Water Pathways Through a Mediterranean Catchment -- Cross-Validation of a Distributed Hydrological Model with a Geochemical Mixing Model

Water Pathways Through a Mediterranean Catchment -- Cross-Validation of a Distributed Hydrological Model with a Geochemical Mixing Model | Authorea try { document.documentElement.classList.add('js'); } catch (e) { } var _gaq = _gaq || []; _gaq.push(['_setAccount', 'G-8VDV14Y67G']); _gaq.push(['_trackPageview']); (function() { var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); })(); Skip to main content Preprints Collections Wiley Open Research IET Open Research Ecological Society of Japan All Collections About About Authorea FAQs Contact Us Quick Search anywhere Search for preprint articles, keywords, etc. Search Search ADVANCED SEARCH SCROLL This is a preprint and has not been peer reviewed. Data may be preliminary. 18 July 2025 V1 Latest version Share on Water Pathways Through a Mediterranean Catchment -- Cross-Validation of a Distributed Hydrological Model with a Geochemical Mixing Model Authors : Nico Hachgenei 0000-0002-0490-2103 [email protected] , Flora Branger , Guillaume Nord 0000-0001-5541-9368 , Matthieu Masson , Cédric Legout 0000-0003-2958-4815 , Celine Duwig , Lorenzo Spadini , Sophie Darfeuil 0000-0003-3307-2548 , Laure Jullien , Stephane Boubkraoui , and Marina Coquery Authors Info & Affiliations https://doi.org/10.22541/au.175283486.61319715/v1 274 views 149 downloads Contents Abstract Supplementary Material Information & Authors Metrics & Citations View Options References Figures Tables Media Share Abstract Knowing not only quantities but also pathways of water through a catchment is crucial for an in-depth understanding of hydrological processes and the pathways of contaminants in the environment. We present a novel approach to validate the water transfer through a distributed hydrological model using a fully independent geochemical mixing model and apply it to the mesoscale (43km 2 ) Claduègne catchment under Mediterranean climate. We aimed to cross-validate streamflow contributions simulated by the two models over a large range of hydrological conditions, including high frequency over flood events. The catchment comprises two contrasting lithologies and mixed land uses, including extensive, diversified agriculture, towns, and forests. The model (J2000P) is distributed over hydrologic response units and includes a detailed representation of human activity. It was calibrated on discharge at three hydrometric stations throughout the catchment. A geochemical mixing model was developed in parallel, with six end-members as combinations of lithology, land cover and flow processes. Predicted stream flow contributions were compared to the hydrological model for cross-validation. Both models showed overland flow contributions that reached up to 80-90% during intense flood events. We obtained a strong agreement of the two models in both the event‐scale evolution of streamflow contributions and their overall tendencies across discharge regimes. However, at very low discharges the hydrological model consistently predicted lower basaltic and higher urban contributions. The greatest divergence between both models occurred during summer floods driven by intense rainfall on dry soils. Cross-validating streamflow contributions from two independent models ensures we obtain the right discharge results for the right reasons (flow-generating processes and spatial origins). Furthermore, it extends validation of the hydrological model beyond total discharge to include where the water comes from. Supplementary Material File (hachgenei-et-al_hydrological_geochemical_modeling_v1.docx) Download 97.74 KB Information & Authors Information Version history V1 Version 1 18 July 2025 Copyright This work is licensed under a Non Exclusive No Reuse License. Keywords end-member mixing equifinality geochemical modeling hydrological modeling mediterranean climate water pathways Authors Affiliations Nico Hachgenei 0000-0002-0490-2103 [email protected] Institut National de Recherche pour l'Agriculture l'Alimentation et l'Environnement Departement AQUA View all articles by this author Flora Branger Institut National de Recherche pour l'Agriculture l'Alimentation et l'Environnement Departement AQUA View all articles by this author Guillaume Nord 0000-0001-5541-9368 Institut des Geosciences de l'Environnement View all articles by this author Matthieu Masson Institut National de Recherche pour l'Agriculture l'Alimentation et l'Environnement Departement AQUA View all articles by this author Cédric Legout 0000-0003-2958-4815 Institut des Geosciences de l'Environnement View all articles by this author Celine Duwig Institut des Geosciences de l'Environnement View all articles by this author Lorenzo Spadini Institut des Geosciences de l'Environnement View all articles by this author Sophie Darfeuil 0000-0003-3307-2548 Institut des Geosciences de l'Environnement View all articles by this author Laure Jullien Institut des Geosciences de l'Environnement View all articles by this author Stephane Boubkraoui Institut des Geosciences de l'Environnement View all articles by this author Marina Coquery Institut National de Recherche pour l'Agriculture l'Alimentation et l'Environnement Departement AQUA View all articles by this author Metrics & Citations Metrics Article Usage 274 views 149 downloads .FvxKWukQNSOunydq8rnd { width: 100px; } Citations Download citation Nico Hachgenei, Flora Branger, Guillaume Nord, et al. Water Pathways Through a Mediterranean Catchment -- Cross-Validation of a Distributed Hydrological Model with a Geochemical Mixing Model. Authorea . 18 July 2025. DOI: https://doi.org/10.22541/au.175283486.61319715/v1 If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download. For more information or tips please see 'Downloading to a citation manager' in the Help menu . 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