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Gravel-Bed Rivers: Processes, Tools, Environments presents a definitive review of current knowledge of gravel-bed rivers, derived from the 7th International Gravel-bed Rivers Workshop, the 5-yearly meeting of the world’s leading authorities in the field. Each chapter in the book has been specifically commissioned to represent areas in which recent progress has been made in the field. The topics covered also represent a coherent progression through the principal areas of the subject (hydraulics; sediment transport; river morphology; tools and methods; applications of science). Definitive review of the current knowledge of gravel-bed rivers Coverage of both fundamental and applied topics Edited by leading academics with contributions from key researchers Thoroughly edited for quality and consistency to provide coherent and logical progression through the principal areas of the subject.
In mountainous areas, due to the unique geological and topographical conditions, and along with the impact of global climate change, extreme rainfall events often occur and induce natural disasters such as flash floods, debris flows, landslides, dammed lakes and others. These water-related natural disasters (WRNDs) frequently occur around the world, such as the July 29th 1998 debris flow and landslide dam at Capricorn Creek in Mount Meager Volcanic Complex (southern Canada), the flash flood of 20th August 2018 in Raganello Gorge (southern Italy), and the 2007 summer floods in the United Kingdom. WRNDs are more serious in Southeast Asia particularly in Southwest China, where many places suffer from such disasters in the flood season every year, such as the May 20th 2012 flash flood/debris flow among the hit area of Wenchuan earthquake, the June 24th 2017 Xinmo Catastrophic landslide in Mao county and in 2018 the two sequential landslide-dammed lake events at Jinsha River. These WRNDs not only cause heavy casualties and property losses but also destroy the ecological environment. These WRNDs are not only the concern of government managers and engineers, but also deserve more in-depth study from researchers. Formation and evolution mechanisms of WRNDs are very complicated, and influenced by several aspects, such as geological and topographical conditions, hydrometeorological conditions, geomaterial properties, rainfall history and flow condition, and others. Field and laboratory tests can help us to better understand the related mechanism behind the disasters. Theoretical and empirical models, modeling and numerical methods can provide more reasonable evaluation and forecasting results of WRNDs, but a more in-depth understanding is needed. Furthermore, for the risk control and hazard prevention and mitigation, new equipment and technologies have been developed and have achieved some progress in recent years, but the fast and effective emergency treatments for WRNDs need more attention.
Published by the American Geophysical Union as part of the Geophysical Monograph Series, Volume 107. Bedrock river channels are sites of primary erosion in the landscape, fixing the baselevel for all points upstream. This volume provides for the first time an integrated view of the characteristics and operation of this important, though hitherto neglected, class of channels. Examples are provided from several continents and cover a wide range of spatial scales from the large river basins (such as the Colorado River in the United States and the Indus River in Pakistan) down to reach scales and individual sites. Likewise the geologic timescales considered range from erosion and transportation during individual flows to accumulated effects over periods of tens of millions of years.
Interpreting spatial patterns in rates of fluvial incision from river channel elevation long profile data requires an assumption that tectonic uplift rate governs river channel slope. However, application of the most mechanistically explicit description of river incision [Sklar and Dietrich,2004] suggests that sediment flux and sediment grain size, not rock uplift rate, control river channel slopes in many settings. Because it is usually difficult to independently constrain sediment supply, tectonic interpretations of river elevation long profiles are necessarily uncertain. Here we exploit a natural experiment in Boulder Creek, a ~ 30 km2 drainage in the Santa Cruz Mountains,CA USA in order isolate the affect of grain size and relative sediment supply on river channel slope in an actively uplifting landscape along a restraining bend in the San Andreas Fault.