Author
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Hanson, Gregory |
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Submitted to: Watershed News
Publication Type: Popular Publication Publication Acceptance Date: 3/1/1996 Publication Date: N/A Citation: N/A Interpretive Summary: No new research results are reported; interpretive summary not required. Technical Abstract: The resistance of a soil to erosion is an important parameter in the management of the landscape and in design and performance of channels, embankments, and earthen spillways. Even though there is a greater understanding today of the processes involved, continued research is needed to reliably predict erosive behavior from soil properties. An alternative approach, a field and laboraory jet index method, has been developed by th Agricultural Research Service (ARS) to directly measure erosion resistance of soils. The apparatus and testing procedure were developed as a result of a joint effort by the Natural Resources Conservaton Sevice (NRCS) and the ARS to develop new design and analysis procedures for vegetated earth auxiliary spillways for flood control reservoirs. The testing apparatus consists of a vertical, submerged jet that can be used in the field or laboratory. A jet index has been developed based on the velocity of water in the jet and the amount of scour over time. The jet index test was developed for the purpose of investigating the resistance of soils in the auxiliary spillway environment, but it has wider applications. |
