HR: 1340h
AN: H53F-1495    [Abstracts]
TI: Application of Fluorescent Tracers on Observation of Preferential Flow
AU: * Zumr, D
EM: david.zumr@fsv.cvut.cz
AF: CTU Prague, Faculty of Civil Engineering, Thakurova 7, Prague 6, 16629, Czech Republic
AU: Cislerova, M
EM: cislerova@fsv.cvut.cz
AF: CTU Prague, Faculty of Civil Engineering, Thakurova 7, Prague 6, 16629, Czech Republic
AU: Snehota, M
EM: snehota@fsv.cvut.cz
AF: CTU Prague, Faculty of Civil Engineering, Thakurova 7, Prague 6, 16629, Czech Republic
AB: Around 60 % of the soils in the Czech Republic is composed of Cambisols formed on weathered crystalline bedrock. These soils are texturally heterogeneous and exhibit fast preferential flow. The goal of our study was to assess the preferential flow in relation with numerical modelling. The methodology was based on infiltration experiments and dye tracers. Connectivity, volumetric ratio and spatial development of preferential pathways were evaluated as the necessary information for numerical simulations with dual-permeability approach. Inflow- outflow ponded infiltration experiments with the use of fluorescent dye tracer Rhodamine 6G and Brilliant Blue tracer were performed on undisturbed core samples taken from two experimental sites in the Czech Republic. The outflow concentrations of Rhodamine 6G were continuously measured with fluorometer. Immediately after the experiments the saturated samples were horizontally sliced and each layer was photographed. The images were digitally treated to visualize and quantify geometry of the preferential flow domain. Results were used as an input into the S1D_DUAL dual-permeability numerical model to solve the infiltration-outflow experiment inversely. Breakthrough curves of Rhodamine 6G and cumulative outflows served as the calibration data for the model. The research has been carried out within the internal CTU grant 0702811 and research projects MSMT 1K05024 and VZ 04 CEZ MSM 6840770005.
DE: 1846 Model calibration (3333)
DE: 1865 Soils (0486)
DE: 1875 Vadose zone
SC: Hydrology [H]
MN: 2007 Fall Meeting