Channel-reach morphology dependence on energy, scale, and hydroclimatic processes with implications for prediction using geospatial data

被引:38
作者
Flores, Alejandro N.
Bledsoe, Brian P.
Cuhaciyan, Christopher O.
Wohl, Ellen E.
机构
[1] MIT, Dept Civil & Environm Engn, Ralph M Parsons Lab, Cambridge, MA 02139 USA
[2] Colorado State Univ, Dept Civil Engn, Engn Res Ctr, Ft Collins, CO 80523 USA
[3] Colorado State Univ, Dept Geosci, Ft Collins, CO 80523 USA
关键词
D O I
10.1029/2005WR004226
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
[ 1] 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.
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页数:15
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