Analysis of Chao Phraya Delta Structure and Change

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วรเมธ ศรีวนาลักษณ์
ดนัย ทายตะคุ


The Chao Phraya Delta is a result of fluvial process and deposit. In the rainy season, the whole area is covered by the water. And after the rainy season ends, the water has disappeared. This seasonal flood brings the abundance to this area. But in the present, the development in this area such as the urbanization, the flood wall protection project including the irrigation development project that are the cause of the Chao Phraya Delta’s water regime changes.
This study has a purpose to analysis the Chao Phraya Delta structure and studies the landscape change in the Chao Phraya Delta by using the geographic information system (GIS) and satellite image analysis. The process to analyze the satellite image include color composition and image enhancement by band operation. Band operation that uses in this study is Normalized Built-up Area Index to enhance the built-up area and detect the land cover change to define the problem that is the result of landscape structure change
The result of this study is the urban area is explored into the lowland. The land cover had changed from the paddy field to the built-up area. So, it reduces the catchment area where floods can be diverted and mitigated. Moreover, the irrigation development has separated the area like a polder to water management. It blocks the flood flow and controls the excess flows to be concentrated in the irrigation or drainage channel. These are a cause of the flood inundation became a flood disaster in this area. So, the development in Chao Phraya Delta, the issue that should be considered is the space for the flood to make an urban that related to the dynamics of this area.

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