Flood

Dhaka, the capital city of Bangladesh, is surrounded by distributaries of two major rivers, Brahmaputra and Meghna. The city has been subjected to periodic flooding since its early days due to these river system and low topography. Flooding of the city is mainly caused by spillover from surrounding rivers as well as internal water logging problems throughout of the city. Flood mitigation is an important issue in land use planning. Remote sensing could provide timely and low-cost information on floods and land use status whereas GIS is an excellent tool in handling information in land management and flood mitigation. This study was carried out to use remote sensing and GIS technologies to create flood vulnerability map of Dhaka city. Landsat TM data was used to generate a land cover, and JERS-SAR andADEOS-AVNIR data were combined to map flooded area in a normal flood event. Combining them with population data a population distribution map was produced according to…

Flood hazard maps were developed using remote sensing (RS) data for the historical event of the 1988 flood with data of elevation height, and geological and physiographic divisions. Flood damage depends on the hydraulic factors which include characteristics of the flood such as the depth of flooding, rate of the rise in water level, propagation of a flood wave, duration and frequency of flooding, sediment load, and timing. In this study flood depth and "flood-affected frequency" within one flood event were considered for the evaluation of flood hazard assessment, where the depth and frequency of the flooding were assumed to be the major determinant in estimating the total damage function. Different combinations of thematic maps among physiography, geology, land cover and elevation were evaluated for flood hazard maps and a best combination for the event of the 1988 flood was proposed. Finally, the flood hazard map for Bangladesh and a flood risk map for the…

Flood hazard maps were developed using remote sensing (RS) data for thehistorical event of the 1988 flood with data of elevation height, and geological andphysiographic divisions. Flood damage depends on the hydraulic factors whichinclude characteristics of the flood such as the depth of flooding, rate of the rise inwater level, propagation of a flood wave, duration and frequency of flooding,sediment load, and timing. In this study flood depth and "flood-affected frequency"within one flood event were considered for the evaluation of flood hazard assessment,where the depth and frequency of the flooding were assumed to be the majordeterminant in estimating the total damage function. Different combinations ofthematic maps among physiography, geology, land cover and elevation wereevaluated for flood hazard maps and a best combination for the event of the 1988flood was proposed. Finally, the flood hazard map for Bangladesh and a flood riskmap for the…

Floods are a common disaster in many parts of the world. It is considered to be the most common, costly and deadly of all natural hazards. Flooding is not just confined to certain region of the world but is a globally pervasive hazard. India experiences one of the highest incidences of Flood, and the area subjected to it is estimated to be one-eight of the geographical area (0.410 M km2) and have been occurring almost regularly each and every year.

Among the several states prone to flooding, Orissa state is one of them, which is mainly due to the existence of Mahanadi delta system. Studies have been carried out related to understand dynamic processes and the flooding problem in Mahanadi river system in the past. In this study, Daya river system, which is a part of Mahanadi Delta and which is one of the most flood prone areas in Orissa is selected. Heavy monsoon rainfall and congestion of drainage pattern in the river system are considered to be the main cause of…

Floods and associated landslides account for the largest number of natural disasters and affect more people than any other type of natural disaster. With the availability of satellite rainfall analyses at fine time and space resolution, it has also become possible to mitigate such hazards on a near-global basis. In this article, a framework to detect floods and landslides related to heavy rain events in near-real-time is proposed. Key components of the framework are: a fine resolution precipitation acquisition system; a comprehensive land surface database; a hydrological modeling component; and landslide and debris flow model components. A key precipitation input dataset for the integrated applications is the NASA TRMM-based multi-satellite precipitation estimates. This dataset provides near real-time precipitation at a spatial-temporal resolution of 3 h and 0.258 x 0.258. In combination with global land surface datasets it is now possible to expand regional hazard…

Flooding is one of the most destructive natural hazards, accounting for over a third of all disaster damage worldwide. In particular inless developed countries (LDCs) this is typically attributed to poor planning, lack of warning systems and limited awareness of thehazard. A number of flood risk models have been developed, but have as yet contributed little to mapping and quantifying the risk inLDCs, for several reasons. In addition to limited human and technical capacity, these models require considerable amounts ofcurrent spatial information that is widely lacking, such as landcover, elevation and elements at risk basedata. Collecting those withground-based methods is difficult, but remote sensing technologies have the potential to acquire them economically. To account forthe variety of required information, data from different sensors are needed, some of which may not be available or affordable.Therefore, data interchangeability needs to be considered.Thus we test…

Tsunami occurred on December 26th, 2004 and caused heavy losses of lives and properties along the western coast of Thailand, especially in the six provinces along the Andaman Sea. In order to prepare for such unpredictable natural disaster, Tsunami Warning System Committee agreed to establish tsunami warning towers in the six provinces along the Andaman coastline as the first priority. GISTDA utilized LANDSAT and IKONOS satellite images along with GIS to locate the most suitable sites for tower installation. Factors that were taken into consideration in locating the sites include the risk of the area for tsunami, effectiveness of tower working range and the towers must not block the good view of scenery. The Committee then selected the sites and has established three tsunami-warning towers in Phuket, which have been in operation since April 2005. Each is located 3 km apart from each other and can broadcast within 1.5 km range. In summary, satellite images are extremely…

Massive flooding that has swept through Queensland, Australia, and claimed at least one life will likely force the evacuation of at least 1,000 people

Source: GLIDEnumber,

More news: BBC

Floods in South-Central Vietnam have cost the lives of 29 people and more than 39,212 flooded or damaged houses. As of this morning, a low pressure zone in the East Sea has strengthened into a tropical depression causing strong winds and medium to heavy rain in provinces from Thua Thien - Hue to Binh Dinh in the next 24h.

Source: GLIDEnumber

305 families affected by heavy rains that destroyed their homes in Aragua state and caused landslides.

Source: GLIDEnumber