It is anticipated that an increase in rainfall will have significant impacts on the geomorphology of permafrost landscapes. Field observations, remote sensing and historical climate data were used to investigate drivers, processes feedbacks perpetuate growth large retrogressive thaw slumps. These "mega slumps" (5–40 ha) are now common formerly glaciated, fluvially incised, ice-cored terrain Peel Plateau, NW Canada. Individual slumps can persist for decades their enlargement due ground ice...

Abstract Ice‐cored permafrost landscapes are highly sensitive to disturbance and have the potential undergo dramatic geomorphic transformations in response climate change. The acceleration of thermokarst activity lower Mackenzie Peel River watersheds northwestern Canada has led development large thaw slumps caused major impacts fluvial systems. Individual “mega slumps” thawed up 10 6 m 3 ice‐rich permafrost. widespread these (up 40 ha area with headwalls 25 height) associated debris flows...

Abstract Ice-marginal glaciated landscapes demarcate former boundaries of the continental ice sheets. Throughout circumpolar regions, permafrost has preserved relict ground and glacigenic sediments, delaying sequence postglacial landscape change that transformed temperate environments millennia earlier. Here we show within 7 × 106 km2 terrain, extensive remain poised for major climate-driven change. Across northwestern Canada, 60–100-km-wide concentric swaths thaw slump–affected terrain...

Unmanned Aerial Vehicle (UAV) systems, sensors, and photogrammetric processing techniques have enabled timely highly detailed three-dimensional surface reconstructions at a scale that bridges the gap between conventional remote-sensing field-scale observations. In this work 29 rotary fixed-wing UAV surveys were conducted during multiple field campaigns, totaling 47 flights over 14.3 km2, to document permafrost thaw subsidence impacts on or close road infrastructure in Northwest Territories,...

Globally, rivers systems are under considerable and increasing threat from multiple anthropogenic stresses, including different types of direct (e.g. channel engineering) indirect human impacts land cover use changes) that alter water sediment dynamics. (Dis)connectivity relationships determine the source, timing rates flux in catchments thus their geomorphic sensitivity to disturbance. However, most river catchment management plans overlook role (dis)connectivity. Here we examples...

Abstract. The intensification of thaw-driven mass wasting is transforming glacially conditioned permafrost terrain, coupling slopes with aquatic systems, and triggering a cascade downstream effects. Within the context recent, rapidly evolving climate controls on geomorphology we (A) quantify three-dimensional retrogressive thaw slump enlargement describe processes thresholds to (B) investigate catchment-scale patterns slope thermokarst impacts geomorphic implications, (C) map propagation...

Analyses of bed load transport data from four streams in British Columbia show that the activity mass spawning salmon moved an average almost half annual yield. Spawning‐generated changes surface topography persisted August through May due to lack floods during winter season, defining morphology for most year. Hence, salmon‐driven can substantially influence total sediment rates, and alter typical alluvial reach morphology. The finding mass‐spawning fish dominate mountain drainage basins has...

Abstract. In the warming Arctic, retrogressive thaw slumping (RTS) has emerged as primary thermokarst modifier of ice-rich permafrost slopes, raising urgency to investigate distribution and intensification disturbances cascade effects. Tracking RTS is challenging due constraints remote sensing products a narrow understanding complex, thaw-driven landforms; however, high-resolution elevation models provide new insights into geomorphic change. Structural traits, such depth or volume, can be...

Abstract The granting of rights to the Whanganui River in 2017 emerged as an outcome Tribunal hearings relating breaches Treaty Waitangi, signed between Māori chiefs and British Crown 1840. As this expression a river having legal personhood with reflects distinctively perspective upon systems, it offers prospect for new era sociocultural approaches management Aotearoa New Zealand. Using case study, paper explores prospective geomorphic meanings rights. asks, “What role can geomorphology play...

Abstract Landslides are widespread geomorphological features on the North Island of New Zealand, where they represent one primary landscape-forming processes. This study focuses steepland terrain surrounding Gisborne, a city located east coast Island, at Hikurangi subduction margin. consists young, weak, sedimentary rocks and soils; most common modes slope failures soil creep, slides flows in shallow, clay-rich regolith, triggered by heavy rainfall. Based observational data from Sentinel-1...

ABSTRACT: Magnetically tagged particles were used to investigate the effects of sockeye salmon ( Oncorhynchus nerka ) and floods on dispersion coarse bed material in Stuart‐Takla region, British Columbia, Canada. The dominant annual sediment transporting event channels is snowmelt flood events, with lesser activity usually accomplished during summer floods. Annually August, channel reworked by Early Stuart spawning, as fish excavate streambed deposit bury their eggs. These nesting cavities...

Abstract Contemporary management practices have artificially confined (strangled) river systems in Aotearoa New Zealand to support intensified land use riparian areas. These work against nature, diminishing the functionality and biodiversity values of living rivers, associated socio‐cultural relations with rivers. River confinement can accentuate flood risk by promoting development vulnerable locations limiting flexibility adapt changing climate, prospectively accentuating future disasters....

Siem Reap River has played a crucial role in maintaining the Angkor temple complex and livelihood of people basin since 12th century. Land use this watershed changed considerably over last few decades, which is thought to have had an influence on river. This study was carried out as part assessing land climate change hydrology upper River. The objective reconstruct patterns annual deforestation from 1988 2018 explore scenarios 40 80 years into future. A supervised maximum likelihood...

Abstract In the last 30 years, work on large wood (LW) has expanded and matured considerably, river scientists, managers practitioners now have a better appreciation of role LW in maintaining ecosystems, forming or stabilizing riverine landforms, interacting with morphodynamics. We gained understanding hazards posed by recruitment transport channel associated infrastructure. While dynamics traditionally been studied natural environment, innovations laboratory techniques enabled important...