Illgraben

The Illgraben is a 10 km² steep side valley located in Switzerland. This active debris flow catchment supplies 5-15% of the total sediment load of the Rhône River upstream of...伊尔格拉本（Illgraben）是一处面积达10平方千米的陡峭支谷，坐落于瑞士境内。该活跃泥石流集水区为……上游的罗讷河贡献了其总泥沙负荷的5%至15%。