Flood mapping

Floods are one of the most significant devastating natural hazards around the globe. Recent development in remote sensing technology supports faster and low-cost analysis of flood hazards. This study used the Sentinel-1 SAR data for flood mapping and damage assessment. We selected the October 2022 flood event in Thua Thien Hue province, Vietnam.

10p vithomson 02-07-2024 0 0   Download

A Luoi is a mountainous district of Thua Thien Hue province, Vietnam, with rugged terrain, steep slopes, and many valleys. A Luoi district bears many risks of natural disasters such as storms, floods, droughts, and landslides yearly. This study applied the AHP (Analytical Hierarchy Process) model with the GIS tool on the input database of Sentinel-2B Image, DEM, and geographic background data to evaluate the influence of 5 factors: slope, elevation, aspect, land cover, and vegetation to generate a landslide hazard zoning map, scale 1:50,000.

13p dianmotminh02 03-05-2024 1 1   Download

In this study, the flooding situation caused by the groups in the planning period (from 2010 to 2020) will be assessed and mapped by using GIS. The results show that, in the period from 2016 to 2021, flooding by heavy precipitation was more serious than that by tidal current.

15p viellison 28-03-2024 1 1   Download

The study shows the advantages and disadvantages of hydraulic modeling in flood simulation and flood mapping from satellite images. There is a very high potential of using the hydraulic model together with satellite data for flood hazard assessment.

16p viironman 02-06-2023 4 3   Download

The impact of climate change has become stronger in recent years, climate change has increased hydrometeorological disasters in which flooding is one of the natural disaster risks that have a strong impact on the economy. This study uses satellite images, land use map and flooded area of Bac Ninh province data to build a matrix to determine the weight of the vulnerability.

11p viironman 02-06-2023 10 3   Download

Flood is a natural disaster that can cause loss of life and damage to property. The objective of this study is to create a flood map of Yen Bai city, where flood occurs regularly during heavy rain and Thao River's water level rises. The study used Mike Flood model based on the connection of 1D and 2D hydrodynamic models.

10p vimalfoy 08-02-2023 4 2   Download

Hoa Binh is one of the provinces strongly suffering from natural disasters, especially flash floods. High slope mountainous terrains, reduced vegetation cover and unfavorable weather conditions form favorable conditions for flash floods to occur. This article develops a map of flash flood risk zoning in Hoa Binh using remote sensing and GIS technology.

16p vimalfoy 08-02-2023 4 2   Download

The paper proposed a method to build the flood water depth map of Quang Binh province, Vietnam in the historical flood 2020 based on Sentinel1A satellite images. This method is a combination of the classical Otsu method and the proposed spreading method.

9p viharry 15-12-2022 4 2   Download

Flooding is one of the regular natural disasters in Nghe An province and thus monitoring and assessing flood damages have been addressed by the local government and disaster experts. However, the traditional approach to adoption is expensive and time-consuming.

8p viwmotors 13-12-2022 8 2   Download

Flood are some the most destructive and catastrophic disasters worlwide. Thuan Chau is a district of Son La province in the north mountainous region of Viet Nam. In the current study, the main aim is to assess the flash flood map in Thuan Chau district, Viet Nam using GIS technique and AHP method.

3p vianapatricia 10-06-2022 9 2   Download

The best-performing model was the first test, indicating that direct input of the screened parameters was the ideal modelling process. This test had the lowest corrected Akaike Information Criterion (160.01), the highest percentage of deviance explained (46.18%), lowest spatial autocorrelation of residuals (0.1122) and transformed residuals (0.2827), highest success accuracy (91.24%), and second-best prediction accuracy (75.15%).

19p thebadguys 15-01-2022 20 0   Download

The flood susceptible map was generated by merging the slope map and the stream network maps. The results indicate that about 42.59% of the study area were highly prone to flooding. The areas susceptible to flooding were mainly made up of agricultural lands with high usage of chemical fertilizers for farming, which may leach into nearby rivers, streams, lakes and groundwater during flood occurrence.

12p thebadguys 15-01-2022 19 0   Download

In this paper, MODIS satellite images corrected land surface reflectance 8-day and at 500 m spatial resolution are used to produce the time-series of inundated maps in the Lower Mekong River

4p viwendy2711 05-10-2021 12 1   Download

This article has established a flash flood hazard map at a scale of 1/100,000 in Tuyen Quang province. In the map database, districts with a high risk of flash flood were identified, including Na Hang, Chiem Hoa, Ham Yen, and Lam Binh, the average flash flood hazard level included districts: Yen Son, Son Duong; Tuyen Quang city has a low risk of flash floods.

8p viaespa2711 31-07-2021 31 5   Download

An Giang is one of the provinces in the Mekong delta that is greatly affected by flood events, which brings damage and devastation to life and property. This study practices the application of Sentinel-1A images to monitor the distribution of flood depths in the An Giang province in 2019 as well as applies regression correlation and thresholding to scattering value analysis. The research results indicated the exponential regression model on the VV polarization images had correlation coefficients (r) in August, September, and October ranging from 0.8398 to 0.

7p nguaconbaynhay10 29-01-2021 8 3   Download

Flooding caused by historically high flows, especially in Tra Khuc-Ve River basin in the Mid-Central region in Vietnam in November 2013, which caused widespread damage. The purpose of this paper was to establish the inundation maps in the downstream part of Tra Khuc-Ve rivers by using the coupling of the hydrological and hydraulic models (MIKE SHE/MIKE 11 and MIKE 11 GIS). Calibration and validation of the hydrological model were in good agreement in terms of the vibration amplitude, absolute value, and phases.

12p nguyentanloc09 17-10-2020 23 2   Download

Morphometric analysis, which refers to the science of quantitative analysis of land surface, has been carried on Kamleshwar watershed of Hiran River in Gujarat using remote sensing and GIS techniques. Digital Elevation Model of 30 m × 30 m resolution was used to prepare the detailed drainage map in ArcGIS software and stream ordering was in which study area has trunk order of 5. Total seventeen morphometric parameters including linear, areal and relief aspects have been estimated. Mean bifurcation ratio of the watershed has been calculated to be 3.

9p quenchua2 15-12-2019 13 0   Download

Although Egypt has already reached the water poverty limit, it possesses a high potential of brackish groundwater available from different aquifers. All Arab countries lie in the best sun-belt region in the world and Egypt has the highest number of sun hours all year round. Solar energy for groundwater desalination is an independent infinite energy resource; it has low running costs and reduces the contribution of greenhouse gases (GHG) to global warming.

9p kethamoi1 17-11-2019 30 0   Download

Microwave remote sensing or SAR (Synthetic Aperture Radar) data has been employed extensively to map open water bodies and to monitor flood extents, where cloud cover often prohibits the use of satellite sensors operating at other wavelengths. Where total inundation occurs, a low backscatter return is expected due to the specular reflection of SAR signal on the water surface. However, low local incidence angle and wind induced waves can cause a roughening of the water surface which result in a high return signal.

15p vinhsolax 15-09-2019 16 1   Download

This article presents a set of inundation maps corresponding to flood frequencies of 1%, 2%, 5%, 10%, 20% in the Gianh river basin. The results show that flooding happens more frequent in both river banks and downstream areas of Gianh river basin. As Gianh River runs mainly along Tuyen Hoa District, the communes along the river banks of the district are seriously affected by floods.

8p vithomasedison2711 20-08-2019 5 0   Download