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Simplified conceptual diagram of the water cycle and major sources of nitrogen, phosphorus, and sediment pollution to the Chesapeake Bay. — Groundwater Diagram

Conceptual diagram illustrating Alligator Reef, which is limited in growth by the amount of exposed Pleistocene bedrock. The washing effect of water through the tidal pass has exposed peat and sandy sediments upon which coral reefs cannot become established. — Alligator Reef growth limitation

Conceptual diagram illustrating current and historical hydrological conditions of the zones in Florida Bay. — Florida Bay hydrological conditions

A strong ocean storm has sent wave and sand overwash and debris over the dunes, clearing the vegetation almost to the salt marsh on the bay side of Assateague Island. — Ocean overwash area

A natural geomorphological function of this mid-Atlantic barrier island is westward migration. On the northern end of Assateague Island, these ocean sand dunes are moving and encroaching on the edge of woodlands as part of the rollover process. — Sand dunes encroach upon forest and shrub zone

Light availability

Erosional forces from the river have exposed these roots near the confluence of the Shenandoah and Potomac Rivers at Harper's Ferry — Exposed root structure

Montana — Rock fall blocked roadway

Chain of Craters Road, Hawaii Volcanoes National Park — Road's end

Flooded salt marsh due to storm surge at high tide. Culvert allows tide to flow under road but is almost submerged due to storm. — Tropical Storm Hanna

Submerged tidal marsh due to storm surge. — Tropical Storm Hanna

Coastal erosion on Taylors Island. — Tropical Storm Hanna

Wake turbulence

Hurricane Katrina resulted in a sand bar breach into Bay Champagne — Breach to Bay Champagne

Hurricane Katrina resulted in a sand bar breach into Bay Champagne — Breach to Bay Champagne

Due to land subsidence and sea level rise, rapid wetland loss starts as wetland breakup and increase in open water — Degrading wetlands in coastal Louisiana

Aerial photo of plugged channel, which has subsequently eroded new channels to the sides — Plugged channel

Natural sediment deposition at the Wax Lake Diversion in coastal Louisiana — Wax Lake Diversion

Natural sediment deposition at the Wax Lake Diversion in coastal Louisiana — Wax Lake Diversion

May 2005, Tred Avon River, Easton, MD — Phragmite marsh and bank erosion of streamside…

Depth mean flow

Mean flow speed

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