Socio-hydrological modelling: the influence of reservoir management and societal responses on flood impacts

<p>Over the last few years, several socio-hydrological studies have investigated the dynamics of risk generated by feedback mechanisms and interactions between floods and societies, with a focus on either changing reservoir operation rules or raising levees. In this study, we propose a new socio-hydrological model of human-flood interactions that represents both changes in the operating rules of reservoirs and updating of the levee system. Our model is applied to simulate three prototypes of floodplain management strategies: green systems, in which societies cope with flood risk by resettling outside the flood-prone area; technological systems, in which societies cope with flood risk also via structural measures, such as levees; and green-to-techno systems, in which societies shift from green to technological approaches. Floodplain dynamics are explored simulating future scenarios in the city of Brisbane, Australia. Results show that flood risk is strongly influenced by the flood memory of reservoir operators and their risk-awareness levels control the development of communities. Furthermore, scenarios of more frequent and higher magnitude events prove to enhance social preparedness levels in green systems, while technological systems experience much higher losses.</p>

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Socio-Hydrological Modelling: The Influence of Reservoir Management and Societal Responses on Flood Impacts

Water ◽

10.3390/w12051384 ◽

2020 ◽

Vol 12 (5) ◽

pp. 1384 ◽

Cited By ~ 2

Author(s):

Cinzia Albertini ◽

Maurizio Mazzoleni ◽

Vincenzo Totaro ◽

Vito Iacobellis ◽

Giuliano Di Baldassarre

Keyword(s):

Flood Risk ◽

Management Strategies ◽

Reservoir Management ◽

Floodplain Management ◽

Technological Systems ◽

Flood Impacts ◽

Operation Rules ◽

Structural Measures ◽

Prone Area ◽

Levee System

Over the last few years, several socio-hydrological studies have investigated the risk dynamics generated by the complex interactions between floods and societies, with a focus on either changing reservoir operation rules or raising levees. In this study, we propose a new socio-hydrological model of human–flood interactions that represents both changes in the reservoir management strategies and updating of the levee system. Our model is applied to simulate three prototypes of floodplain management strategies to cope with flood risk: green systems, in which societies resettle outside the flood-prone area; technological systems, in which societies implement structural measures, such as levees; and green-to-techno systems, in which societies shift from green to technological approaches. Floodplain dynamics are explored simulating possible future scenarios in the city of Brisbane, Australia. Results show that flood risk is strongly influenced by changes in flood and drought memory of reservoir operators, while risk-awareness levels shape the urbanisation of floodplains. Furthermore, scenarios of more frequent and higher magnitude events prove to enhance social flood memory in green systems, while technological systems experience much higher losses. Interestingly, green-to-techno systems may also evolve toward green floodplain management systems in response to large losses and technical/economical unfeasibility of larger structural measures.

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Towards sustainable community: Effort to reduce flood risk and increase well-being in a densely populated flood-prone area

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/930/1/012096 ◽

2021 ◽

Vol 930 (1) ◽

pp. 012096

Author(s):

L Sedyowati ◽

G Chandrarin ◽

G I K Nugraha

Keyword(s):

Community Involvement ◽

Flood Risk ◽

Flood Control ◽

Local Community ◽

Well Being ◽

Economic Benefits ◽

Prone Area ◽

Community Effort ◽

Flood Prone Area ◽

Almost All

Abstract Dealing with flooding in a densely populated flood-prone area poses complex challenges. Almost all residents realize that living in the area is hazardous. However, they choose to stay there. Therefore, flood risk management should be applied in the area. This study aims to: 1) develop facts of the local community in a flood-prone area in decreasing the flood risk while improving well-being through modifying drainage channels used for fish and vegetable farming; 2) evaluate all benefits of drainage investments include the social and economic benefits. The research method consists of a quantitative approach through the distribution of questionnaires and a qualitative approach through in-depth interviews and field surveys. In this study, a concerted community effort was developed as a design parameter. At the same time, the observation parameters include knowledge of the causes of flooding, knowledge of flood risk, community involvement, and government flood control programs. The results showed that the strength of concerted community effort was significantly influenced by the knowledge of flood risk and the local community involvement. This effort can decrease the flood risk by up to 30% and serve direct financial benefits of IDR 48 million in a year.

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Analysis of the exposure of Polish lakes to flood risk

Limnological Review ◽

10.2478/limre-2015-0005 ◽

2015 ◽

Vol 15 (1) ◽

pp. 39-50

Author(s):

Anna Pasiecznik-Dominiak ◽

Andrzej Tiukało ◽

Grzegorz Dumieński

Keyword(s):

Flood Risk ◽

Flood Hazard ◽

Risk Level ◽

Resilience Theory ◽

Risk Area ◽

The Social ◽

Prone Area ◽

Extreme Hazards ◽

Flood Prone Area

Abstract Flooding constitutes one of the main natural hazards in Poland, which causes enormous social, economic and environmental losses. The main causes of the occurrence of floods include intensive rainfall, rapid melting of snow and ice cover, as well as strong gusts of wind from the sea. Based on the resilience theory (resistance, elasticity), which constitutes an efficient tool for the description of the social-ecological system capability or components thereof to mitigate the effects of dangerous events, as well as the capability of reconstructing and adapting the system to new conditions, the authors have analysed the exposure of Polish lakes to flood risks with a probability of occurrence Q0.2%, Q1% and Q10%. In order to determine the level of exposure of lakes to the risk of flooding by flood waters, studies were conducted using the flood hazard and flood risk maps which were developed under the Project entitled “IT System of the Country’s Protection against Extreme Hazards”. The result of the efforts of the group of authors is the determination of the number of lakes, which are located in the flood risk area Q0.2%, Q1% and Q10%, including division into risk level groups (low, moderate and high). The results presented in the paper may constitute a contribution to further, more detailed studies concerning assessment of the vulnerability of Polish lakes located in the flood prone area.

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Households’ Evacuation Decisions in Response to the 2011 Flood in Thailand

Journal of Disaster Research ◽

10.20965/jdr.2020.p0599 ◽

2020 ◽

Vol 15 (5) ◽

pp. 599-608

Author(s):

Ruttiya Bhula-or ◽

◽

Tadashi Nakasu ◽

Tartat Mokkhamakkul ◽

Sutee Anantsuksomsri ◽

...

Keyword(s):

Real Time ◽

Local Governments ◽

Management Strategies ◽

Economic Resilience ◽

Management Level ◽

Moral Hazards ◽

Prone Area ◽

Flood Prone Area ◽

Reduced Mobility ◽

Damages And Losses

This study aims at clarifying households’ responses to the flood in Thailand. The result of this study helps fill the gap in literature about the factor affecting a household’s decision to evacuate in response to the flood, as such a decision varies with the type of natural disaster. The result of the study confirms that more vulnerable people are less likely to evacuate. However, they are more likely to evacuate, if at least one of their household members has reduced mobility. People in flood-prone areas exhibited moral hazards. Furthermore, people with relatively secured employment statuses are more likely to stay in the flood-prone area, to minimize their losses from the flood. If households with management-level employees received real-time and accurate updates about the flood, the decision to evacuate would be freely decided by such households, which can minimize their losses. Similarly, real-time and accurate data about potential damages and losses can reduce moral hazards. Thus, it is necessary for national and local governments to understand area-specific characteristics of people and linkages between societal vulnerability and economic resilience. The study’s implications highlight the importance of developing disaster management strategies in an integrated area-based approach.

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Flood Risk Assessment in Asian Flood Prone Area with Limited Local Data – Case Study in Pampanga River Basin, Philippines –

Journal of Disaster Research ◽

10.20965/jdr.2016.p1150 ◽

2016 ◽

Vol 11 (6) ◽

pp. 1150-1160 ◽

Cited By ~ 2

Author(s):

Miho Ohara ◽

◽

Naoko Nagumo ◽

Badri Bhakta Shrestha ◽

Hisaya Sawano ◽

...

Keyword(s):

Risk Assessment ◽

River Basin ◽

Flood Risk ◽

Evidence Based ◽

Flood Risk Assessment ◽

Damage Cost ◽

Local Data ◽

Prone Area ◽

Flood Prone Area

Disaster risk assessment is vital to determining needs for disaster countermeasures and promoting their implementation. However, it is difficult to conduct evidence-based risk assessment in flood-prone areas of Asia due to area-specific characteristics such as limited local data on natural and societal conditions and local lifestyles of persons who have adapted to frequent floods. This paper proposes basic flood risk assessment considering these characteristics and explores a case study conducted in a flood-prone area of the Pampanga River basin in the Republic of the Philippines to verify our method. We surveyed local household members as part of the study to understand local situations, finding that past flood damage cost little thanks to building structures adapted to frequent flooding and to local ways of protecting property during floods. We also found that the use of depth-damage curves developed for urban areas may overestimate anticipated damage expected in future floods when these curves are applied to flood-prone rural areas. For this reason, we propose a method of flood risk assessment for evaluating the societal impact on residents’ lives using observed thresholds of inundation depth by flood simulation, rather than using a method that estimates damage cost. Application of our proposal to the case study area confirmed its applicability and effectiveness in evidence-based planning for reducing flood risk.

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Flood Risk Assessment Using Geographic Information System Techniques: In Guba Lafto District, North Wollo Zone, Amhara National Regional State, Ethiopia.

10.21203/rs.3.rs-768774/v1 ◽

2021 ◽

Author(s):

Dinku Ebabu ◽

Fikadu Fufa ◽

Asnake Boyana ◽

Getahun Sisay

Keyword(s):

High Risk ◽

Flood Risk ◽

Key Factors ◽

Weighted Overlay ◽

Causative Factors ◽

Prone Area ◽

Significant Area ◽

Risk Areas ◽

Risk Zones ◽

Flood Prone Area

Abstract Background In Ethiopia, flooding has long been recognized as one of the major environmental perils that often develop into a disaster affecting the lives and livelihoods of people for many years. Assessing flood causative factors and identifying flood risk prone areas are very crucial to minimize the harmful consequences of the hazard on the socio-economic conditions of the environment. Result The causative factors of flooding were developed and converted into raster formats to make them classification-ready. Finally, weighted overlay analysis is used to generate the flood risk areas. Based on key factors, the district was classified in to five-risk classes namely; very low, low, moderate, high and very high-risk Flooding zones. The major finding of the study prevails that, most areas of the district is at low, moderate and high-risk zones accounts 25.58, 61.41 and 12.81% respectively. Conclusion The flood prone area is mainly found in the eastern and southern parts of the study area based on their LULC type, soil characteristics and nearness to rivers. The study demonstrates, a significant area of the district is at a high risk for flooding and hence preliminary measures should be taken with the concerned bodies to reverse the resulting adverse impacts on environment.

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Development of Flood Prone Area Map for Igbokoda Township using Geospatial Technique

Journal of Applied Science & Process Engineering ◽

10.33736/jaspe.433.2017 ◽

2017 ◽

Vol 4 (2) ◽

pp. 158-178 ◽

Cited By ~ 5

Author(s):

James R. Adewumia ◽

James K. Akomolafe ◽

Fidelis O. Ajibade

Keyword(s):

Flood Risk ◽

Vegetation Cover ◽

Slope Angle ◽

Landsat 8 ◽

Stream Network ◽

Rapid Urbanization ◽

Risk Zone ◽

Prone Area ◽

Risk Zones ◽

Flood Prone Area

Rapid urbanization has greatly increased the volume of runoff generated in many developed areas and subsequently resulting in flooding. This study evaluated the flood prone area of Igbokoda town in Ondo State and developed a flood risk map to facilitate proper planning and future flood mitigation. Scientific technique of GIS was used to identify flood risk areas within the study area. The Landsat 5 (TM), Landsat 7 (ETM+) and Landsat 8 (LC) images for 1986, 1999 and 2013 coupled with STRM 90 m DEM data of the area were used to identify three categorized risk zones. A total of 339 basins were delineated and stream network on the landscape of this area were carved. Hydrological and vegetation cover analyses were conducted using the satellite imageries obtained from United States Geological Surveys Archive online over the study area for three different epochs 1986, 1999 and 2013. There was a sharp decrease in area of vegetation cover from 1986 (19,630 ha) to 1999 (16,527.36 ha) and in 2013 (12,246.80 ha). The hydrological analysis results revealed that a major part of the residential area within the largest basin delineated was associated with low elevation and high slope angle. The combined stream network and slope of the area were used in developing flood risk zones. Three zones were specified: high, medium, and low flood risk zones. The total area covered by the high risk zone was 28.5615 km2 while the area of the medium and small risk zones were 15.94759 km2 and 31.3619 km2 respectively. It is recommended that an increased awareness on flood risk zone should be created among the populace of Igbokoda to guide them in further development.

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