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River is an artery and simultaneously a vein of human activity of river basin, and we have to conserve river ecosystem to expect its ecological function for sustainable human life there. However, we have degraded river environment through rapid development in floodplain. In order to make our efforts vital, it is important to understand the structure and function of river ecosystem. In this paper, we focused on denitrification as one of the ecosystem function in the sand bar landscape possesses and its temporal change with landscape transition and change of human activity along a river. The objective of this study was to develop a model that could be used to examine how the nitrogen is trapped and retained by several elements of a sandbar in an alternate bar reach. We also developed a framework to analyze the temporal change in the denitrification by using a numerical simulation, aerial photos, and a water quality information system. The main results of this study are that the temporal change in the denitrification ecosystem function in a sandbar reach can be quantified using the proposed model and the denitrification activity has increased over the past 34 years

Ecosystem Function of Sand Bar Segment in Sandy River with Particular Reference to Denitrification Potential