Earth Observation System-Based Impact Assessment of 2012 Flood in Delta State Nigeria

E. AhuchaoguUdo., O. C. Ojinnaka, E. NjokuR., Baywood C.N
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Abstract

Flooding is one of the most serious natural hazards in the world. It has become a common natural disaster which has claimed many lives, displaced millions and resulted to the destruction of properties and degradation of contiguous farmland.  Though over the decades the people of Delta state have had to contend with sporadic overflows from the river but not in the scale of 2012 flood event. Flood in 2012, submerged coastal villages, displaced millions of people, submerged several square kilometers of land,  disrupt economic activities and properties worth of millions of naira was lost. This study was provoked based on the fact that since the disaster, no reliable investigation and inventory has been made as a guide for mitigation for future occurrence. Currently Earth observing system (EOS) is gaining popularity in solving many environmental problems due to its accurate and timely delivery of information required for decision making. Therefore the aim of this study was to determine the impact of 2012 flood in delta state.  Pre-flood and flood imageries captured by and Moderate Resolution Imaging Spectroradiometre (MODIS), Land sat imagery with resolution 30m, SRTM with resolution 30 arc second, questionnaire, interview, Global positioning system (GPS)  and geographic information system (GIS) was used for data collection and analysis. The map generated from the non-flood image captured on 20th October 2010 was used as a reference to determine the extent of flooding from the disaster image. Spatial impact was determined based on the extent of the submerged land territory while physical economic impact was measured based on property damages. This study revealed that a total landed area of 2185Sq.kms was covered by flood excluding the original extent of the river. Further assessment  revealed that 785000 people were affected, crops worth’s 3.1 billion naira were destroyed, 231 communities in 12 local government of the 25 local government areas were adversely affected these include 118 communities market, 743 market stalls, 220 primary schools, 84 secondary schools, 435 fish farms, 526 poultry farms, 58 piggeries and 5099 houses. Keywords: key words, MODIS, SRTM, Flood,  Hazard, Imagery DOI : 10.7176/CER/12-9-08 Publication date :September 30th 2020
基于地球观测系统的2012年尼日利亚三角洲州洪水影响评估
洪水是世界上最严重的自然灾害之一。它已成为一种常见的自然灾害,夺去了许多人的生命,使数百万人流离失所,并造成财产的破坏和相邻农田的退化。虽然在过去的几十年里,三角洲州的人民不得不与河流的零星溢流作斗争,但没有发生2012年洪水事件的规模。2012年的洪水淹没了沿海村庄,数百万人流离失所,淹没了几平方公里的土地,破坏了经济活动,价值数百万奈拉的财产损失。这项研究是基于这样一个事实,即自灾难发生以来,没有进行可靠的调查和盘点,作为未来发生的减灾指导。目前,地球观测系统(EOS)由于其准确、及时地提供决策所需的信息,在解决许多环境问题方面越来越受欢迎。因此,本研究的目的是确定2012年洪水对三角洲州的影响。采用中分辨率成像光谱仪(MODIS)拍摄的洪水前和洪水影像、分辨率为30m的陆地卫星影像、分辨率为30角秒的SRTM影像、问卷调查、访谈、全球定位系统(GPS)和地理信息系统(GIS)进行数据收集和分析。从2010年10月20日拍摄的非洪水图像生成的地图被用作参考,以确定灾害图像中的洪水程度。空间影响是根据被淹没土地的范围来确定的,而物理经济影响是根据财产损失来衡量的。该研究显示,陆地总面积为2185平方公里。KMS被洪水覆盖,不包括原来的河流范围。进一步评估显示,78.5万人受到影响,价值31亿奈拉的作物被毁,25个地方政府区的12个地方政府的231个社区受到不利影响,其中包括118个社区市场、743个市场摊位、220所小学、84所中学、435个养鱼场、526个家禽养殖场、58个养猪场和5099所房屋。关键词:MODIS, SRTM,洪水,灾害,影像DOI: 10.7176/CER/12-9-08出版日期:2020年9月30日
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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