Flooding Phenomena Research Articles

From tale to reality: Geographical differences in children's flood‐risk perception

Few studies have approached children's behaviour during flood disasters, and none of them were in Italy. In this study we performed an analysis of flood‐risk perception in children aged between six and 14 years in three Italian regions characterised by diverse typologies of flood phenomena. To perform such an analysis, we collected data using a fictional story which, through identification with the protagonist, allowed for reliable and spontaneous answers from the young respondents. The studied communities were the pilot areas of the European research project LIFE PRIMES, “Preventing flooding RIsks by Making resilient communitiES.” The findings highlighted various expressed behaviours, with some differences between areas. The most unsafe expressed behaviour was “running outside.” Such a reaction becomes proportionally less important from younger to older respondents. The safest expressed behaviour was “reaching a high place,” which appears later in children and becomes more important from younger to older respondents. Not all communities demonstrated a good correlation between those two behaviours and age groups. The analysis suggests the need to implement educational and training activities specifically focused on children's needs during flood emergencies and that take into account the different geographical conditions in which children live.

Integrated Inundation Modeling of Flooded Water in Coastal Cities

Climate change has increased the damage caused by subtropical rainfall and typhoons in coastal areas. Major flooding factors in coastal areas can be classified as storm surges, river inundation, and inland submergence. Because previous studies usually applied a linear sum of individual inundation components to predict comprehensive flood phenomena, this approach does not consider weighted effects associated with the simultaneous occurrence of complex flooding. In this study, a series of comprehensive flood simulations were performed using two numerical models: HDM-2D and FLUval Modeling ENgine (FLUMEN). The results revealed that an integrated flood analysis considering the effects of inundation flooding, river flooding, and coastal flooding required evaluation of the risk of flooding in coastal cities.

Hydraulic Analysis of Causes of Washout of Gdynia-Orłowo Sea-Shore During the Flood in the Kacza River Estuary

Abstract In July 2016 in the Three-city agglomeration a rainfall episode of over a day duration and 150 mm summary rainfall height, occurred. This situation, extreme as for Polish conditions, caused significant freshets in rivers and streams running into Gdansk Bay, the Baltic Sea, and serving as collectors of rainfall waters for the sea-coast towns. In many areas of the Three-city flood phenomena and overflows took place. The flood also occurred in the catchment area of the Kacza river in Gdynia. The passing of flood water rise caused damage of many infrastructure objects located along the river valley. The estuary section of the river suffered most, especially sea-shore belt together with beach around the estuary which were significantly washed out. In this paper an approach was made to answer to the question on direct causes of the situation which occurred at the estuary of the Kacza river. To this end, there was worked out a hydrodynamic model of the considered section of the river, based on the solving of two-dimensional differential motion equations of free-surface liquid, and simulations of water flow propagation along the river’s valley were performed for a few variants of hydraulic engineering infrastructure of river bed. Numerical hydraulic analysis made it possible to determine a role of the hydraulic engineering objects in forming the flood water rise as well as their impact on location and range of washout zones of sea-shore belt.

Local resilience towards overcoming floods of local climate change for adaptation: A study of marunda community in north jakarta

Sea level rise due the climate change has emerged the coastal flood phenomena in North Jakarta. Coastal flood gives a negative impact on the environment and socio-economic life of the Marunda community, forcing the communities to be locally adapted towards the disaster. Community Local adaptation defined as an effort to reduce the risk of flooding based on their behavioral and cultural actions. The purpose of this study was to identify the community local adaptation strategies in confronting the coastal flooding based on the socio-economic and environmental perspectives in Marunda, North Jakarta, Indonesia. This study uses a narrative review analysis from in-depth interviews, observations, and literature studies. Data analysis includes the stage of action diagnosis and action evaluation. Based on the results, the local adaptation strategy in Marunda community are classified into three phases, namely at the step before, after, and during a flood. These three stages contain elements of physical and social adaptation derived from the ability of the community to remember experiences, learning from experience, and sharing experiences with individuals and other groups. These three abilities help the community to take adaptation actions so that the Marunda community becomes resilient to coastal flood.

Preparing International Joint Project: Use of Japanese Flood Hazard Map in Bangladesh

Both Japan and Bangladesh suffer from floods, and variety of measures have been developed in each country. In addition to the structural measures such as embank-ment, non-structural measures such as flood hazard map and warning system have been developed and used for evacuation effectively in Japan. However, flood hazard map is not a common measure in Bangladesh. In Bangladesh, different measures such as raising/elevating their houses with plinth, placing sand bags on the riverbank and migration are common. The major reason of this difference isbecause of the different flood phenomena. For example, the flood phenomena in Japan is more destructive in short term compared to the flood in Bangladesh because of the difference of the topography. In Japan, the river velocity is fast because of the steep river bed, therefore, even one hit is possible to destroy buildings and deprive of people’s lives sometimes. However, flood in Bangladesh is not able to destroy buildings and deprive of people’s lives in short term. Long inundation period such as a few months makes people impossible to secure food by farming and deprive of human lives by starvation. Thus, understanding the different flood phenomena is the base of starting project. However, many researchers and mem-bers in international joint projects start without noticing the different phenomena and perception toward river and flood. In addition, understanding the background of each country is also needed, since the technology for flood disaster risk reduction have been developed under the social condition of each country. Since the flood in Japan is destructive in short term, Japanese are afraid of flood, thus flood disaster risk reduction has been considerable interest for government and local people. Government has been developing measures and legislation, and local people are cooperative to the government. However, Bangladeshi are not afraid of flood itself, the flood-conveyed fertile soil is even welcome by farmers. They pay attention to the duration of flood, since it is related to the available duration of farming and securing food. Thus, government and local people in Bangladesh did not choose the way of controlling the river flow by structural measures like Japan.

Urban Sprawl in Wadi Goss Watershed (Jeddah City/Western Saudi Arabia) and Its Impact on Vulnerability and Flood Hazards

Today, climate change imposes enormous challenges on a global scale. The interactions of the balances between the need for development, population growth, massive urbanization generate a negative impact on the presence of these climate changes. One of the direct consequences of these changes is the phenomenon of flash floods, a phenomenon that hit the city of Jeddah (city located in west of Saudi Arabia) twice, one in 2009 and the other in 2011, causing significant human and material damage. Floods are considered as a direct result of the combination of extreme weather and hydrological phenomena; in most cases, the magnitude of these floods is magnified by anthropogenic factors, which increases the risk. According to the risk triangle, risk is defined as a probabilistic function that depends on three essential elements: exposure, vulnerability and hazard. If any of these three elements undergo growth the risk also does so and vice versa. Exposure and vulnerability will depend on the presence of human activities in the study area. This study is conducted on the Wadi Goss watershed as it was one of the most violent basins during the 2009 and 2011 floods. Indeed, we present in this study the extent of the urban extension in the Wadi Goss watershed, since 1984 to days and this by the using Landsat images. Given the nature of the study area, we present a method based on the calculation of various indices followed by a classification operation in order to define the urbanized zones inside the Wadi Goss watershed and then estimate the urban sprawl inside the watershed. We also present in this paper, the characteristics of the watershed as well as the evolution of the urbanized areas exposed to the phenomenon of floods and their contribution to the changes of the hydrological behavior of the basin, and to increase the evolution of the risk of the floods. We have shown through this study that the urban footprint has increased from 90 hectares in 1985 to 850 hectares in 2015. This urban footprint represents 12% of the total area of the watershed. Most of the urban evolution was operated on the wadi area with a concentration in the western part of the basin and especially at its outlet.

Strategy of Emergency Response of Flood and Landslide Disaster in Pacitan Regency

Disaster emergency response is an important stage in the process of disaster management in which the action is performed while tackling natural disasters. The goal of the research is to describe the phenomenon of floods and landslides disasters as well as the efforts of emergency response in the event of a disaster in pacitan regency year 2017. Research conducted through a descriptive qualitative approach. Method of data collection with interviews, observation and documentation. As for the data analysis stage include data condensation, data presentation and the final stage, namely the withdrawal of the conclusion. The results showed flooding and landslides diasters in pacitan regency in the year 2017 including big disaster from a series of disasters that have occurred. These categories include national scale natural disaster because there are any victims and damage inflicted is large enough so that the various parties get involved in the handling of the disaster. The process of emergency response in the event of a disaster, led by komadan dandim 0801 military see as commander of the emergency response to natural disasters. Emergency response could be made in learning to cope with disasters that are better realized through disaster prevention and mitigation. Therefore, the overall infrastructure improvements that are vulnerable to disaster-affected and disaster-prone area mapping as well as awareness of stakeholders in the disaster prevention and mitigation very recommended to improve the ability of the community in the face of natural disasters.

A climate vulnerability and impact assessment model for complex urban systems

We present a hierarchical model developed for assessing the climate vulnerability and impact on the urban system to heat wave and pluvial flooding phenomena, which allows measuring the “urban performances” under extreme climate conditions by applying physical, environmental and socioeconomic indicators. The model is structured in five levels, from the knowledge of heterogeneous urban characteristics extracted from different sources to the vulnerability indicators; each level provides a synthesis of the information of the previous level. Moreover, given the complexity of the urban system, the model is based on the identification of three subsystems, in order to gradually synthesize information from one level to another. Each indicator, and the associated data and characteristics, are related to a specific subsystem, which represents technological/environmental (building, open spaces) or socioeconomic dimension (population). Finally, we assess the impacts related to a climate hazard scenario by evaluating the combination of the hazard with the exposure and the vulnerability of the subsystems with which the exposure interacts. We test our method on the study area of East Naples (Italy) by considering heat wave and pluvial flooding climate hazard scenarios; specific functions are performed in a GIS environment to implement the spatial analysis processes need to build the vulnerability indicators and impact scenarios. The results show that the distribution of vulnerability and impacts are related to the local urban context and to the hazard scenario considered. The proposed model can be applied to assess the benefits of adaptive solution design.

The Impact of Monsoon Flood Phenomenon on Tourism Sector in Kelantan, Malaysia: A Review

The northeast monsoon flood phenomenon is a natural disaster especially around East Peninsular Malaysia such as Kelantan. The main objective of this study is to identify the impact of the northeastern monsoon flood of Malaysia on the tourism sector. The climatology factors for tourism sector especially for the coastal zone tourism segment. Large floods as in 2014 have seen a lot of destroying local areas. Both the government and the non-government should formulate strategies to address the flood issue as a process of improvement for the future. Flood effects such as damage to building infrastructure, coastal beauty, facilities, interrupted services and tourist attractions. The findings show that floods that are among the most frequent climate change in all countries in Malaysia. However, the impact of this disaster will not only affect flood-damaged areas but also indirectly affect the growth of the tourism sector as it requires a reconstruction process. The study was conducted to illustrate the impact of the flood disaster that has affected the tourism sector. Â

APPLICATION OF MANAGEMENT OF DISASTER OF FLOODS HAZARDS AND MEANS OF PREVENTION - SAFAGA AREA – EGYPT

The phenomenon of floods considers one of the most critical ecological hazards that may lead into multiple of environmental and human disasters, particularly, to the sustainable development process in the study area; since the forceful inflow of the current waters into valleys turns into a destructive deadly power to the railway stations, roads, and establishments. Hereby, researchers with environment’s risks have had to consider this repetitive phenomenon. The researcher has selected Safaga area to become the study area to examine floods’ hazards and their impact on sustainable development, as floods are one of the most important ecological phenomena burden with environmental risks to the Red Sea governorate, specifically, the study area (Safaga) for being a promising area of future economic growth and for including several risky valleys during floods’ occurrence. In order to set present and future developmental programs, both natural and human risks should be included within the framework of sustainable development to restrict disasters. Geographical Information Systems (GIS) play a significant primary role in floods and their hazards; in the past few years, as the GIS have been capable of providing decision-makers with multiple data that have facilitated management of the disaster, regarding the ability of inquiring and planning for hazards. This research comes out with a selection of approaches for restricting disaster of floods through keeping inhabited areas away from floods and disasters ways, establishing also a group of institutions that would be capable of resisting the expected floods such as bridges and dams; taking into consideration the cost and benefit of these establishments; alleviating this through reducing losses by counting on planning of lands’ utilization in the exposed to-floods areas, particularly, the coastal and defining determinants of directing these uses according to their economic or spatial value. In addition, people should be warned at floods duration through using modern techniques and methods of prediction using the GIS and means of protection from floods’ hazards by seeking the protection establishments in case of inhabited areas such as (Safaga city – the fishermen’ villages – land roads – tourist villages), defining type of risk for each and how to protect it when hazards are highly risky.

Urban growth pattern with urban flood and temperature vulnerability using AI: a case study of Delhi

Urbanisation and its growth patterns are attribute of spatio-temporal changes in an area. Rapid and irreversible urbanization is the primary driver in changing landscape dynamics of the urban areas causing significant damage to the natural ecosystems. Cities in India are experiencing extensive urban growth and change through increasing population, changing social aspects, geographical influence, and increased complexity. This paper aims at modelling urban expansion through agent-based analysis considering the effect on the phenomenon of urban flood and urban heat island formation. Urban pattern analysis was analysed using temporal remote sensing data for the period 2003-2017. The results obtained depict that urban footprint has increased by 49.7% whereas vegetation has decreased by 27% in the study region. The study also identified various zones vulnerable to urban flood and land surface temperature variation in the region. This analysis would aid in managing urban stress and irreversible damages that it may cause to the environment through structural and non-structural measures, which can significantly help in sustainable management of natural resources.

Performance of Retarding Basin in Flood Disaster Risk Mitigation in Welang River, East Java Province, Indonesia

Flood phenomenon caused by high rainfall and sea tides on a watershed seat the tidal area, including the Welang River, commonly occur and the number of events is increasing. Construction of retarding basin is one of flood risk mitigation efforts by reducing the flood peak discharge. Assessment of flood management in Welang River was conducted with hydrology and hydraulic approaches, by using the Hydrologic Engineering Centre-Hydrologic Modelling System (HEC-HMS) 4.0 and Hydrologic Engineering Center–River Analysis System (HEC-RAS) 5.0.3 software. The hydraulic simulation consists of 4 scenarios. Scenario 1 was the current condition, while scenario 2, 3, and 4 were the retarding basin construction with one side spillway, one on the upstream (River Station (RS) 7400), on the middle (RS 6970), and on the downstream (RS 6590), respectively. The height variation of side spillways are 3 m and 4 m. Flood routing simulation result showed that the existing river channel condition could not accommodate of 2-year flood and 10-year flood, which caused peak discharge of 497.7 m3/s and 794.9 m3/s. At the RS 6590, the maximum runoff height of 2-year and 10-year flood were 0.66 and 1.02 m, respectively. Under the 2-year return period of flood, the discharge reduction caused by the retarding basin at control point RS 5341.4 (Karangketug Village), were 39.63 m3/s, 31.83 m3/s, and 41.93 m3/s, respectively for scenario 2, 3 and 4 with the 3 m side spillway height and 14.71 m3/s, 16.76 m3/s, and 13.74 m3/s, respectively for scenario 2, 3 and 4 with the 4 m side spillway height.

Identifying Flood Events over the Poyang Lake Basin Using Multiple Satellite Remote Sensing Observations, Hydrological Models and In Situ Data

The Poyang Lake, the largest freshwater lake in China, is famous for its ecological and economic importance as well as frequent flood characteristics. In this study, multiple satellite remote sensing observations (e.g., GRACE, MODIS, Altimetry, and TRMM), hydrological models, and in situ data are used to characterize the flood phenomena over the Poyang Lake basin between 2003 and 2016. To improve the accuracy of the terrestrial water storage (TWS) estimates over the Poyang Lake basin, a modified forward-modeling method is introduced in the GRACE processing. The method is evaluated using the contaminated noise onboard observations for the first time. The results in both spectral and spatial domains infer a good performance of the method on the suppression of high-frequency noise while reducing the signal loss. After applying forward-modeling method, the TWS derived from the GRACE spherical harmonic coefficients presents a comparable performance with the solution derived from the newly released CSR Release05 mascon product over the Poyang Lake basin. The flood events in 2010 and 2016 are identified from the positive anomalies in non-seasonal TWSs derived by GRACE and hydrological models. The flood signatures also coincide with the largest inundated areas estimated from MODIS data, and the observed areas in 2010 and 2016 are 3370.3 km2 (30% higher than the long-term mean) and 3445.0 km2 (33% higher), respectively. The water levels in the Hukou station exceed the warning water level for 25 days in 2010 and 28 days in 2016. These continuous warning-exceeded water levels also imply the severe flood events, which are primarily driven by the local plenteous precipitation in the rainy season (1528 mm in 2010, 1522 mm in 2016).

Theoretical link between rainfall and flood magnitude

AbstractThe rainfall–run‐off convolution integral is analytically solved for several models for the elementary hydrograph. These solutions can be combined with available rainfall frequency analyses to predict flood flows along streams for different recurrence intervals, using no free parameters for gauged streams and one estimable parameter for ungauged streams. Extreme discharge magnitudes at gauged sites can be typically estimated within a factor of two of actual records, using no historical data on extreme flows. The flow predictions reproduce several important characteristics of the flood phenomenon, such as the slope of the regression line between observed extreme flows and basin area on the conventional logQ versus logA plot. Importantly, for the models and data sets investigated, the storm duration of greatest significance to flooding was found to approximate the intrinsic transport timescale of the particular watershed, which increases with basin size. Thus, storms that deliver extraordinary amounts of rainfall over a particular time interval will most greatly activate basins whose time constants approximately equal that interval. This theoretical finding is supported by examination of the regional hydrological response to the massive storms of September 14, 2008, and April 28–30, 2017, which caused extraordinary record flooding of basins of about 5–100 km2 and 500–4,000 km2, respectively, but produced few records in basins that were larger or smaller than those ranges.

Influence of Boussinesq coefficient on depth-averaged modelling of rapid flows

The traditional Alternating Direction Implicit (ADI) scheme has been proven to be incapable of modelling trans-critical flows. Its inherent lack of shock-capturing capability often results in spurious oscillations and computational instabilities. However, the ADI scheme is still widely adopted in flood modelling software, and various special treatments have been designed to stabilise the computation. Modification of the Boussinesq coefficient to adjust the amount of fluid inertia is a numerical treatment that allows the ADI scheme to be applicable to rapid flows. This study comprehensively examines the impact of this numerical treatment over a range of flow conditions. A shock-capturing TVD-MacCormack model is used to provide reference results. For unsteady flows over a frictionless bed, such as idealised dam-break floods, the results suggest that an increase in the value of the Boussinesq coefficient reduces the amplitude of the spurious oscillations. The opposite is observed for steady rapid flows over a frictional bed. Finally, a two-dimensional urban flooding phenomenon is presented, involving unsteady flow over a frictional bed. The results show that increasing the value of the Boussinesq coefficient can significantly reduce the numerical oscillations and reduce the predicted area of inundation. In order to stabilise the ADI computations, the Boussinesq coefficient could be judiciously raised or lowered depending on whether the rapid flow is steady or unsteady and whether the bed is frictional or frictionless. An increase in the Boussinesq coefficient generally leads to overprediction of the propagating speed of the flood wave over a frictionless bed, but the opposite is true when bed friction is significant.

Spatial Analysis of Land Subsidence and Flood Pattern Based on DInSAR Method in Sentinel Sar Imagery and Weighting Method in Geo-Hazard Parameters Combination in North Jakarta Region

The reclamation program carried out in most cities in North Jakarta is directly adjacent to the Jakarta Bay. Beside this program, the density of population and development center in North Jakarta office has increased the need for underground water excessively. As a result of these things, land subsidence in North Jakarta area is relatively high and so intense. The research methodology was developed based on the method of remote sensing and geographic information systems, expected to describe the spatial correlation between the land subsidence and flood phenomenon in North Jakarta. The DInSAR (Differential Interferometric Synthetic Aperture Radar) method with satellite image data Radar (SAR Sentinel 1A) for the years 2015 to 2016 acquisitions was used in this research. It is intended to obtain a pattern of land subsidence in North Jakarta and then combined with flood patterns. For the preparation of flood threat zoning pattern, this research has been modeling in spatial technique based on a weighted parameter of rainfall, elevation, flood zones and land use. In the final result, we have obtained a flood hazard zonation models then do the overlap against DInSAR processing results. As a result of the research, Geo-hazard modelling has a variety results as: 81% of flood threat zones consist of rural area, 12% consists of un-built areas and 7% consists of water areas. Furthermore, the correlation of land subsidence to flood risk zone is divided into three levels of suitability with 74% in high class, 22% in medium class and 4% in low class. For the result of spatial correlation area between land subsidence and flood risk zone are 77% detected in rural area, 17% detected in un-built area and 6% detected in a water area. Whereas the research product is the geo-hazard maps in North Jakarta as the basis of the spatial correlation analysis between the land subsidence and flooding phenomena.double point.

Numerical analysis of flood with a double grid model

The objective of this study is to verify the validity of a hyper grid type (double grid model) computational model, for calculating flood flows with inundations. Nowadays, detailed information of the bathymetry is available due to improved measurement techniques, such as LP data. However, the number of grid cells used in the computation is limited because of the limitation of computational infrastructures. A double grid approach based on the model proposed by Volp et. al.(2013) is employed to overcome this problem.This model directly uses the high resolution topographic data though the discretization of the governing equations are made on coarser grid. The computational results showed that the present numerical model can compute the large scale flood phenomena efficiently and accurately.

Influence of Horizontal Pipe Length to Flooding of Counter Current of Water-Air Flow in Complex Pipe

This research has been conducted study the effect of horizontal pipe length on flooding phenomenon. Observation of the flow phenomenon has used high speed camera. Working fluids for this study were water-air and the water flow was countercurrent to the air through a hot leg simulator. Hot leg simulator consisted of an acrylic horizontal pipe with inside diameter of 25.4 mm and an elbow with inclination angle of 500. The ratio of length to diameter pipe used in this study L/D = 25, L/D = 50 and L/D = 94.5. Water superficial velocity (JL) were 0.016 m/s, 0.049 m/s, 0.082 m/s. For each water superficial velocity, air superficial velocity (JG) was increased gradually with 0.1646 m/s from 0 m/s until flooding phenomenon appeared. Time interval to change air superficial velocity was 15 seconds. The result of this study was flooding phenomenon appeared earlier for higher L/D, and it was observed that the onset of flooding shifted toward the bend. It was also observed that flooding phenomenon shifted away from the bend for higher JL while L/D kept constant.

Evaluation of the permeability of the dripping zone and of flooding phenomena in a blast furnace

In the current scenario of quality impoverishment of the raw materials charged into blast furnaces, it becomes fundamental to understand the phenomena that directly affect the operational stability of these reactors. This paper evaluated a relationship between pressure drop and irrigation density with the intention of associating them to the flooding phenomena that occur in the dripping zone of a coke blast furnace. It was not possible to clearly obtain a relation between the operational instabilities and the occurrence of flooding phenomena, because there is not a clear separation between the days with and without the operational instabilities. However, over a defined range in the diagram, it is noticeable a higher occurrence of instabilities. Analyzing the parameters, the one with greater influence on the permeability of the dripping zone is the size distribution of the coke, evaluated by the calculation of the harmonic diameter.

The assessment of the coastal vulnerability and exposure degree of Gran Canaria Island (Spain) with a focus on the coastal risk of Las Canteras Beach in Las Palmas de Gran Canaria

The Coastal Vulnerability and Exposure Degree (CVED) of the Gran Canaria Island and the coastal risk of Playa de Las Canteras (Las Palmas de G.C.) have been assessed by means of a GIS analysis. The evaluation of coastal vulnerability (H) has been performed by using two different levels of analysis: the first one regarding the entire Island (Coastal Vulnerability Index method - CVI), the second one regarding specifically Las Canteras Beach, selected for its socio-economic importance (Coastal Vulnerability Assessment method - CVA). The application of the CVI method, based on geologic-geomorphologic and meteomarine data easily available, has allowed the regional scale assessment of coastal vulnerability (H) along the Gran Canaria coastline and, therefore, the individuation of more critical coast stretches deserving further analysis. The application of the CVA method, based on more specific morphologic-sedimentary beach features that allow to consider both the beach retreat due to storm surge and the coastal inundation due to run-up on the beach, has provided a large scale detail on the coastal vulnerability of Las Canteras Beach. Socio-economic and damage indexes have been determined for the 15 coastal municipalities included in the study area and, by means of the resulting matrix product, the degree of exposure (Ex) along the Gran Canaria coast has been assessed. Finally, the combination of coastal vulnerability and exposure levels has allowed to obtain the Coastal Vulnerability and Exposure Degree (CVED) for the entire Island and the risk levels that characterize specifically Las Canteras Beach. Major results in terms of CVED highlight prevailing low vulnerability and exposure levels along the western coast, and overall high vulnerability and exposure levels along the eastern coast, from Las Palmas de G.C. to San Bartolome de Tirajana. The focus made on Playa de Las Canteras has allowed to identify the areas characterized by medium and high risk levels that represent approximately one third (940 m) of the entire beach and are located in its central part. The used two-level analysis approach has proved its efficiency by highlighting the degree of coastal vulnerability along the study coast and, especially, more critical coast stretches (CVI method) such as the Playa de Las Canteras that can be successfully analysed with the CVA approach allowing for a large-scale assessment of risk aspects, essential for a correct definition of priority management strategies. Results obtained with the present study, along with the awareness of the increasing phenomena of coastal erosion and marine flooding arising on the mid-long term due to the effects of global climate change, highlight the need for the competent public administrations of Gran Canaria to develop a strategic approach to coastal management and sustainable development that considers as a whole socio-economic values and natural resources, coastal vulnerability and exposure degree, and risk aspects.