Flood hazard map of sungai kulim using high percentage of overlapping images captured by (UAV) drone
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Date
2018-06
Authors
Ahmad Danial Kahfi Ghani
Journal Title
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Abstract
Sungai Kulim is the main river that flows through the town of Kulim in southern
Kedah. It flows largely in a northwesterly direction to empty into the Perai River on the
Seberang Perai. In 2017, flood occurred in downstream area of Sungai Kulim. This
phenomenon probably due to high intensity of rainfall caused the uncontrollable amount
of water discharge from upstream of Sungai Kulim. Impacts of that flood, nearly 100
houses located at the low-lying areas were destroyed or under water and the local
residents were urged to move to the relief centre. Thus, study on various average water
discharge based on return period of 2, 3, 5, 10, 25, 50, 100, and 200 years along 5 km
length and 200 m width downstream river was conducted. The Unmanned Aerial Vehicle
(UAV) Drone was used to capture the orthophoto of river in high percentage overlapping
images. The main objective in this study is to simulate the flood extent using Hydraulic
Engineering Center’s River Analysis System (HEC-RAS) software which is constructed
by US Army Corp. HEC-RAS software was used to aid in channel flow analysis and
flood water level determination by researchers around the world. The flood water level
can helps evaluate effect of the downstream area due to average rainfall intensity. Using
Digital Elevation Model (DEM) generated by Agisoft Photoscan software, HEC-RAS
will simulate the area of flood probably occurred. The amount of water discharge used
in the simulation were 44.25, 50.58, 57.59, 66.42, 77.58, 85.86, 94.08, and 102.27 m3
/s.
The water discharge were based on return period of 2, 3, 5, 10, 25, 50, 100, and 200
years. As a result, maximum velocity, maximum depth, arrival time and inundation
boundary maps were produced. This finding was able to produce flood hazard map and
predict risk area of flooding. This study also helped authorities to construct the
emergency plan as to prevent flood occur in downstream area of Sungai Kulim. Besides,
this study can give awareness to local residents of risk area on flood.