spatiotemporal changes of water logged area in south-western...

Spatiotemporal Changes Of Water Logged Area In South-Western Bangladesh

Md. Rejouanul Islam1, Zia U Ahmed2, Main Uddin Miah1, Hasan M Abdullah1*1Department of Agroforestry and Environment, Bangabandhu Sheikh Mujibur

Rahman Agricultural University, Gazipur-17062International Maize and Wheat Improvement Center, CIMMYT

Email: hasan.abdullah@bsmrau.edu.bd

Coastal Zone Management

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Background of the Study

Water-logging is one of the major environmental problems in

the south-western part of Bangladesh

Riverbed siltation along with back water effect due to sea-level

rise and high tide is leading to prolonged water-logging in this

area

Aquaculture also play an important role

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Crop damage

Shrimp farm

Saline water

intrusion

Water logged

Salinity

buildup

Cause & Effect cycle

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Sequential visualization of water logged area using Landsat Imagery

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Methodology

To carry out this change detection, Landsat imageries from

1973, 1989, 1995, 2000, 2005, 2010 and 2015 were used

Training datasets were generated in ArcGIS environment to

classify the satellite imagery

Supervised classification was done using Random Forest

Algorithm

A post classification comparison or change detection was

followed to calculate transformation of waterlogged area

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Training data collection location

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Results and Discussion

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Existing land use and land

cover of Satkhira In 2015

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0 20000 40000 60000 80000 100000 120000

Acerage (H

a)

2015 2010 2005 2000 1995 1989 1973

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The study demonstrated that waterlogged area increased by63% (1989), 80% (1995), 247% (2000), 360% (2005), 427%

(2010) and 276% (2015) compared to baseline (1973)

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Thank you!!