ESTIMATION OF SEDIMENT RUNOFF CONTROL USING CHECK DAMS AFTER REMOVING DEBRIS BASED ON NUMERICAL SIMULATION

• Published in: PROCEEDINGS OF HYDRAULIC ENGINEERING Vol. 50; pp. 901 - 906
• Main Authors: HONDA, Naomasa, OKUMURA, Takenobu
• Format: Journal Article
• Language: English
• Published: Japan Society of Civil Engineers 2006
• Subjects: check dam; one-dimensional numerical simulation; removing debris; sediment runoff control
• ISSN: 0916-7374; 1884-9172
• DOI: 10.2208/prohe.50.901

We discuss the estimation of sediment runoff control using check dams based on the results of the numerical analysis of a model torrent and an actual one. A one-dimensional numerical simulation is conducted in order to investigate variations in debris flow characteristics along a river reach with check dams. In the calculation, the check storage area is either filled with sediment or emptied by removing debris. The analytical results show that check dams are effective for reducing sediment transport when the initial bed slope of the deposition area at the upstream region of the dam is milder than that of equilibrium slope of debris flow, even if the area is filled with sediment. Removing debris from the check storage is much more effective for controlling debris flow, but the priorities for removing works for a number of check dams must be carefully determined when considering the sediment runoff process and characteristics throughout the torrent.