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首页> 外文会议>Asian conference on remote sensingACRS >UNDERSTANDING THE IMPACTS OF STORMINDUCED FLOODING AT THE LOCAL LEVEL THROUGH FLOOD MODELLING WITH SAR DEM, LIDAR DTM DSM, HEC HMS AND HEC RAS
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UNDERSTANDING THE IMPACTS OF STORMINDUCED FLOODING AT THE LOCAL LEVEL THROUGH FLOOD MODELLING WITH SAR DEM, LIDAR DTM DSM, HEC HMS AND HEC RAS

机译：通过SAR DEM，LIDAR DTM＆DSM，HEC HMS和HEC RAS泛滥模拟涡轮脉冲洪水对地方水平的影响

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摘要

Flooding has long been considered to be one of the deadliest natural disasters. In large river basins, flooding can submerge a whole city and cause irreparable damage to human lives and properties. The same can be said at the local level where a small creek can submerge a whole barangay, especially if the creek receives large volume of water from the upstream that are beyond its capacity. In this paper, we analyzed the physical impacts of flooding caused by the overflowing of Lemon Creek to the surrounding local community in Butuan City, Philippines. The physical impacts were analyzed in terms of flood depth and inundation extent during heavy rainfall caused by tropical storms/typhoons. In this study, we focused on the flooding impacts of Tropical Storm Agaton (January2014) and Seniang (December 2014). First, we developed a HEC HMS based hydrological model of the Lemon Creek watershed to determine the volume of water flowing into the creek during the storm durations. The HEC HMS model was developed using a 10m SAR DEM for watershed and stream delineation and a Landsat 8 OLI image for land cover parameter derivation. Discharge measurements were used to calibrate and validate the model. Then, we developed a HEC RAS model to simulate the overflowing of the creek during the storm events, with the HEC HMS simulated discharge hydrographs as inputs. A 1m resolution LiDAR Digital Terrain Model (DTM) acquired before the storms was used in generating the geometrical parameters of the HEC RAS model, and as input in the flood depth and inundation mapping. Results of the integrated HEC HMS HEC RAS flood modeling showed the extent of flooding during Agaton and Seniang. Using location of structures digitized from a LiDAR Digital Surface Model (DSM), the severity of the impacts of flooding to the local community was determined by counting the number of structures inundated during the onslaught of the tropical storms.
机译：洪水已被认为是最致命的自然灾害之一。在大河流域，洪水可以淹没整个城市，对人类生活和物业造成无法弥补的损害。同样可以在地方一级说，小溪可以淹没一个整个巴兰那，特别是如果小溪从超出其容量的上游接收大量的水量。在这篇论文中，我们分析了菲律宾津港市河口河流溪流溢出洪水造成的洪水影响。在热带风暴/台风引起的大雨期间，在洪水深度和淹没程度方面进行了物理影响。在这项研究中，我们专注于热带风暴Agaton（1月2014年）和Seniang（2014年12月）的洪水影响。首先，我们开发了一种基于HEC HMS的柠檬小溪流域水文模型，以确定风暴持续时间内流入溪流的水量。 HEC HMS模型是使用10M SAR DEM开发的流域和流描绘，并为陆地覆盖参数推导的Landsat 8 Oli图像。放电测量用于校准并验证模型。然后，我们开发了一个HEC RAS模型，以模拟风暴事件期间的溪流溢出，HEC HMS模拟排放水电照片作为输入。在暴风雨之前利用之前获得的1M分辨率LIDAR数字地形模型（DTM）在生成HEC RAS模型的几何参数中，并作为洪水深度和淹没映射的输入。综合HEC HMS HEC RAS洪水建模的结果显示了对战者和Seniang的洪水程度。使用从激光雷达数字表面模型（DSM）数字化的结构的位置，通过计算热带风暴的冲击期间淹没的结构数量来确定对当地社区的洪水影响的严重程度。

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