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Celebrating 100 Years of Science! | 1925-2025

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Conowingo Dam is the last Dam on the Susquehanna River before it empties into the Upper Chesapeake Bay. This is a series of photos taken on an overflight of the Dam and surrounding sites during mid-November, 2015.
Holtwood Dam in Autumn
Conowingo Dam is the last Dam on the Susquehanna River before it empties into the Upper Chesapeake Bay. This is a series of photos taken on an overflight of the Dam and surrounding sites during mid-November, 2015.
Peach Blossom Power Plant in Autumn
Conowingo Dam is the last Dam on the Susquehanna River before it empties into the Upper Chesapeake Bay. This is a series of photos taken on an overflight of the Dam and surrounding sites during mid-November, 2015.
Still Pond in Autumn
Conowingo Dam is the last Dam on the Susquehanna River before it empties into the Upper Chesapeake Bay. This is a series of photos taken on an overflight of the Dam and surrounding sites during mid-November, 2015.
The Susquehanna in Autumn
Conowingo Dam is the last Dam on the Susquehanna River before it empties into the Upper Chesapeake Bay. This is a series of photos taken on an overflight of the Dam and surrounding sites during mid-November, 2015.
The Susquehanna in Autumn
The Arctic coastlines are highly variable, can be stable or extremely dynamic, and are the site of most of the human activity that occurs at high latitudes. Extraction of natural resources occurs in many locations around the Arctic Ocean creating the need for port facilities and the potential for pollution. These pressures are only likely to increase with time.
Human Dimension in the Arctic coastal zone
Illustration of excess sediment running off the land into the water.
Inputs: sediments 2
In the section of the river above the dam builds up with sediment, making the dam shallower. High water flow causes scouring and the transport of sediment and associated nutrients over the dam. On this other side of the dam phosphorus mobilizes in reaction with salt water. Further down the river seagrass beds grow on the Susquehanna flats.
Conowingo Dam Reservoir and Susquehanna Flats…
Ranking tributaries by water quality, then by diffuse nitrogen sources can help to determine which watersheds are high priority. High priority watersheds are those responsible for proportionally more nutrient and sediment inputs to receiving waters than other watersheds.
Steps to Identifying High Priority Tributaries
Badlands National Park sits upon highly erodible sedimentary rocks that form distinctive pinnacles, gullies and spires. Threats to the park include illegal fossiling and the invasion of weeds and non-native grasses.
Badlands National Park
During monsoon season excess sediment is deposited in Chilika Lake, mostly from Mahanadi River tributaries, nearby settlements, and agricultural lands. As the Lake becomes more shallow and its sea outlets fill in with sediment, increased flooding occurs.
Chilika Lake Sedimentation
Coastal wetlands that are protected from erosion have an adequate sediment supply to build upwards, and will likely be more resilient to the effects of climate change.
Coastal Wetlands Resilience to Climate Change…
Simplified conceptual diagram of the water cycle and major sources of nitrogen, phosphorus, and sediment pollution to the Chesapeake Bay.
Groundwater Diagram
Construction runoff near Glen Burnie, MD that flows into Curtis Creek, which is a tributary to the Patapsco River.
Construction runoff
Construction runoff in Maryland that flows into Curtis Creek, which is a tributary to the Patapsco River.
Construction runoff
Construction runoff near Glen Burnie, MD that flows into Curtis Creek, which is a tributary to the Patapsco River.
Construction runoff during rain showers
Construction runoff near Glen Burnie, MD that flows into Curtis Creek, which is a tributary to the Patapsco River.
Construction runoff during rain showers in…
Construction runoff near Glen Burnie, MD that flows into Curtis Creek, which is a tributary to the Patapsco River.
Construction runoff during rain showers in…
Conceptual diagram illustrating tabulated Best Management Practices (BMPs).
Best Management Practices (BMPs)
Conceptual diagram illustrating impervious and pervious surfaces.
Impervious versus pervious surfaces
Conceptual diagram illustrating Regenerative stormwater conveyance systems (RSC).
Regenerative stormwater conveyance systems (RSC)
Conceptual diagram illustrating the nitrogen cycle, including the Haber-Bosch process.
The nitrogen cycle with Haber-Bosch process
Top view of a mining truck
Petroleum industry: mining truck
A section of Pipe Creek was widened to reduce sediment erosion from the streambanks. Sandusky, Ohio.
Creek Restoration
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