Dynamics

Download Catchment Dynamics and River Processes: Mediterranean and by Celso Garcia and Ramon J. Batalla (Eds.) PDF

By Celso Garcia and Ramon J. Batalla (Eds.)

Maria Sala brought experimental and field-based reviews on soil and fluvial techniques in Spain in the course of the overdue Nineteen Seventies and early Nineteen Eighties. study in this huge subject has grown remarkably all over the world given that then. This name indicates a few of these advances and files the most recent learn, even if with a particularity: it supplies particular remedy to investigate on Mediterranean weather areas, an ever-present factor in Maria Sala's study profession. It includes the newest examine on slope and river approaches with a unique emphasis on rivers and catchments with a Mediterranean weather. Papers disguise a gamut of themes describing learn and utilized reports, customarily in Spain, but in addition in Israel, america, Canada, the united kingdom and New Zealand. The e-book examines average and anthropogenic procedures working in drainage basins and contains assurance of present experimental and fieldwork investigations on soil erosion, river and catchment hydrology, suspended sediment delivery and bedload dynamics in gravel-bed rivers, and present-day prognosis and destiny key-paths for catchment and river administration. * Examines the average and anthropogenic techniques working in drainage basins and river channels, and covers present investigations on technique Geomorphology and Catchment Hydrology, together with administration matters* subject matters lined comprise soil erosion, catchment hydrology, suspended sediment shipping, bedload dynamics in gravel-bed rivers, and sediment yield* Emphasis is at the Mediterranean sector

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Extra info for Catchment Dynamics and River Processes: Mediterranean and Other Climate Regions

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Gallart et al. 9. Annual precipitation depths (bars), annual sediment yields (dots), and inter-annual average of sediment yield (grey line) at the Ca l’Isard gauging station. be not representative of very steep conditions, whereas erosion pins were located with more freedom and may be more representative of the effective rates. Furthermore, other secondary sources of sediment, such as bank erosion, mass movements and gully or channel entrenchment have not been taken into account in this assessment.

Plot erosion measurements were performed during a 3-year period with a 9-slot divisor device, which collected the sediments from a natural small catchment of 1430 m2 (Castelltort and Balasch, 1993; Castelltort, 1995). 1. Location of the Vallcebre catchments. 20 F. Gallart et al. characteristic of badlands. The gauging station was provided with a V-notch control, water level and temperature sensors, an OBS-3 D&A infra-red backscattering turbidity sensor and an automatic ISCO 2700 water sampler. A DT Data Electronics data-logger was used to record the readings as well as to trigger the water sampler during events.

Finally, as the large transport events in 1997 and 1999 largely modify the inter-annual sediment yield, their recurrence intervals should be taken into account for obtaining an adequate estimate of the long-term erosion rate. 3. Conclusions The sediment dynamics in the Vallcebre catchments is dominated by the occurrence of badlands. There are strong spatial and temporal discontinuities in the conveyance of sediments from the clayey bedrock on badland surfaces to the catchment outlet: the soft bedrock is weathered mainly in winter by the role of repeated freezing –thawing cycles, the silty regolith is eroded in summer from badland surfaces to the stream channels as Catchment dynamics in a Mediterranean mountain environment 27 a consequence of intense rainstorms, and sediments are exported from the basin mainly during the main runoff events that usually occur in autumn.

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