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Pré-Publication, Document De Travail Année : 2024

RFID tracking for monitoring deadwood mobility in a small coastal Mediterranean mountainous river: implementation and preliminary results

Résumé

Rivers transport a wide variety of materials, ranging from submillimeter-sized sediment particles to entire trees. The transported deadwood constitutes a vital component of wooded river ecosystems. The inputs of wood constantly alter the morphology of watercourses and influence river flow. Given the inherently complex and diverse nature of river systems, a thorough exploration of their diversity is justified to identify recurring trends in the dynamics of deadwood transport. This need becomes imperative in regions already facing prolonged episodes of drought, frequent heatwaves, and an increase in extreme precipitation events. In the specific context of the Massane River, a small Mediterranean mountain river, our study aimed to lay the groundwork for a long-term monitoring of deadwood transport by the watercourse. We began by conducting an inventory of large woody debris present in the riverbed. Subsequently, we adapted an RFID-based tracking system to monitor deadwood movement. Finally, we measured the distances traveled by wood pieces displaced following the initial rise in water levels, a consequence of RFID tagging of wood pieces. This sequential approach indicated that approximately one-third of the total deadwood stock volume was likely to be transported during an ordinary flood event. The use of RFID technology effectively enabled the downstream tracking of wood movement and revealed that even a moderate flood event could transport recently deposited wood pieces nearly 4 kilometers. This work marks the initiation of a long-term monitoring effort to trace the movement of deadwood from the river's source to its estuary and examine the relationship between flood event types and the extent of wood transport.
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Dates et versions

hal-04443320 , version 1 (07-02-2024)

Identifiants

  • HAL Id : hal-04443320 , version 1

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François Charles, Lucas Laveissière, Michel Groc, Jean-André Magdalou, Joseph Garrigue. RFID tracking for monitoring deadwood mobility in a small coastal Mediterranean mountainous river: implementation and preliminary results. 2024. ⟨hal-04443320⟩
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