基于遥感的海南岛橡胶林零平面位移和粗糙度估算

Zero-Plane Displacement and Roughness Length of Rubber Plant in Hainan Island Based on MODIS

在橡胶风害评估中,橡胶林零平面位移和粗糙度是建立定量评估模型的重要动力学参数。以MODIS遥感数据为信息源,计算橡胶林的叶面积指数,并利用形态学Raupach方法,估算橡胶林归一化零平面位移和粗糙度。该方法充分发挥了遥感大面积获取数据的优势,同时解决了传统气象学方法获取橡胶林零平面位移和粗糙度需要大量长期的野外观测资料的限制。结果表明:橡胶林叶面积指数与归一化零平面位移和粗糙度分别存在正相关和负相关;估算结果精度能满足橡胶风害评估模型参数的需求。研究结果可为开展大范围内橡胶林风害评估提供技术支撑。

Zero-plane displacement and roughness length of rubber are crucial parameters in the typhoon impact assessment model on rubber plant. Leaf area index was derived based on the MODIS remote sensing data. Zeroplane displacement and roughness length of rubber were derived by the morphology model. This method not only made full use of the advantage of remote sensing, but also solved the traditional meteorology method to get zeroplane displacement and roughness depending on a long-term field observation data. The results showed that leaf area indices were positively and negatively correlated with d/h and z0/h. The accuracy of result could meet the need of rubber wind damage assessment model parameters. The results provided technical support for carrying out large scale rubber wind damage assessment.