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To understand the change in runoff characteristics of turbid water generated by the large-scale landslides that occurred in the upstream areas of the Monobe River in August 2004 and September 2005, the period 2001 ~ 2011 was assessed. Data analyzed included the secular variation of the SPM (suspended particulate matter) load, the correlation between discharge and turbidity (C-Q relation), and the days when the water turbidity of the river was 10 mg L and over during the river residence period (June to September) of the Ayu (Plecoglossus altivelis altivelis) in the lower reaches of the river. The SPM load, the rate of increase in turbidity during fl oods, and the days of turbidity 10 mg L and over increased after the landslides occurred. These apparent increases due to the landslides were observed between 2004 and 2007. More recently, SPM loads in both 2010 and 2011 were less than 50% of those observed in 2006, although the annual precipitation in both 2010 and 2011 was larger than that in 2006. However, in recent years, the days of turbidity 10 mg L and over have tended to increase again. This was especially apparent for 54 days recorded in 2011, which had the maximum values except for 70 days in 2006. It is clear that large scale landslides induce high water turbidity with long-term persistence. In recent years, the highly turbid water generation has declined gradually, whereas the generation of turbidity that can affect growth of the Ayu has increased. We found that the long-term persistence of turbid water is a severe recurring problem in the Monobe River.

Changes in runoff characteristics of turbid water caused by large-scale landslides in the Monobe River, Japan.