Journal of the Japan Society of Erosion Control Engineering 

About: Journal of the Japan Society of Erosion Control Engineering is an academic journal. The journal publishes majorly in the area(s): Debris flow & Landslide. It has an ISSN identifier of 0286-8385. Over the lifetime, 145 publications have been published receiving 4343 citations.

Debris flow following the 1984 eruption with pyroclastic flows in Merapi volcano, Indonesia

Abstract: Merapi volcano which has often erupted with pyroclastic flows is one of the most active volcanoes in Indonesia. Recently, large-scale pyroclastic flows occurred in the southwestern flank of the volcano in June 1984. As a result, the hydrological and erosional regime of the hillslopes was radically altered and more than 203 debris flows and floods have occurred in the Putih river catchment. In this paper, using the records of debris flow in the Putih river catchment, the characteristics of debris flow following the 1984 pyroclastic flows were analyzed. The rainfall conditions not causing debris flow are definitely different between the 4-year period after the 1984 pyroclastic flows and since then. The rainfall intensity not causing debris flow is small just after the pyroclastic flows and then has increased with time. Also, the large-scale debris flows occurred within a 4-year period after the 1984 pyroclastic flows. The magnitudes of debris flows have decreased with time. The sediment outflow by debris flows had almost finished within a 4-year period after the pyroclastic flows.