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Improving the Channel Network Management After a Large Infrequent Disturbance, Taking Advantage of Sediment Connectivity Analysis

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Part of the The Latin American Studies Book Series book series (LASBS)

Abstract

Chile is frequently affected by different natural hazards that are constantly reshaping the landscape. Particularly, Large and Infrequent Disturbances (LIDs) such as wildfires and volcanic eruptions are capable of affecting entire river catchments by altering the hydrological cycle, reducing the land cover, and boosting sediment remobilization. Given the multitude of effects caused by such disturbances, the response of the catchments is not easily predictable, and different geomorphic responses are expected. The assessment of sediment connectivity can help to better comprehend the overall effects of wildfires and volcanic eruptions on the sediment transfer dynamics at the catchment scale. Sediment connectivity infers the potential transfer of sediment between compartments of the catchment according to the spatial configurations and the processes of such compartments. After a LID, awareness of the degree of linkage between sediment sources and downstream areas is pivotal to reduce the risk and hazard, improving catchment management. In Chile, analysis of sediment connectivity is extremely valuable even tough the availability of high-resolution topographic data and catchments’ accessibility are not always guaranteed. For this reason, much effort should be employed to adapt approaches, based on high-resolution data, to this context by exploiting freely available global data and satellite images and to find trade-offs between data requirements and reliability of the outcomes.

Keywords

  • Large infrequent disturbances
  • Sediment connectivity
  • Multi-temporal mapping
  • Transferable workflow

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Acknowledgements

 This research was developed within the frame of the project FONDECYT 1200079 funded by the Chilean Government and developed within the project financed with PICC_BIRD2121_02 funds, Dept. TESAF, Università degli Studi di Padova.

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Correspondence to Lorenzo Martini .

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© 2023 The Author(s), under exclusive license to Springer Nature Switzerland AG

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Martini, L., Picco, L., Cavalli, M., Iroumé, A. (2023). Improving the Channel Network Management After a Large Infrequent Disturbance, Taking Advantage of Sediment Connectivity Analysis. In: Oyarzún, C., Mazzorana, B., Iribarren Anacona, P., Iroumé, A. (eds) Rivers of Southern Chile and Patagonia. The Latin American Studies Book Series. Springer, Cham. https://doi.org/10.1007/978-3-031-26647-8_9

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