ИСТИНА

The research focuses on the sediment transport of rivers draining slopes of Avachinsky volcano which is located on Kamchatka peninsula. As far as no long-term hydrological data is available for the rivers draining volcanoes, the main purpose is a field-based assessment of water and sediment discharges within case study river length is about 25 kilometers. Sediment transport is determined by diurnal, within-year and long-term regime of water flow fluctuations originated from seasonal/daily weather changes under strong impact of local petrology anomalies and intensive groundwater seepage. The study focuses on integrative approach to study sediment transport in catchment-river scale. Field approach is based on water discharges, levels, suspended sediment concentration, turbidity, sediment load measurements at the gauging station 4-12 times daily depending on hydrological condition in 2007, 2010, 2012-2014. Sediment budget model concern the soil erosion and volcanic landslides into account and compute the surface runoffs and sediment runoff to simulate the long-time scale movement. SedNet, WEPP and USPED were run to calculate the sediment budget in the basin. The integrated results based on empirical field data and model outputs revealed that suspended sediment discharge variates from 675 to 448 t/year along the length of the river. USPED modelling results show that main erosion fields connected to volcano’s slopes characterized by very steep slopes (more then 40 degrees).