Sökning: "unsaturated soil"

Visar resultat 11 - 15 av 24 avhandlingar innehållade orden unsaturated soil.

1. 11. The Lagrangian Stochastic Advective-Reactive Approach to Modeling Solute Transport in Hydrological Systems

   Författare :Archana Gupta; KTH; []
   Nyckelord :solute transport; groundwater transport; unsaturated zone; stream hydrology; stream networks; stochastic processes; mass transfer kinetics; preferential flow; temporal moments; catchment hydrology; Lagrangian transport model;

   Sammanfattning : The Lagrangian stochastic advective-reactive modelingapproach has been used for analyzing transport of bothnonreactive and reactive solutes in different hydrologicalsystems (structured soil, groundwater, mining waste rockdeposits and surface waters including single stream and networkof streams) and at different spatio-temporal scales (rangingfrom laboratory column-scale to catchment-scale). Further, afirst step has been taken to extending the Lagrangianstochastic advective-reactive modeling methodology to integratethe soil-groundwater-stream transport through a catchment. LÄS MER

3. 12. Water and Heat Transport in Road Structures : Development of Mechanistic Models

   Författare :Klas Hansson; Lars-Christer Lundin; Kurt Roth; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Hydrology; Water flow; Heat flow; Unsaturated flow; Freeze-thaw; Numerical models; Uncertainty analysis; Sensitivity analysis; Roads; Overland flow; Flow patterns; TDR; Water content reflectometer; Calibration; Fractures; Hydrologi; Hydrology; Hydrologi;

   Sammanfattning : The coupled transport of water and heat, involving freezing and thawing, in the road structure and its immediate environment is important to consider for optimal design and maintenance of roads and when assessing solute transport, of e.g. de-icing salt, from roads. LÄS MER

4. 13. The value of experimental data and modelling for exploration of hydrological functioning: The case of a till hillslope

   Författare :Nino Amvrosiadi; Jan Seibert; Kevin Bishop; Keith Beven; April James; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : Successfully modeling one system response (e.g. hydrograph or solute transport) sometimes gives the false sense of well-characterizing the modeled system. This is partly because of the well-known equifinality issue; during the calibration process multiple parameter combinations can produce similarly good results. LÄS MER

5. 14. Speciation and Transport of Radionuclides from the Chernobyl Accident within the Gideå Site

   Författare :Paul Carbol; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : The transport and redistribution of radionuclides originating from the Chernobyl accident were studied within a 1 km2 area in the northeastern part of Sweden (the Gideå site). Physical and chemical speciation of the fallout radionuclides were investigated on water samples collected within the study site using techniques developed especially for this purpose. LÄS MER

7. 15. Matrix Suction in Silt and Sand Slopes. Significance and Practical Use in Stability Analysis

   Författare :Anna-Lena Öberg; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : Conventional stability analysis in unsaturated silt and sand slopes often results in unrealistically low factors of safety. The purpose of the study was to increase the knowledge and the understanding of the unsaturated zone and its matrix suction in order to facilitate more elaborate stability analyses of silt and sand slopes. LÄS MER