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https://ptsldigital.ukm.my/jspui/handle/123456789/487212| Title: | Hydraulic modeling of road drainage during tropical flash floods |
| Authors: | Mohammed Saleh Jaballa Alghadi (P77766) |
| Supervisor: | Wan Hanna Melini Wan Mohtar, Assoc. Prof. Dr. |
| Keywords: | Universiti Kebangsaan Malaysia -- Dissertations Dissertations, Academic -- Malaysia Road drainage Hydraulic modeling Flash floods |
| Issue Date: | 22-Sep-2021 |
| Description: | Road drainage systems are often designed and constructed utilizing design approaches without considering the possible hydrological responses effect. As a result, the system is insufficient due to infrastructural development and climate change and ultimately, increased hydrological reaction. This study assessed the flash-flood induced effects of precipitation intensity variation based on historical and future rainfall events on the current road drainage system as, whether pre-climatic change storm water drainage system could withstand potentially higher discharges, and the need for modified design guidelines incorporating possible precipitation intensity variations due to climate change. To this end, a case study was undertaken throughout 2008 to2017 by utilizing rainfall data to develop intensity-duration-frequency (IDF) curves representing precipitation volume variations due to climate change. There are various methods used to execute the watershed model that finally yield the flood depth profile such as (SWMM, HEC-RAS, Mouse, Music and Mike-she etc). Runoff simulation via Storm Water Management Model (SWMM version 5.1) was conducted to examine whether peak discharge increments due to extreme climate change would adversely affect the current drainage network in conveying excessive runoff. The peak discharge and water level were simulated for the existing open drainage system based on the use of three scenarios of low impact development (LID) facility as a means to optimize flash flood control. In this study, three future potential climate scenarios, namely 2030, 2040, and 2050 were simulated based on the Representative Concentration Pathways (RCPs), RCP4.5 and RCP8.5 scenarios. The results showed a tremendous future precipitation increment in the simulated years of 2030, 2040, and 2050 consecutively for RCP4.5 and RCP8.5 scenarios, yielding the following values, respectively: 28.8% and 43.7%, 34.6% and 65%, and 61.5% and 75.5%. Therefore, the climate changed based rainfall intensity should be considered when detailing assessments and preserving areas at risk of high water flows. Road drainage system inadequacy to manage copious surface runoff anticipated due to climate change suggests the need for increased drainage system sizes by optimized urban flash flood control for flood risk reduction in densely developed areas. Before deciding on system adaptation or construction, local authorities must be highly-equipped about potential changes in climate change-based discharge behaviors.,Ph.D. |
| Pages: | 138 |
| Publisher: | UKM, Bangi |
| Appears in Collections: | Faculty of Engineering and Built Environment / Fakulti Kejuruteraan dan Alam Bina |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| ukmvital_125316+SOURCE1+SOURCE1.0.PDF Restricted Access | 2.46 MB | Adobe PDF |  View/Open |
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