The Sadlerochit Spring is one of a handful of small springs that provides liquid water to the North Slope of Alaska year round. Given that most other water sources in this region are frozen in the winter, springs provide critical habitat for fish and macroinvertebrates, and may play an outsized role in the regions hydrologic cycle.
Joshua C Koch, Ph.D.
Surface water / groundwater interactions; hyporheic zone hydrology and biogeochemistry; carbon, nitrogen, and phosphorus cycling; flow above / through frozen ground; preferential flow and soil pipe formation and transport.
Science and Products
Filter Total Items: 68
Emergence of the Sadlerochit Spring
The Sadlerochit Spring is one of a handful of small springs that provides liquid water to the North Slope of Alaska year round. Given that most other water sources in this region are frozen in the winter, springs provide critical habitat for fish and macroinvertebrates, and may play an outsized role in the regions hydrologic cycle.
Ice-rich permafrost bluffs on the bank of the Canning River, Alaska
Ice-rich permafrost bluffs on the bank of the Canning River, AlaskaIce-rich permafrost exerts a strong control on hydrology in Arctic regions because it limits infiltration, leading to large runoff events.
Ice-rich permafrost bluffs on the bank of the Canning River, Alaska
Ice-rich permafrost bluffs on the bank of the Canning River, AlaskaIce-rich permafrost exerts a strong control on hydrology in Arctic regions because it limits infiltration, leading to large runoff events.
Gravel bar on the north fork of the Agashashok River, Alaska
Gravel bar on the north fork of the Agashashok River, AlaskaA gravel bar on the north fork of the Agashashok River, Alaska. This work is part of the Hydro-Ecology of Arctic Thawing (HEAT): Hydrology project that takes place in the Arctic Network Parks because they lie in a region that is rapidly warming.
Gravel bar on the north fork of the Agashashok River, Alaska
Gravel bar on the north fork of the Agashashok River, AlaskaA gravel bar on the north fork of the Agashashok River, Alaska. This work is part of the Hydro-Ecology of Arctic Thawing (HEAT): Hydrology project that takes place in the Arctic Network Parks because they lie in a region that is rapidly warming.
A misty morning in the headwaters of the Akillik River, Alaska
A misty morning in the headwaters of the Akillik River, AlaskaA misty morning in the headwaters of the Akillik River, Alaska. This work is part of the Hydro-Ecology of Arctic Thawing (HEAT): Hydrology project that takes place in the Arctic Network Parks because they lie in a region that is rapidly warming.
A misty morning in the headwaters of the Akillik River, Alaska
A misty morning in the headwaters of the Akillik River, AlaskaA misty morning in the headwaters of the Akillik River, Alaska. This work is part of the Hydro-Ecology of Arctic Thawing (HEAT): Hydrology project that takes place in the Arctic Network Parks because they lie in a region that is rapidly warming.
A stream runs through ice-rich polygonal ground, Cutler River Basin
A stream runs through ice-rich polygonal ground, Cutler River BasinA small stream meanders through ice-rich polygonal ground in the Cutler River Basin, Alaska. This work is part of the Hydro-Ecology of Arctic Thawing (HEAT): Hydrology project that takes place in the Arctic Network Parks because they lie in a region that
A stream runs through ice-rich polygonal ground, Cutler River Basin
A stream runs through ice-rich polygonal ground, Cutler River BasinA small stream meanders through ice-rich polygonal ground in the Cutler River Basin, Alaska. This work is part of the Hydro-Ecology of Arctic Thawing (HEAT): Hydrology project that takes place in the Arctic Network Parks because they lie in a region that
Akilik River stream sampling
Hiking up a stream from the Akilik River drainage to set minnow traps for fish sampling. This is a stream type at the Boreal-Arctic transition of the Brooks Range, Noatak National Park and Preserve, Kobuk Valley National Park.
Hiking up a stream from the Akilik River drainage to set minnow traps for fish sampling. This is a stream type at the Boreal-Arctic transition of the Brooks Range, Noatak National Park and Preserve, Kobuk Valley National Park.
Flooding stream in a permafrost landscape, Kobuk Valley National Park
Flooding stream in a permafrost landscape, Kobuk Valley National ParkA flooding stream meanders through a permafrost landscape in Kobuk Valley National Park, Alaska. This work is part of the Hydro-Ecology of Arctic Thawing (HEAT): Hydrology project that takes place in the Arctic Network Parks because they lie in a region
Flooding stream in a permafrost landscape, Kobuk Valley National Park
Flooding stream in a permafrost landscape, Kobuk Valley National ParkA flooding stream meanders through a permafrost landscape in Kobuk Valley National Park, Alaska. This work is part of the Hydro-Ecology of Arctic Thawing (HEAT): Hydrology project that takes place in the Arctic Network Parks because they lie in a region
Agashashok River and Asik watershed
The Agashashok River and Asik watershed
The Agashashok River and Asik watershed
Example of thawing landscapes and thermokarst at our field sites
Example of thawing landscapes and thermokarst at our field sitesExample of thawing landscapes and thermokarst at our field sites
Example of thawing landscapes and thermokarst at our field sites
Example of thawing landscapes and thermokarst at our field sitesExample of thawing landscapes and thermokarst at our field sites
Soil tracer applied on burned hillslope
Brian Ebel pours a dye tracer into a pit to observe how water moves through soils on a burned hillslope.
Brian Ebel pours a dye tracer into a pit to observe how water moves through soils on a burned hillslope.
The north fork of the Agashashok River
The north fork of the Agashashok River
The north fork of the Agashashok River
The majestic Brooks Range in Gates of the Arctic National Park, Alaska
The majestic Brooks Range in Gates of the Arctic National Park, AlaskaThe majestic Brooks Range in Gates of the Arctic National Park, Alaska. This work is part of the Hydro-Ecology of Arctic Thawing (HEAT): Hydrology project that takes place in the Arctic Network Parks.
The majestic Brooks Range in Gates of the Arctic National Park, Alaska
The majestic Brooks Range in Gates of the Arctic National Park, AlaskaThe majestic Brooks Range in Gates of the Arctic National Park, Alaska. This work is part of the Hydro-Ecology of Arctic Thawing (HEAT): Hydrology project that takes place in the Arctic Network Parks.
A high alpine tributary of the Agashashok River
A high alpine tributary of the Agashashok River.
A high alpine tributary of the Agashashok River.
Collecting water chemistry samples
Ryan collects water chemistry samples during a subsurface tracer experiment while Matt observes.
Ryan collects water chemistry samples during a subsurface tracer experiment while Matt observes.
Meanders on the Agashashok River
Meanders on the Agashashok River
Meanders on the Agashashok River
A tributary at the Agashashok River Watershed
A tributary at the arctic-boreal transition in the Agashashok River Watershed
A tributary at the arctic-boreal transition in the Agashashok River Watershed
Wetlands in the Goose Creek Watershed
Wetlands in the Goose Creek watershed.
Wetlands in the Goose Creek watershed.
Goose Creek Watershed
Goose Creek Watershed
West Twin Creek catchment with Table Top Mountain
The open black spruce forest of the West Twin Creek catchment with Table Top Mountain in the background
The open black spruce forest of the West Twin Creek catchment with Table Top Mountain in the background
A convective storm on the coastal plain of Alaska
Historically, the coastal plain of Alaska has been characterized by cloudy or foggy conditions, with only limited summer rain. However, with increasing air temperatures, convective storms are becoming increasingly common.
Historically, the coastal plain of Alaska has been characterized by cloudy or foggy conditions, with only limited summer rain. However, with increasing air temperatures, convective storms are becoming increasingly common.
A degrading trough network on the Arctic Coastal Plain
A degrading trough network on the Arctic Coastal PlainA degrading trough network on the Arctic Coastal Plain.
A degrading trough network on the Arctic Coastal Plain
A degrading trough network on the Arctic Coastal PlainA degrading trough network on the Arctic Coastal Plain.
Science and Products
Filter Total Items: 68
Emergence of the Sadlerochit Spring
The Sadlerochit Spring is one of a handful of small springs that provides liquid water to the North Slope of Alaska year round. Given that most other water sources in this region are frozen in the winter, springs provide critical habitat for fish and macroinvertebrates, and may play an outsized role in the regions hydrologic cycle.
The Sadlerochit Spring is one of a handful of small springs that provides liquid water to the North Slope of Alaska year round. Given that most other water sources in this region are frozen in the winter, springs provide critical habitat for fish and macroinvertebrates, and may play an outsized role in the regions hydrologic cycle.
Ice-rich permafrost bluffs on the bank of the Canning River, Alaska
Ice-rich permafrost bluffs on the bank of the Canning River, AlaskaIce-rich permafrost exerts a strong control on hydrology in Arctic regions because it limits infiltration, leading to large runoff events.
Ice-rich permafrost bluffs on the bank of the Canning River, Alaska
Ice-rich permafrost bluffs on the bank of the Canning River, AlaskaIce-rich permafrost exerts a strong control on hydrology in Arctic regions because it limits infiltration, leading to large runoff events.
Gravel bar on the north fork of the Agashashok River, Alaska
Gravel bar on the north fork of the Agashashok River, AlaskaA gravel bar on the north fork of the Agashashok River, Alaska. This work is part of the Hydro-Ecology of Arctic Thawing (HEAT): Hydrology project that takes place in the Arctic Network Parks because they lie in a region that is rapidly warming.
Gravel bar on the north fork of the Agashashok River, Alaska
Gravel bar on the north fork of the Agashashok River, AlaskaA gravel bar on the north fork of the Agashashok River, Alaska. This work is part of the Hydro-Ecology of Arctic Thawing (HEAT): Hydrology project that takes place in the Arctic Network Parks because they lie in a region that is rapidly warming.
A misty morning in the headwaters of the Akillik River, Alaska
A misty morning in the headwaters of the Akillik River, AlaskaA misty morning in the headwaters of the Akillik River, Alaska. This work is part of the Hydro-Ecology of Arctic Thawing (HEAT): Hydrology project that takes place in the Arctic Network Parks because they lie in a region that is rapidly warming.
A misty morning in the headwaters of the Akillik River, Alaska
A misty morning in the headwaters of the Akillik River, AlaskaA misty morning in the headwaters of the Akillik River, Alaska. This work is part of the Hydro-Ecology of Arctic Thawing (HEAT): Hydrology project that takes place in the Arctic Network Parks because they lie in a region that is rapidly warming.
A stream runs through ice-rich polygonal ground, Cutler River Basin
A stream runs through ice-rich polygonal ground, Cutler River BasinA small stream meanders through ice-rich polygonal ground in the Cutler River Basin, Alaska. This work is part of the Hydro-Ecology of Arctic Thawing (HEAT): Hydrology project that takes place in the Arctic Network Parks because they lie in a region that
A stream runs through ice-rich polygonal ground, Cutler River Basin
A stream runs through ice-rich polygonal ground, Cutler River BasinA small stream meanders through ice-rich polygonal ground in the Cutler River Basin, Alaska. This work is part of the Hydro-Ecology of Arctic Thawing (HEAT): Hydrology project that takes place in the Arctic Network Parks because they lie in a region that
Akilik River stream sampling
Hiking up a stream from the Akilik River drainage to set minnow traps for fish sampling. This is a stream type at the Boreal-Arctic transition of the Brooks Range, Noatak National Park and Preserve, Kobuk Valley National Park.
Hiking up a stream from the Akilik River drainage to set minnow traps for fish sampling. This is a stream type at the Boreal-Arctic transition of the Brooks Range, Noatak National Park and Preserve, Kobuk Valley National Park.
Flooding stream in a permafrost landscape, Kobuk Valley National Park
Flooding stream in a permafrost landscape, Kobuk Valley National ParkA flooding stream meanders through a permafrost landscape in Kobuk Valley National Park, Alaska. This work is part of the Hydro-Ecology of Arctic Thawing (HEAT): Hydrology project that takes place in the Arctic Network Parks because they lie in a region
Flooding stream in a permafrost landscape, Kobuk Valley National Park
Flooding stream in a permafrost landscape, Kobuk Valley National ParkA flooding stream meanders through a permafrost landscape in Kobuk Valley National Park, Alaska. This work is part of the Hydro-Ecology of Arctic Thawing (HEAT): Hydrology project that takes place in the Arctic Network Parks because they lie in a region
Agashashok River and Asik watershed
The Agashashok River and Asik watershed
The Agashashok River and Asik watershed
Example of thawing landscapes and thermokarst at our field sites
Example of thawing landscapes and thermokarst at our field sitesExample of thawing landscapes and thermokarst at our field sites
Example of thawing landscapes and thermokarst at our field sites
Example of thawing landscapes and thermokarst at our field sitesExample of thawing landscapes and thermokarst at our field sites
Soil tracer applied on burned hillslope
Brian Ebel pours a dye tracer into a pit to observe how water moves through soils on a burned hillslope.
Brian Ebel pours a dye tracer into a pit to observe how water moves through soils on a burned hillslope.
The north fork of the Agashashok River
The north fork of the Agashashok River
The north fork of the Agashashok River
The majestic Brooks Range in Gates of the Arctic National Park, Alaska
The majestic Brooks Range in Gates of the Arctic National Park, AlaskaThe majestic Brooks Range in Gates of the Arctic National Park, Alaska. This work is part of the Hydro-Ecology of Arctic Thawing (HEAT): Hydrology project that takes place in the Arctic Network Parks.
The majestic Brooks Range in Gates of the Arctic National Park, Alaska
The majestic Brooks Range in Gates of the Arctic National Park, AlaskaThe majestic Brooks Range in Gates of the Arctic National Park, Alaska. This work is part of the Hydro-Ecology of Arctic Thawing (HEAT): Hydrology project that takes place in the Arctic Network Parks.
A high alpine tributary of the Agashashok River
A high alpine tributary of the Agashashok River.
A high alpine tributary of the Agashashok River.
Collecting water chemistry samples
Ryan collects water chemistry samples during a subsurface tracer experiment while Matt observes.
Ryan collects water chemistry samples during a subsurface tracer experiment while Matt observes.
Meanders on the Agashashok River
Meanders on the Agashashok River
Meanders on the Agashashok River
A tributary at the Agashashok River Watershed
A tributary at the arctic-boreal transition in the Agashashok River Watershed
A tributary at the arctic-boreal transition in the Agashashok River Watershed
Wetlands in the Goose Creek Watershed
Wetlands in the Goose Creek watershed.
Wetlands in the Goose Creek watershed.
Goose Creek Watershed
Goose Creek Watershed
West Twin Creek catchment with Table Top Mountain
The open black spruce forest of the West Twin Creek catchment with Table Top Mountain in the background
The open black spruce forest of the West Twin Creek catchment with Table Top Mountain in the background
A convective storm on the coastal plain of Alaska
Historically, the coastal plain of Alaska has been characterized by cloudy or foggy conditions, with only limited summer rain. However, with increasing air temperatures, convective storms are becoming increasingly common.
Historically, the coastal plain of Alaska has been characterized by cloudy or foggy conditions, with only limited summer rain. However, with increasing air temperatures, convective storms are becoming increasingly common.
A degrading trough network on the Arctic Coastal Plain
A degrading trough network on the Arctic Coastal PlainA degrading trough network on the Arctic Coastal Plain.
A degrading trough network on the Arctic Coastal Plain
A degrading trough network on the Arctic Coastal PlainA degrading trough network on the Arctic Coastal Plain.
*Disclaimer: Listing outside positions with professional scientific organizations on this Staff Profile are for informational purposes only and do not constitute an endorsement of those professional scientific organizations or their activities by the USGS, Department of the Interior, or U.S. Government