Seasonal precipitation gradients and their impact on fluvial sediment flux in the Northwest Himalaya
Seasonal precipitation gradients and their impact on fluvial sediment flux in the Northwest Himalaya
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喜马拉雅西北地区季节性降水梯度及其对河流泥沙通量的影响
DOI:
10.1016/j.geomorph.2009.12.003
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发表时间:
2010
期刊:
影响因子:
3.9
通讯作者:
Scherler
中科院分区:
文献类型:
--
作者:
Bookhagen;Scherler
Precipitation in the form of rain and snowfall throughout the Himalaya controls river discharge and erosional processes and, thus, has a first-order control on the fluvial sediment flux. Here, we analyze daily precipitation data (1998–2007) of 80 weather stations from the northwestern Himalaya in order to decipher temporal and spatial moisture gradients. In addition, suspended sediment data allow assessment of the impact of precipitation on the fluvial sediment flux for a 103-km2catchment (Baspa). We find that weather stations located at the mountain front receive ∼80% of annual precipitation during summer (May–Oct), whereas stations in the orogenic interior, i.e., leeward of the orographic barrier, receive ∼60% of annual precipitation during winter (Nov–Apr). In both regions 4–6 rainstorm days account for ∼40% of the summer budgets, while rainstorm magnitude–frequency relations, derived from 40-year precipitation time-series, indicate a higher storm variability in the interior than in the frontal region. This high variability in maximum annual rainstorm days in the orogenic interior is reflected by a high variability in extreme suspended sediment events in the Baspa Valley, which strongly affect annual erosion yields. The two most prominent 5-day-long erosional events account for 50% of the total 5-year suspended sediment flux and coincide with synoptic-scale monsoonal rainstorms. This emphasizes the erosional impact of the Indian Summer Monsoon as the main driving force for erosion processes in the orogenic interior, despite more precipitation falling during the winter season.
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DOI:
--
发表时间:
2008
期刊:
影响因子:
--
作者:
T. Einfalt;S. Michaelides
通讯作者:
S. Michaelides
DOI:
--
发表时间:
1995
期刊:
影响因子:
--
作者:
S. Weiers
通讯作者:
S. Weiers
影响因子:
64.8
作者:
P. Reiners;T. Ehlers;S. Mitchell;D. Montgomery
通讯作者:
P. Reiners;T. Ehlers;S. Mitchell;D. Montgomery
DOI:
--
发表时间:
2006
期刊:
影响因子:
--
作者:
B. Bookhagen;D. Burbank
通讯作者:
D. Burbank
影响因子:
3.2
作者:
Winiger, M;Gumpert, M;Yamout, H
通讯作者:
Yamout, H