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Flood Risk Measuring under the Flood Protection Embankment Construction in Dhaka Metropolitan Zone

机译:达卡都市圈防洪堤建设下的洪水风险测度

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The flooding is a common feature for problem solution in rapidly urbanizing Dhaka city. In this research, evaluation of flood risk of Dhaka city in Bangladesh has been developed by using an integrated approach of GIS, remote sensing with socio-economic data. The purpose of the study is to evaluate the flooding risk concerning with the flood protection embankment in remarkable flooding events (1988, 1998 and 2004) and urbanization of Dhaka metropolitan zone. In this research, we considered the Dhaka city into two parts east Dhaka where is outside the flood protection embankment and west Dhaka where is inside the flood protection embankment. Using statistical data we explored the socio-economic status of the study area population by comparing density of population, land price and income level. We have drawn the cross section profile of the flood protection embankment into three different points for realizing the flooding risk in the study area, especially in the historical flooding year (1988, 1998 and 2004). According to the physical condition of the study area, the land use/land cover map has been classified into five classes. Comparing with each land cover unit, historical weather station data and the socio-economic data the flooding risk has been evaluated. Although various adaptation strategies for prevention infrastructure was developed on basis of 1988 memorial flood. As a result, urban area expansion has driven by infrastructure development by 10% and population growth by 5% inside the embankment area. The socio-economic development such as; the average total income inside of embankment has been increased 10 USD while the income outside the embankment remain same.
机译:在达卡市快速城市化过程中,洪水是解决问题的常见特征。在这项研究中,孟加拉国达卡市的洪灾风险评估是通过使用GIS与社会经济数据的遥感综合方法开发的。这项研究的目的是评估在达卡大都市区(1988年,1998年和2004年)发生严重洪水事件和城市化过程中与防洪堤有关的洪水风险。在这项研究中,我们将达卡市分为防洪堤防以外的达卡市东部和防洪堤防内部的达卡市西部两部分。通过比较人口密度,土地价格和收入水平,我们使用统计数据探索了研究区域人口的社会经济状况。我们将防洪堤的横截面轮廓划分为三个不同的点,以实现研究区域(尤其是历史洪水年度(1988、1998和2004))的洪水风险。根据研究区域的物理条件,土地使用/土地覆盖图已分为五类。与每个土地覆盖单位,历史气象站数据和社会经济数据相比较,已经评估了洪水风险。尽管在1988年纪念洪水的基础上开发了各种预防基础设施的适应策略。结果,在堤防区内,基础设施建设增长了10%,人口增长增长了5%,城市面积的扩大得到了推动。社会经济发展,如;路堤外的平均总收入增加了10美元,路堤外的平均收入保持不变。

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