000209179 001__ 209179
000209179 005__ 20180913063153.0
000209179 037__ $$aPOST_TALK
000209179 245__ $$aNon-stationarity of solute travel time distribution observed in a controlled hydrologic transport volume
000209179 269__ $$a2013
000209179 260__ $$c2013
000209179 336__ $$aPosters
000209179 520__ $$aWe report on the outcomes of a lysimeter experiment aimed at the measurement of travel time distributions of water and certain nonreactive solutes under non-stationary conditions to examine the kinematics of age mixing. In order to simulate the release of a compound in a receiving water body, it is common in hydrology to attribute a travel time probability distribution to each particle, which reflects the response of a catchment unit to a solute input. Hence, the concentration measured at a control section becomes the convolution between the travel time distribution and the concentration of the inputs throughout the past. This study aims at experimentally demonstrating that the tracer travel time probability distribution is, in fact, strongly dependent on the antecedent conditions at the time of tracer injection and the subsequent states experienced in the system. It is therefore a function of numerous transient processes such as hydrologic filtering in soils, climatic forcing or evapotranspiration patterns. A 2-meter deep weighing lysimeter was equipped with a discharge measurement system coupled with a sample collector, an array of water content sensors and an array of porous cups for soil water sampling at three different depths. Controlled random rainfall following a Poisson process was generated, and evapotranspiration losses from two willow trees planted in the lysimeter created an important soil-water storage deficit. Five species of fluorobenzoic acids were used as tracers, and sequentially injected through rainfall at different times. The measurement system installed allowed a precise and accurate monitoring of every input and output flux and water storage, which is crucial to determine the conditions influencing the travel time distribution and to calculate the mass loads and recovery rates. Breakthrough curves for multiple tracers measured at several depths within the lysimeter and at the lysimeter outlet provide support for non-stationary tracer travel time distribution. Additional data are being collected, and will be compared with an exact solution of non-stationary distribution assuming random sampling of ages.
000209179 6531_ $$atracer
000209179 6531_ $$anon-stationary processes
000209179 6531_ $$ahydrologic transport
000209179 6531_ $$asolute transport
000209179 6531_ $$avadose zone
000209179 700__ $$0245517$$g166793$$aQueloz, Pierre
000209179 700__ $$0248157$$g238700$$aCarraro, Luca
000209179 700__ $$0240021$$g182988$$aBertuzzo, Enrico
000209179 700__ $$aBotter, Gianluca
000209179 700__ $$aRao, P. Suresh C.
000209179 700__ $$aRinaldo, Andrea$$g182281$$0240022
000209179 7112_ $$dDecember 7-13, 2013$$cSan Francisco, California, USA$$aAmerican Geophysical Union (AGU), AGU Fall meeting
000209179 909C0 $$xU10273$$0252014$$pECHO
000209179 909CO $$pposter$$pENAC$$ooai:infoscience.tind.io:209179
000209179 917Z8 $$x166793
000209179 937__ $$aEPFL-POSTER-209179
000209179 973__ $$aEPFL
000209179 980__ $$aPOSTER