A scoping review of flash floods in Malaysia: current status and the way forward

Maqtan, Raidan; Othman, Faridah; Jaafar, Wan Zurina Wan; Sherif, Mohsen; El‐Shafie, Ahmed

doi:10.1007/s11069-022-05486-6

Cited by 13 publications

(4 citation statements)

References 83 publications

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“…Flash floods in small and steep mountainous catchments can be particularly dangerous as they lead to a rapid rise in discharge and water velocities (Bruland, 2020;Moraru et al, 2021). Complex topography and meteorological complexity in such catchments make it even more difficult to model flash floods (Li et al, 2020;Maqtan et al, 2022). Usually, flood scenarios are modeled using hydrological and hydraulic models separately.…”

Section: Introductionmentioning

confidence: 99%

Comparison of two hydrodynamic models for their rain-on-grid technique to simulate flash floods in steep catchment

Godara,

Bruland,

Alfredsen

2024

Front. Water

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In this study, two hydrodynamic models, TELEMAC-2D and HEC-RAS 2D, were compared for their Rain-on-Grid (RoG) technique with a particular focus on runoff generation processes in a small and steep catchment. Curve number (CN) method was applied in both the models to simulate two single storm events up to 20 h of duration, whereas the Green-Ampt Redistribution (GAR) method was additionally applied in HEC-RAS 2D for a multi-peak flood event with sustained flow between the peaks. CN and GAR methods were compared for this flood event, and a sensitivity analysis of the GAR parameters was also done. Moreover, the two models were compared for their calibration process, computational time, mesh size and shape, and model availability, in general, as well as the results including inundated areas, water depth, and velocity. The results indicate that both the models are capable of reproducing short duration single storm floods. NSE and R2 for both models ranged from 0.70 to 0.90 and from 0.93 to 0.95. However, the models struggled to reproduce the long- duration multi-peak flood event. The sensitivity analysis showed that the results are not very sensitive to the two GAR parameters which are responsible to influence the flow of the second peak in the flood event. Neither the CN nor the GAR infiltration method successfully replicated such events because the hydraulic models permanently lose infiltrated water from the domain. The returned sub-surface flow significantly contributes to river flow during these flood events; however, none of the model incorporates a return flow algorithm.

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Section: Introductionmentioning

confidence: 99%

Comparison of two hydrodynamic models for their rain-on-grid technique to simulate flash floods in steep catchment

Godara,

Bruland,

Alfredsen

2024

Front. Water

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“…Bangladesh is subjected to different types of floods such as river (often called the monsoon) floods, tidal or coastal, flash, and tropical cyclones-induced storm-surge floods [44,45] . e A precise definition of flash floods is problematic and frequently debated (e.g., [46][47][48][49] . Flash floods are caused by excessive rainfall in a short period of time with a small lead time and very limited warning time.…”

Section: Was the 2020 August Event Considered A Flash Flood?mentioning

confidence: 99%

Coping Measures and Social Capital in Offsetting Effects of an Estuary Flash Flood in Bangladesh: A Case Study

Rahman,

Paul,

Hossain

2024

j. of geogr. res.

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The northern, northeastern, and southeastern parts of Bangladesh are highly susceptible to the impacts of flash flooding. Beyond these typical areas, flash floods also occur in the coastal areas of the country. The objective of this paper is to examine the ways residents of a coastal area have coped with the impacts of the flash flood event that took place on 5 August 2020 in 26 villages of Kamalnagar and Ramgati upazilas in the Lakshmipur district, Bangladesh. A household survey conducted in these villages revealed that nearly 83% of the respondents adopted two of the six broad groups of coping measures to recover from the impacts of the 2020 flash flood event. Unlike flash floods in typical areas, the survivors in the study area did not receive any emergency assistance either from local/national governments or NGOs, creating a cause of anger among the flash flood survivors. They offset the event effects largely by social capital through social networks and social relations. This study concludes that the government of Bangladesh should have effective policies to reduce the impacts of coastal flash flooding.

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“…For example, if different government agencies have different responsibilities and jurisdictions for flood management, it can be difficult to ensure that all aspects of flood risk are being addressed and that resources are being used most efficiently. This can also lead to confusion and conflicting priorities among different agencies, making it difficult to achieve a cohesive and effective response to a flood event [94,95].…”

Section: Inadequate Power and Authoritymentioning

confidence: 99%

Reviewing Challenges of Flood Risk Management in Malaysia

Rosmadi,

Ahmed,

Mokhtar

et al. 2023

Water

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This study reviewed some of the challenges faced by local authorities in disaster management, especially flood disasters that occurred in Malaysia. Flood disasters are the most frequent disasters in Malaysia, especially during the monsoon seasons. The hard structure developed by Malaysia’s National Security Council (MKN) under ‘Directive 20’ is used to manage disasters in the country. Although Malaysia has become more skillful in managing flood disasters, the frequent climate changes along with weakness in implementing flood risk management plans resulted in much losses and damages throughout the country. Therefore, this study explored the gaps and weaknesses in flood risk management (FRM) in Malaysia by reviewing the available literature to recommend better flood management. This study revealed four main issues which are weaknesses in terms of (i) coordination and communication, (ii) manpower and assets, (iii) public awareness, and (iv) power and authority among local authorities to implement flood management plans. The capacity of local authorities and individuals in charge of disaster management is inadequate, especially for flood risk preparedness and management. Hence, responsible individuals are also in a vulnerable situation to implement management plans or rescue operations when flood disasters occur since they are also flood victims. Thus, the National Disaster Management Agency (NADMA) which acts as the main coordinator of disaster management in Malaysia should re-examine the flood management plan to ensure that it can be implemented efficiently and effectively, especially at the local level as they are the first respondents on the scene when the disaster occurs. The combination of both structural and non-structural measures might require in many cases the management of flood disasters; however, the disaster risk preparedness and management of individuals via customized training is a must to prevent flood disasters as well as minimize their impact. The flood management plan should also incorporate natural-based approaches at the whole-river-basin level for the long-term solution and sustainable development, not only focusing to manage the localized flood problem at the specific area.

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A scoping review of flash floods in Malaysia: current status and the way forward

Cited by 13 publications

References 83 publications

Comparison of two hydrodynamic models for their rain-on-grid technique to simulate flash floods in steep catchment

Comparison of two hydrodynamic models for their rain-on-grid technique to simulate flash floods in steep catchment

Coping Measures and Social Capital in Offsetting Effects of an Estuary Flash Flood in Bangladesh: A Case Study

Reviewing Challenges of Flood Risk Management in Malaysia

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