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Dynamics of the Flow Exchanges between Matrix and Conduits in Karstified Watersheds at Multiple Temporal Scales

Géosciences Environnement Toulouse (UMR 5563 CNRS UPS IRD CNES), Université de Toulouse, 31400 Toulouse, France
UMR 1114 EMMAH, INRA-Avignon Université, 84916 Avignon, France
Normandie Université, UNIROUEN, UINCAEN, CNRS, M2C, 76000 Rouen, France
HydroSciences Montpellier (HSM), Université de Montpellier, CNRS, IRD, 34090 Montpellier, France
Author to whom correspondence should be addressed.
Water 2019, 11(3), 569;
Received: 22 February 2019 / Revised: 12 March 2019 / Accepted: 15 March 2019 / Published: 19 March 2019
(This article belongs to the Special Issue Hydraulic Behavior of Karst Aquifers)
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The focus of this paper is to investigate the ability to assess the flow exchanges between the matrix and the conduits in two karstified watersheds (Aliou and Baget, Ariège, France) using the KarstMod modeling platform. The modeling is applied using hourly and daily time series. First, the flow dynamics between the conduit and the surrounding matrix are described on a rainfall event scale (i.e., a few days). The model allows us to describe a physical reality concerning the flow reversal between matrix and conduit when there is a significant rainfall event. Then, the long-term trends (i.e., inter-annual) in the matrix water level are evidenced using the moving average over shifting horizon method (MASH). The mean water level in the matrix dropped about 10% to 15% since the late 1960s. Also, the matrix recharge has been delayed from February in the late 1960s to April since the 1990s. Moreover, the contribution of the matrix in the total spring flow is estimated though mass balance. It is estimated that the annual matrix contribution in the total spring flow is about 3% and it can increase to up to 25% during periods with low rainfall. View Full-Text
Keywords: karst aquifers; KarstMod model; hydrodynamics; lumped model karst aquifers; KarstMod model; hydrodynamics; lumped model

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Sivelle, V.; Labat, D.; Mazzilli, N.; Massei, N.; Jourde, H. Dynamics of the Flow Exchanges between Matrix and Conduits in Karstified Watersheds at Multiple Temporal Scales. Water 2019, 11, 569.

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