Utilizing GIS and Infoworks RS in Modelling the Flooding Events for a Tropical River Basin

Abstract

The large-scale atmospheric circulations and anomalies have been shown to have asignificant impact on seasonal weather over many parts of the world including Malaysia. Malaysia is located in the South East Asia with Southwest and Northeast Monsoons, experiences numerous flooding from year 1926 to 2012.Flood has become a regular disaster in Malaysia which happens every year in different states especially during the northeast monsoon. In December 2006 and January 2007, the Northeast Monsoon brought heavy rain through series of continuous extreme storms that caused devastating floods in the southern region of Peninsular Malaysia particularly to Kota Tinggi, Johor. The storms had occurred in two separate phases in late December 2006 and early January 2007 with atotal precipitation in four days exceeding twice of the monthly rainfall in which some places recorded a higher number. Johor River originates from Mt. Gemuruh and flows through the southeastern part of Johor and finally into the Straits of Johor. The 2006 average rainfall return period is 50-years while the 2007 gives more than 100-years return period. The objective of this study is to perform a flood simulation of the river basin using InfoWorks RS. The rainfall and stream flow data have been used as the hydrological input for the model. There are over 140 nodes representing the cross section throughout the length of the river. From the study, the main finding from the flood mapping process is that the simulated flood depth and flood risk map. Comparison between the simulated flood depth and observed flood depth has been done and shown a reasonable agreement.

Building ANN-Based Regional Multi-Step-Ahead Flood Inundation Forecast Models

“…The main components of the InfoWorks ICM consist of an ISIS flow simulation engine, a geographic information system (GIS), and a database. The model carries out two-dimensional flood routing simulation in consideration of hydraulic facilities/modeling [32,33]. The two-dimensional (2D) hydrodynamic model routes water over in the Digital Elevation Model (DEM) forced by upstream boundary conditions such as a meteorological forcing, or a hydrograph and downstream boundary conditions of water levels.…”

Generation of Flood Map Using Infoworks for Sungai Johor

“…Northeast Monsoon is from December to March cause of severe floods in several states located in Peninsular Malaysia during December 2006 and January 2007 floods [6]. These events had caused millions of lost and damages in four states namely Johor, Negeri Sembilan, Melaka and Pahang [7]. [6].…”