场4种过程作为模型的耦合方案,建立了用于干旱灾害成灾过程数值模拟的数学耦合模型.利用该数学模型模拟计算了1995年7月1～30日发生在长江中下游地区的干旱灾害,其干旱过程可分为土壤可供水量满足农作物需水量阶段、根系层土壤供水量小于农作物需水量阶段、农作物干旱阶段3个阶段,实践证明该模型对干旱灾害的发生发展过程具有很好的模拟能力.更多还原

【Abstract】 Based on the limited regional atmosphere movement mode and soil water heat\|conduction mode, a numerical simulation coupled model for the causing disaster in the arid calamity is developed. This model views surface water evaporation, surface water infiltration, vegetation transpirations and root system sucking function, ground wind field as the coupled project. Utilizing this coupled model, the process of drought disaster in the middle and lower reaches of the Yangtze River in July 1995 is simulated. The drought process is divided into three stages: the possible water supplied by soil is more than the crop requirement, the root system level can’t supply plenty of water for crops, and the crops arid stage. The practice shows that the model has good capacity for the development process of arid disaster happening.更多还原