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Modeling catchment erosion after wildfires in the San Gabriel Mountains of southern California
Author(s) -
Rulli M. Cristina,
Rosso Renzo
Publication year - 2005
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2005gl023635
Subject(s) - erosion , debris , surface runoff , flooding (psychology) , hydrology (agriculture) , sediment , environmental science , drainage basin , debris flow , geology , physical geography , geomorphology , geography , oceanography , psychology , ecology , geotechnical engineering , cartography , psychotherapist , biology
The analysis of sediment data summarized for nine debris basins in Southern California shows that wildfires substantially increase erosion. However, the transient nature of this effect makes it difficult to assess the potential effect of wildfire from data analysis only. Therefore, a physically based simulation model having fine spatial and temporal resolution is used to predict the hydrologic and sediment fluxes from small burned and unburned catchments in the San Gabriel Mountains. These simulation runs show that fire significantly modifies the hydrologic response, especially sediment production which was increased from 7 to 35 times as a result of fire. The substantial increase in runoff and erosion following fire has also an impact on the hazards associated with the accelerated downstream flooding and debris flows.