This dataset provides multi-temporal Ground Penetrating Radar (GPR) reflection profiles and 3D pseudo-grids acquired across five consecutive years (2021–2025) in the unglaciated Fuglebekken catchment, adjacent marine terraces, and the glaciated Ariebekken catchment near the Polish Polar Station Hornsund (SW Spitsbergen, Svalbard).
Field surveys tracked the multi-seasonal progression of active-layer thaw depths, supra-permafrost aquifers, talik geometry, structural bedrock contacts, and near-surface salinity intrusion boundaries across contrasting seasons (spring snow cover, peak summer thaw, and late-autumn freeze-back).
Core Survey Transects & Campaign Architecture:
- Baseline Long Transects:
o Transect 1 (Lola–Brzydal–Meteo–Seashore): Traverses uplifted marine terraces from the inland Lola borehole past Brzydal and the PPS Hornsund meteorological site down to the tidal beach, capturing active layer gradients and coastal seawater/groundwater interaction boundaries.
o Transect 2 (Lisek–Renifer): Extends from the low marine terrace at borehole Lisek (near the catchment outlet) to the talus slope foot at borehole Renifer, tracking lateral active-layer deepening toward the deep unfrozen talik zone.
- Catchment-Wide & 3D Imaging:
o Transverse and longitudinal 2D profile grids covering the Fuglebekken coastal plain, swamp polygons, moraine slopes, and Ariebekken proglacial margins.
o High-density pseudo-3D grid surveys deployed in summer 2025 for volumetric mapping of active layer architecture.
All surveys were acquired with high-precision shielded antennas (primarily MALÅ ProEx 250 MHz, supplemented by 500 MHz / 800 MHz where high vertical resolution was required) coupled with differential GNSS positioning. The dataset includes raw radargram files (.rd3/.rd7, .rad), trace markers (.mrk), and synchronized GNSS spatial trajectory tables (.cor/.csv).
Funding notice: Field campaigns and geophysical processing between 2022 and 2025 were funded by the National Science Centre (NCN), Poland under grant no. UMO-2020/38/E/ST10/00139 (SONATA BIS 10; project title: Applied remote sensing and geophysical imaging in recognition of the changes of the water balance in High Arctic catchments). The 2021 survey campaigns and logistical field maintenance were supported by statutory research funding of the Institute of Geophysics, Polish Academy of Sciences (IGF PAN).