A comprehensive field investigation of the dynamic break-up processes on the Chaudière River, Quebec, Canada

Author:

Ghobrial Tadros1ORCID,Pelchat Gabriel1,Morse Brian1

Affiliation:

1. 1 Department of Civil and Water Engineering, Laval University, 1065 av. de la Médecine, Québec, QC G1V 0A6, Canada

Abstract

Abstract The Chaudière River in Quebec, Canada, is well known for its frequent ice jam flooding events. As part of a larger watershed research program, an extensive field campaign has been carried out during the 2018–2019 and 2019–2020 winter seasons to quantify the spatiotemporal characteristics of the break-up processes along the Chaudière River. The results showed that mid-winter ice jams have formed in the Intermediate Chaudière and persisted until spring break-up. Spring break-ups were initiated in the Upper Chaudière, and then, almost simultaneously, in the Intermediate and Lower Chaudière reaches. The break-up in the Intermediate Chaudière usually lasts longer than the rest of the river since the slope is much milder, and the occurrence of mid-winter ice jams has been seen to delay the ice clearing. A reach-by-reach characterization of the cumulative degree day of thawing and discharge thresholds for the onset of break-up has been identified. During the field campaign, 51 ice jams were documented together with their location, length, date of formation, and the morphological feature triggering jam formation. Break-up patterns, hydrometeorological thresholds of ice mobilization, and ice jam sites identified in this study can serve as a basis for the implementation of an early warning system.

Funder

Ministère des Affaires municipals et de l’Habitation

Ministère de Sécurité publique

Publisher

IWA Publishing

Subject

Water Science and Technology

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