摘要
DPM模型是根据粉尘释放通量与粉尘跃移通量及跃移颗粒的动能通量成正比的原理,由土壤微团粒跃移模块以及粉尘粒子释放模块构成的。为验证DPM模型在半干旱地区农田的适用性,选取了半干旱地区陕西中北部4种典型土壤类型农田进行野外观测研究,计算分析了各观测区的地表空气动力学粗糙度、表土微团粒粒度、摩阻风速和起动摩阻风速,对比分析了不同土壤类型、不同季节DPM模型模拟的准确性。结果表明,DPM模型可以用于模拟预测我国半干旱区农田不同土壤类型粉尘释放通量,可以较好地用于模拟预测半干旱农田夏冬两季节的粉尘释放通量。
DPM model,built on the principles that the dust emission flux is proportional to the dust saltation flux and the kinetic energy flux of saltating particles,is composed of two components： the saltation flux of soil microaggregates and dust particle emission.To validate the applicability of DPM to semi-arid areas,we selected four typical types of farmlands（soils） in the semi-arid north-central Shaanxi Province,measured and calculated the surface aerodynamic roughness,microaggregate distribution of surface soils,friction velocity,and threshold friction velocity on each study area,and comparatively analyzed the DPM model simulation accuracy between the different soil types and between different seasons.The results showed that DPM model can be used to simulate dust emission flux of the different soil types in the semi-arid farmlands,and can better simulate dust emission flux for the summer and winter seasons in the semi-arid farmlands.
出处
《水土保持通报》
CSCD
北大核心
2011年第3期126-130,共5页
Bulletin of Soil and Water Conservation
基金
陕西省自然科学基金"西安城市地表粉尘释放通量的观测与模拟"(2007D20)
陕西省教育厅专项科研基金"西安市地表粉尘释放通量数值模拟研究"(06JK268)
