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The Wenchuan earthquake of May 12, 2008, generated a significant amount of loose solid material that can produce devastating debris flows. In the five years since the earthquake, there have been many large-scale individual and group catastrophic debris flows that have caused lots of damage to the resettled population and the reconstruction efforts. The reconstructed towns of Yingxiu, Yinxing and Miansi have suffered debris flows and other secondary disasters in the past five years and are still not out of danger in the future. A debris-flow catastrophic event hit four towns of Wenchuan County along the Duwen Highway, part of China’s National Highway 213, at midnight on July 10, 2013, following a local extreme rainfall of 176.2mm 24h-1. The debris flows occurred simultaneously along seven gullies. A total of 15000 people were affected due to the destruction of resettlement areas, factories, power stations, and houses. Because of this devastating event, traffic along the Duwen highway was completely disrupted during the disaster and recovery period. The present study focuses on the Lianshan Bridge debris flow gully; the disaster characteristics and cause of the debris flow were analyzed based on field investigations, remote sensing interpretation, and laboratory experiments. The particular dynamic parameters of the debris flow were calculated and analyzed including density, velocity, discharge, total volume and impact force. Also, the dynamic processes and changes that occurred in the debris flow were examined, and the block and burst characteristics of debris flow were studied based on statistical calculation and analysis dynamic characteristic parameters of debris flow. Finally, a program to prevent further debris flow was proposed according to the on-site investigation and based on the analysis of the features and dynamic processes of the debris flow.  Resumen El terremoto de Wenchuan, el 12 de mayo de 2008, genero una gran cantidad de material solido suelto que puede producir flujos de detritos devastadores. En los anos posteriores al terremoto han ocurrido deslizamientos a gran escala individuales y simultaneos que han causado dano a los habitantes reubicados y a los esfuerzos de reconstruccion. Las ciudades reconstruidas de Yingxiu, Yinxing y Miansi han sufrido flujos de detritos y otros desastres secundarios desde el terremoto, y no estan exentas de eventos futuros. Un evento simultaneo de flujo de detritos afecto a cuatro localidades del condado de Wenchuan, a lo largo de la autopista de Duwen, parte de la carretera nacional 213, en la medianoche del 10 de julio de 2013, despues de una lluvia extrema de 176,2 mm 24h-1. Los movimientos de detritos ocurrieron en siete pendientes. Un total de 1500 personas resultaron afectadas debido a la destruccion en areas de reasentamiento, fabricas, estaciones electricas y viviendas. Debido a este devastador hecho, el trafico de la autopista Duwen estuvo interrumpido durante el periodo del desastre y mientras se recuperaba la zona. Este estudio se enfoca en el deslizamiento del Puente Lianshan, donde se analizaron las caracteristicas y las causas del flujo de detritos basados en investigaciones de campo, interpretacion de deteccion remota y experimentos de laboratorio. Se calcularon y analizaron los parametros dinamicos particulares del flujo de detritos como la densidad, velocidad, descarga, volumen total y fuerza de impacto. Tambien se analizaron los procesos dinamicos y los cambios que ocurrieron en el flujo de detritos, al igual que se estudiaron las caracteristicas de bloqueo y ruptura del flujo con base en calculos estadisticos y analisis de los parametros dinamicos caracteristicos. Finalmente, se propone un programa para prevenir mayores movimientos de detritos de acuerdo con la investigacion de campo y basado en los analisis de las caracteristicas y procesos dinamicos del flujo de material solido suelto.

Case Study of the Characteristics and Dynamic Process of July 10, 2013, Catastrophic Debris Flows in Wenchuan County, China