Shape complexity dynamics of bangladesh delta
In the next interglacial stage, with rising sea level, the rivers were in the degradational or valley filling stage.
Masters Thesis, Lund University, Sweden Schwimmer RA A temporal geometric analysis of eroding marsh shorelines: can fractal dimensions be related to process? It has been estimated that the Bengal coastlines have been moving in a south eastern direction since the early mid-Holocene Islam The largest delta has existed since early Tertiary stage 50 million years ago Anwar Demographic projections suggest that by the area will have an ageing stable or declining population, somewhere between 11 and 14 million people with migration and mobility critical drivers of demographic outcomes. The history of the delta complex can be understood in terms of Gondwanaland break-up, Indian plate movement, collision of the Indian plate with the Burmese and Eurasian plate, development of the huge mountain range of the himalayas , development of the Ganges-Brahmaputra river system and sea level changes in several historical periods and tectonic activities over millions of years. For example, in the urban areas of GBD, including the megacity of Dhaka, rapid population growth has been associated with environmental degradation; including wetland vegetable cover reduction and fragmentation of landscape Dewan et al. For the better management and stability of a delta the hydraulic structural engineering and non-structural environmental engineering features are indispensable for applied engineering solution and sustainability concept. Adopting a systems-based approach of this scale is challenging but essential to support the effective management of coastal Bangladesh. The proto-delta
The deltaic coastal geomorphology of Bangladesh characterized its funnel shaped, vast network of rivers, strong tidal and wind action as well as an enormous river discharge laden with bed, and suspended sediments Islam Between andpeople were killed due to floods in the Mekong delta region Central Committee for Flood and Storm Control These three functions are providing socio-economic benefits to the local communities and stakeholders around the wetlands Fig.
The study area considered for this research, shown in Fig.
The following aspects are the most important subjects that should be considered as a high priority basis and these should be urgently implemented in the Ganges deltaic floodplain regions between Bangladesh and India such as: Delta related data bank development and monitoring system modernized.
The social mechanisms are manifest in measurable outcomes: notably the material well-being and incomes of populations, their nutritional status and health outcomes and, in so-called subjective well-being, how people perceive their present and futures Camfield et al.
Bengal delta map
Our present study is mainly on the islands of central and western coastal regions. The fresh and saline water wetland ecosystems are under threat, because of water quality degradation. This [t2] delta is formed at the confluence of Ganges-Brahmaputra-Meghna river system and their respective tributaries. This scientific body of evidence further shows that the well-being and health status of populations coming from ecosystem services do not depend on individual elements of ecosystems, but rather on bundles of ecosystems that collectively produce desirable and socially useful outcomes. The rice production in the southwestern region of the Ganges delta has been extremely reduced: the output of rice production in was , metric tons, whereas the present production rate has been decreased to three times in Islam and Gnauck It is bordered by the Indian Shield in the west, the southern margin of the barind tract in the north, and the tippera surface in the east. The method for calculating this number utilizes one or more of the geometric parameters of the region being measured, such as area or perimeter Elizabeth Wentz. Geogr Anal — The research reported here builds on those principles, striving to make the science as useful and salient as well as practical. As discussed in detail by the Lancet Commission on Health and Climate Change, the environmental impacts on human health, and thus, mortality rates are likely to be exacerbated by climate change. Land use and population distribution in the delta have also been changing rapidly over the past few decades, in particular a growing urban population in major cities such as Dhaka and Chittagong and Kolkata in neighbouring India and land use changes such as expansion of export-led saline shrimp aquaculture.
In Vietnam, life expectancy was The Ganges—Brahmaputra—Meghna Rivers, carrying sediments and particles, were delivered at the beginning of the glacier period and due to the heavy rainfall, the subarial part of the Ganges—Brahmaputra—Meghna Delta started to form around BP Goodbred and Kuehl Flood monitoring, mitigation and management of flood impacts are very essential in the deltaic floodplain regions.
The evolution of the Ganges—Brahmaputra—Meghna Rivers Delta GBMRD ecosystem contains six spheres in the floodplain, such as 1 the natural and fluvial environment, 2 wetlands environment, 3 coastal aquatic and mangrove environment, 4 the agricultural and settlement environment, 5 the culture and heritage environment, and 6 socio-economic environment Costanza et al.
A livelihood is sustainable when it can cope with and recover from stress and shocks, maintain or enhance its capabilities, assets both now and in future, all while not undermining the natural resource base. However, the delta building activities worked rigorously during the Tertiary and the Quaternary periods of the Cenozoic Era.
Shape complexity dynamics of bangladesh delta
This gives a strong sense of ownership of the research in Bangladesh. An ecosystem is a dynamic complex of plant, animal, and microorganism communities and the nonliving environment interacting as a functional unit. The anthropogenic influences on the wetlands resources in 15 recognized sites, which has been already marked with a red list. Open image in new window Fig. Conforming to the occupation of several river courses and shifting depocentres, the total deltaic coastline can be generalised as the western inactive delta and the eastern active Meghna deltaic plain. According to the formation and development of delta, the Ganges—Brahmaputra—Meghna Delta can be divided into three major categories, which are such as 1 development stages, 2 quaternary deltaic arcs and 3 recent Ganges—Brahmaputra—Meghna Delta. Masters Thesis, Lund University, Sweden Schwimmer RA A temporal geometric analysis of eroding marsh shorelines: can fractal dimensions be related to process? In general the local and indigenous communities are directly dependent on the wetlands resources in the Ganges—Brahmaputra—Meghna Deltaic floodplain. Wetlands ecosystem management in the deltaic floodplains The Bengal basin is one of the largest geosynclines in the world. It should be stressed that Bangladesh as a country has achieved a significant progress in a number of health indicators, despite its relatively poor economic situation Chowdhury et al. A key feature of the process was the reliance on irreversible methods of contraception, such as female sterilization. As per the above-mentioned report, the net migration rates in the Mekong delta region are the same for males and females. Finally, in the Amazon delta region, this decline was even more rapid, although an average household is larger than in the Mekong delta region.
Rather aquaculture is co-located with areas of persistent poverty, with the health and economic well-being of associated populations being negatively affected by salinisation Amoako Johnson et al.
The delta areas of Bangladesh are densely populated, with a predominance of agricultural activities due to the high fertility of the soils.
Bangladesh coastal management case study
So the deltaic floodplain ecosystem services are associated with a range of benefits for human lives and livelihoods. On its northeastward migration, the Ganges built several deltas and then abandoned them before finally occupying its present position. Control the channel migration process within a hydraulic engineering structure and mechanism. Table 4. Land use and population distribution in the delta have also been changing rapidly over the past few decades, in particular a growing urban population in major cities such as Dhaka and Chittagong and Kolkata in neighbouring India and land use changes such as expansion of export-led saline shrimp aquaculture. The Sundarbans are an important buffer against cyclones, but are threatened by sea-level rise and other stresses e. The difficulty of categorizing and quantifying these migration trends is related to the fact that a large proportion of migration includes circular movements Padoch et al. Figure 1 3. Modern delta Numerous islands are located in this region. The dynamics of deltaic social-ecological systems are such that trends are not easily identifiable if simple deterministic relationships are assumed.
based on 74 review