Evaluating temporal changes in sediment distribution and travel distances from forest roads by a PC-based imagery analysis with digital orthophoto data

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  • デジタルオルソデータを用いた簡易型画像解析法による林道からの流出土砂分布および移動距離の時系列変化評価.

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Many studies have identified forest roads as major non-point source impact contributors of sediment resulting from forest activities in a mountainous environment. Thus, sediment deposits on slopes below roads have made an important environmental issue in management approaches to riparian zones because of the numerous ecological linkage between terrestrial and aquatic ecosystems. This paper demonstrates a PC-based imagery data processing system using digital orthophoto throughout the application to estimate the granitic sediment deposits eroded from constructed roads on watersheds in the mountains of Shiga Prefecture. The results showed the same trends in sediment yield as earlier studies, it was documented that large areas of sediment deposits during the earlier years after road construction were followed by a rapid reduction in deposits in subsequent years. Also, a relationship was developed to describe the percent in area of the sediment accumulated on the slope in relation to the travel distance in travel.

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