Coupling SKS and SWMM to Solve the Inverse Problem Based on Artificial Tracer Tests in Karstic Aquifers
Vianney Sivelle, Philippe Renard & David Labat
| Résumé |
Artificial tracer tests constitute one of the most powerful tools to
investigate solute transport in conduit-dominated karstic aquifers.
One can retrieve information about the internal structure of the
aquifer directly by a careful analysis of the residence time
distribution (RTD). Moreover, recent studies have shown the strong
dependence of solute transport in karstic aquifers on boundary
conditions. Information from artificial tracer tests leads us to
propose a hypothesis about the internal structure of the aquifers
and the effect of the boundary conditions (mainly high or low water
level). So, a multi-tracer test calibration of a model appeared to
be more consistent in identifying the effects of changes to the
boundary conditions and to take into consideration their effects on
solute transport. In this study, we proposed to run the inverse
problem based on artificial tracer tests with a numerical procedure
composed of the following three main steps: (1) conduit network
geometries were simulated using a pseudo-genetic algorithm; (2) the
hypothesis about boundary conditions was imposed in the simulated
conduit networks; and (3) flow and solute transport were simulated.
Then, using a trial-and-error procedure, the simulated RTDs were
compared to the observed RTD on a large range of simulations,
allowing identification of the conduit geometries and boundary
conditions that better honor the field data. This constitutes a new
approach to better constrain inverse problems using a multi-tracer
test calibration including transient flow. |
| Mots-clés |
karst hydrosystems; pseudo-genetic modeling; artificial tracer tests |
| Citation | Sivelle, V., Renard, P., & Labat, D. (2020). Coupling SKS and SWMM to Solve the Inverse Problem Based on Artificial Tracer Tests in Karstic Aquifers. Water, 12(4), 1139-1155. |
| Type | Article de périodique (Anglais) |
| Date de publication | 4-2020 |
| Nom du périodique | Water |
| Volume | 12 |
| Numéro | 4 |
| Pages | 1139-1155 |
| URL | https:// doi:10.3390/w12041139 |