7 research outputs found
Prediction of bed load transport on small gravel-bed streams
Proceedings of the Seventh International Conference on Hydroscience and Engineering, Philadelphia, PA, September 2006. http://hdl.handle.net/1860/732Rates and size distributions of bed load were calculated using 3 transport relations and compared to
data collected on three streams with sand-gravel beds in the Goodwin Creek Experimental
Watershed in north central Mississippi, USA. Bed load transport rates were greatly over predicted
by two of the three relations with the third yielding values closer to the measured values.
Predictions of the median size of the bed load as compared to measured values were within about
100 percent for all three relations. The effect of bed material size distributions on the predicted rates
from the 3 relations was evaluated and it was found that bed material sizes substantially larger than
those measured in the field were needed to yield predicted rates close to those measured in the field
for two of the three relations. The third relation yielded transport rates within about 50 percent of
the measured rates using the measured bed material surface size distribution as input
Loop Rating Curves from Goodwin Creek
Two types of hysteresis loops have been observed on Goodwin Creek: those with a greater flow depth for a given discharge on the falling limb of the hydrograph (type 1) and those with a greater flow depth for a given discharge on the rising limb of the hydrograph (type 2). Causes of these 2 loop types are investigated in this paper