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- W2312806985 abstract "Riparian vegetation has a number of mechanical and hydrologic effects on streambank stability. Most attempts to quantify these effects focus on the mechanical strengthening provided by the addition of roots to the soil matrix, and ignore the effect that evapotranspiration by the vegetation has on pore-water pressures within the streambank. Variations in evapotranspiration potential between riparian species have important implications for streambank stability, especially during the critical spring period when streambank failures are most likely. Results from nests of tensiometers installed at Goodwin Creek, MS, have shown that different soil matric suction values occur under different vegetative plots (mature mixed deciduous trees, 18-month-old Pine saplings, Switch Grass, and an open plot with just a turf coverage). During the critical spring period for streambank failures in 2002, average factor of safety values for the plot of mature deciduous trees were consistently 30% higher than those of the open plot, whilst average factor of safety values for the grass and Pine saplings plots varied from 0 to 10% higher than those of the open plot. Following these initial results, the evapotranspiration potentials of different riparian species were isolated by setting up a controlled experiment to grow young trees (Eastern Sycamore (Plantanus occidentalis), River Birch (Betula nigra), and Black Willow (Salix nigra)), in separate soil monoliths, each instrumented with tensiometers at 30 cm and 70 cm depths. The data from the tensiometers under the trees and grass were compared to values obtained from control monoliths containing no vegetation, in order to assess the effects of the different species on the infiltration and drying characteristics of the soil. Riparian species appear to have varying evapotranspiration potentials even under the same climatic conditions, and hence produce different factor of safety values. Results so far show that during a major storm event on March 12th 2002, the soil matric suction in the soil monoliths remained 52 to 100 % higher at 30 cm soil depth and 21 to 75% higher at 70 cm soil depth than the control monoliths. The results therefore suggest that the hydrologic reinforcement provided by riparian vegetation was important, and should be included in calculations that seek to quantify the potential reinforcing effects of vegetation." @default.
- W2312806985 created "2016-06-24" @default.
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- W2312806985 date "2003-06-17" @default.
- W2312806985 modified "2023-09-23" @default.
- W2312806985 title "The Effect of Evapotranspiration on Streambank Pore-Water Pressures" @default.
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- W2312806985 doi "https://doi.org/10.1061/40685(2003)355" @default.
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