000185940 001__ 185940
000185940 005__ 20190316235624.0
000185940 037__ $$aPOST_TALK
000185940 245__ $$aEstimation of rainfall-driven soil erosion from different rainfall intensities, exposed areas and initial soil conditions
000185940 269__ $$a2013
000185940 260__ $$c2013
000185940 336__ $$aPosters
000185940 520__ $$aThe factors influencing the rain-splash soil erosion include rainfall characteristics, area exposed to raindrops and soil properties. Understanding of these factors and of their interactions is crucial for better predictions of soil erosion yields. To this end, laboratory flume experiments were conducted varying the precipitation rate, the fraction of exposed soil area and initial soil conditions. The discharge rate and concentrations of individual size classes were measured at the flume outlet. These data were used to investigate the dependence of soil sediment yield on the precipitation rate, area exposed and soil initial conditions. In particular, we examined the role of these factors on predicting experimental results based on a prototype experiment. Results revealed that estimates of the concentrations of individual size classes, taking the area-based approach into account, reproduce satisfactorily the measured data at steady state. It was also found that, under carefully controlled conditions, this proportionality (to area of exposed soil) holds for the entire erosive event. These findings, in terms of sediment concentrations of individual size classes, generalized previous results for the total sediment concentration. At short times, most sediment size classes have an early concentration peak, which was found not to be proportional to the area exposed and effective rainfall rate. Rather, short time behaviour is mainly controlled by the soil antecedent conditions, such as surface roughness, bulk density and soil moisture. For predictions based on precipitation rate, results showed that erosion rates based on a prototype were within a factor two of measured rates. Overall, the results indicate that, for a given soil, experimental data based on a given rainfall rate can be used as a crude estimator of the steady rate of erosion for a different rainfall rate.
000185940 700__ $$0242872$$g181271$$aJomaa, Seifeddine
000185940 700__ $$0240314$$g169209$$aBarry, David Andrew
000185940 700__ $$aSander, Graham C.
000185940 700__ $$aParlange, Jean-Yves
000185940 7112_ $$dApril 7-12, 2013$$cVienna, Austria$$aEuropean Geosciences Union General Assembly 2013
000185940 8564_ $$uhttp://www.egu2013.eu/$$zURL
000185940 8564_ $$uhttps://infoscience.epfl.ch/record/185940/files/EGU2013-14064-1.pdf$$zPublisher's version$$s38609$$yPublisher's version
000185940 909C0 $$xU11221$$0252101$$pECOL
000185940 909CO $$qGLOBAL_SET$$pposter$$ooai:infoscience.tind.io:185940$$pENAC
000185940 917Z8 $$x169209
000185940 917Z8 $$x169209
000185940 937__ $$aEPFL-POSTER-185940
000185940 973__ $$aEPFL
000185940 980__ $$aPOSTER