Bank conditions and erosion along selected reservoirs |
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| Authors: | Lawrence W Gatto William W Doe III |
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| Institution: | (1) Earth Sciences Branch, U.S. Army Cold Regions Research and Engineering Laboratory, 03755 Hanover, New Hampshire;(2) Department of Geography and Computer Science, U.S. Military Academy, 10996 West Point, New York |
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| Abstract: | This analysis was done as the preliminary step in an ongoing study of reservoir bank erosion processes that are active in
the northern U.S. The objectives of this analysis were to observe and document bank characteristics, conditions, and changes
along reservoirs with eroding banks, to estimate the amounts of historical bank recession and to discuss its possible causes.
Aerial photographs were used to observe the historical bank changes and estimate bank recession. Site reconnaissance, discussions
with on-site personnel, and published reports were used to evaluate possible relationships between the local erosion and bank
conditions. As part of this analysis linear regressions were done to determine if the estimated recession rates correlate
with selected bank and climatic conditions and with physical characteristics of the reservoirs. The regression results, however,
were generally not useful because they suggested relationships that are contrary to field observations and published results.
Dominant bank erosion processes were wind-wave erosion, capillary wave erosion during high-water periods, groundwater-induced
sliding, freeze-thaw processes, rain splash and rainwash, and boat waves. However, because of the complexity of the interrelationships
of these and many other bank erosion processes and the variability of the processes at and between sites, it would be necessary
to make site-specific measurements and observations year-round to evaluate the processes that are active along a particular
bank. |
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