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所在平台: Udemy |
课程主页: https://www.udemy.com/course/flood-inundation-mapping-using-rs-dems-and-ras-mapper/
课程评论：没有评论
**课程摘要：利用遥感数字高程模型（RS DEMs）和RAS Mapper进行洪水淹没制图** 本课程专注于应对全球范围内造成巨大财产损失和人员伤亡的重大自然灾害——洪水。课程强调，特别是在发展中国家，准确的洪水淹没制图至关重要。 课程深入探讨了结合地理信息系统（GIS）的液压模型在洪水模拟中的作用，并指出模型性能受多方面因素影响，包括模型类型（一维或二维）、河流和泛洪区几何形状的准确表示、模型假设/参数以及边界和初始条件的可靠性。其中，数字高程模型（DEMs）是描述泛洪区和河流通道几何形状的关键输入数据。 课程将介绍多种DEM数据源，包括高分辨率但成本高昂的，以及成本较低但分辨率较低的，例如ASTER、SRTM、ALOS和GTOPO30。尤其强调在地形数据稀缺的地区，基于遥感的DEM是进行洪水淹没制图和其他水力模拟的最佳选择。 通过本课程，学员将系统学习从下载DEM数据到在HEC-RAS 6环境中运行模型及可视化结果的全部必要步骤。课程结束后，学员将具备利用遥感DEM生成不同重现期洪水淹没图的能力。
Flooding is one of the major natural disasters that affect many parts of the world and has led to huge amounts of property damage and human life losses, especially in developing countries. During the past 30 years, several hydraulic models have been developed and integrated with the Geographic Information Systems (GIS). The performance of these models depends on several factors, among them the choice of hydraulic model (1D or 2D), a correct representation of the river channel and floodplain geometry, model assumptions/ parameters, reliable boundary, and initial conditions are required to achieve accurate results, such as Flood Extent and Water Surface Elevation (WSE) along the river.Among these factors, the geometric description of the floodplains and river channels has been reported to be one of the fundamental input data in hydraulic modeling and this input data can be obtained from the Digital Elevation Models (DEMs). Currently, there are several DEM sources that range from fine-resolution and accurate, but costly, to low-cost and low-resolution, such as ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer), SRTM (Shuttle Radar Topography Mission), ALOS (Advanced Land Observing Satellite) and GTOPO30 (global 30 arc-second elevation).In data-sparse regions accessing to ground high-quality topography maps is impossible, and so using Remotely Sensed based DEM is the best choice for flood inundation mapping or other hydraulic simulations. Therefore, in this course all required steps from downloading DEMs to Running and Visualizing the results in HEC-RAS 6 environment are described completely. After finishing this course you will be able to extract flood maps for different return periods based on RS DEMs.
