A cold-region watershed located in the discontinuous permafrost zone near Umiujaq (Nunavik, Canada) was studied in order to increase understanding of the subarctic water cycle and permafrost dynamics. This essay gives an overview of the research, summarised in a collection of six papers that: respectively characterize the physical three-dimensional cryo-hydrogeological system, present a detailed water balance of the watershed, characterize groundwater and surface-water hydrogeochemistry, describe the application of a tracer method to determine groundwater fluxes, develop a two-dimensional numerical model identifying impacts of groundwater flow on permafrost dynamics, and present a parameter sensitivity analysis. The work serves as a guide for developing site characterization plans at similar permafrost-impacted sites and for evaluating their groundwater resource potential.

研究了位于Umiujaq（加拿大努纳维克）附近的不连续多年冻土带中的一个寒冷地区分水岭，以增进对北极水循环和多年冻土动力学的了解。本文对研究进行了概述，并在六篇论文中进行了总结：分别描述了三维三维物理物理-低温水文地质系统，详细描述了流域的水平衡，描述了地下水和地表水水文地球化学，描述了应用示踪法确定地下水通量的方法，建立二维数值模型以识别地下水流量对多年冻土动力学的影响并进行参数敏感性分析。