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Intérêt de la mesure de la qualité des cours d’eau à très haute résolution pour une meilleure gestion des bassins versants

Abstract : Although the preservation and restoration of headwater streams has been described for many years as essential to reclaiming water quality, there are only few operational tools to understand these complex hydrosystems. Official water quality measurement stations usually drain watersheds with a surface area of more than 10 km2. This paper presents the interest of measuring water quality at high spatial resolution for better watershed management, through the application of an innovative service on a territory concerned by green algae tides in summer. This service involves the use of a portable measurement system, developed specifically for longitudinal monitoring of water quality in small watercourses at the head of a watershed, and validated by comparison with laboratory analyzes. About 50 measurement points were carried out in April, June and September 2018 along a linear 8 km line on one of the headwaters of the Frémur, a major contributor to the Baie de la Fresnaye (22) regarding discharge and flux of nitrates. The results demonstrate the interest of high-resolution spatial measurements to better understand the hydrosystem, to easily identify point or diffuse sources along the stream, and to calculate the relative contribution of each source to discharge and pollutant flow to the stream. The method also allows qualitative comparisons before/after stream restoration.
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https://hal.ehesp.fr/hal-03701963
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Submitted on : Wednesday, June 22, 2022 - 3:59:22 PM
Last modification on : Thursday, June 23, 2022 - 3:44:15 AM

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Jean Causse, Olivier Thomas. Intérêt de la mesure de la qualité des cours d’eau à très haute résolution pour une meilleure gestion des bassins versants. Techniques Sciences Méthodes , ASTEE/EDP Sciences, 2020, pp.13-18. ⟨10.36904/tsm/202004013⟩. ⟨hal-03701963⟩

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