Finding Areas at Risk from Floods in a Downpour Using the Lidar-Based Elevation Model

• 作者: Sultana Nasrin Baby Colin Arrowsmith Gang-Jun Liu David Mitchell Nadhir Al-Ansari Nahala Abbas
• 来源期刊: 土木工程与建筑:英文版
• 学科: 地球科学
• 关键词: LIDAR flood-risk model builder blue spot model ESRI DEM
• 年，卷（期）: tmgcyjzywb_2021,（1）
• 页码范围: 1-16
• 页数: 16页
• 分类号: P73

摘要

Climate change can impact coastal areas in different ways,including flooding,storm surges,and beach erosion.Of these,flooding has a major impact on the operation of coastal drainage systems.This paper develops a new flood screening model using a LiDAR based digital elevation model(DEM)to improve the implementation of Victorian’s coastal flooding risk assessment and management.Hydrological elevation models are directed towards protection from cloudbursts and applied to rising sea level.The aim is to simulate water flow on the ground and in streams,and the resulting accumulation of water in depressions of the blue spot using DEM.Due to the presence of pipes,watercourses,bridges and channels it was required that the DEM data to be lowered.The reservoirs of rain will prevent seawater from flowing across the stream channel into land.The rain drain will be open during normal sea levels to allow rain water in the river to move and flow in to the sea.Traditionally,geographic information system(GIS)assists with spatial data management,but lacks modelling capability for complex hydrology problems and cannot be relied upon by decision-makers in this sector.Functionality improvements are therefore required to improve the processing or analytical capabilities of GIS in hydrology.This research shows how the spatial data can be primarily processed by GIS adopting the spatial analysis routines associated with hydrology.The objective of this paper is to outline the importance of GIS technology for coastal flood management.Following a definition of the coastal flood,and,short description of its peculiarities and the urgency of its management,this paper describes the use of GIS technology in coastal flood management,its advantages and the consideration for accuracy.This is followed by the information and LiDAR data required for coastal flood management and the application area in coastal flood management.This paper method is presented to conduct a first high-resolution DEM screening to detect the degree and capacities of the sink