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Channel‐reach morphology dependence on energy, scale, and hydroclimatic processes with implications for prediction using geospatial data
Author(s) -
Flores Alejandro N.,
Bledsoe Brian P.,
Cuhaciyan Christopher O.,
Wohl Ellen E.
Publication year - 2006
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1029/2005wr004226
Subject(s) - skewness , channel (broadcasting) , stream power , environmental science , scale (ratio) , digital elevation model , scaling , hydrology (agriculture) , elevation (ballistics) , dissipation , precipitation , physical geography , geology , meteorology , geomorphology , remote sensing , statistics , cartography , geography , computer science , mathematics , geotechnical engineering , computer network , physics , thermodynamics , geometry , erosion
Channel types found in mountain drainages occupy characteristic but intergrading ranges of bed slope that reflect a dynamic balance between erosive energy and channel boundary resistance. Using a classification and regression tree (CART) modeling approach, we demonstrate that drainage area scaling of channel slopes provides better discrimination of these forms than slope alone among supply‐ and capacity‐limited sites. Analysis of 270 stream reaches in the western United States exhibiting four common mountain channel types reveals that these types exist within relatively discrete ranges of an index of specific stream power. We also demonstrate associations among regional interannual precipitation variability, discharge distribution skewness, and means of the specific stream power index of step‐pool channels. Finally, we discuss a conceptual methodology for predicting ecologically relevant morphologic units from digital elevation models at the network scale based on the finding that channel types do not exhibit equal energy dissipation.