河川植生域に対するローカルリモートセンシング技術の計測精度の比較

抄録

One of the difficult issues in river management in Japan is the treatment of overgrown vegetation developed especially on flood plain, because the vegetation zone sometimes provides natural environment comfortable for birds or small creatures, which makes it difficult to clear the vegetation for improving the flood flow efficiency. However, it is obvious that leaving the overgrown vegetation cause flooding due to the increase of flow resistance by the trees; therefore, it is required to establish an appropriate vegetation management scheme. In order to estimate the effects of vegetation with a reasonable accuracy by using a numerical simulation model, detailed information on vegetation such as vegetation distribution, densicy and height of trees, type of vegetation are necessary. In the present study, four types of local remote sensing techniques are used for measuring a river reach downstream of the Ichikawa River, where vegetation zone has developed on the floodplain and compare the accuracy and features of each method.