The Sand Beaches of New Hampshire and Maine
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1 The Sand Beaches of New Hampshire and Maine Beach Preservation and Erosion Control Photographs provided by Joe Kelly and Steve Adams Cover photo: Reid State Park, ME
2 Introduction The sand beaches of New Hampshire and Maine serve many purposes. They provide scenic beauty and recreational opportunities to local residents and visitors, as well as ecological habitat to numerous plant and animal species. Coastline dynamics are very complex. Wave actions and weather events can cause both erosion of sand beaches in some places and sand accumulation in others. Nonetheless, without erosion control sand beaches erode on average one to two feet per year in the Gulf of Maine. Close ties between people and the coastline often result in efforts to control this natural shoreline movement in order to maintain recreational sites, private residences and businesses. The following pages provide a basic introduction to coastal erosion issues along the sand beaches of New Hampshire and Maine, including erosion causes, control efforts and consequences. This is a multifaceted issue that affects individuals very differently depending on their relationship to the coast.
3 The Value of Coastal Beaches Human Uses Fishing Recreation Tourism-related business Ecological Functions The York County, ME, and New Hampshire coastline comprise about 70% of the coastal marsh areas of these two states. These marshes provide very unique and fragile environmental habitat. Nearshore ecosystems are highly productive due to the greater availability of nutrients there. Coastal Sand Beach Erosion Natural Causes Sea level rise Waves and tides Wind Human Causes Devices such as seawalls and jetties can increase the intensity of currents that hasten removal of beaches and expand neighboring ones. Dams on rivers can block natural sand replenishment to the beach. Activities on beaches (e.g., tracks cut into sand by motor vehicles) can accelerate sand losses. Natural shoreline habitat (Small Point, ME) Recreational beach use (Scarborough, ME) 2 3
4 Impacts of Human Activities on Coastline Ecosystems Coastline development, including roads and buildings, reduces the number of dunes, maritime forests and marsh habitat. The natural coastline is altered, and human efforts to preserve some sand beaches can cause others to erode. Conflicts between Coastal Activities and Shoreline Retreat Valuable lands and wildlife habitat can be lost. Beach erosion reduces or eliminates beach recreation activities. Beachfront properties face destruction by erosion. Beach erosion is essentially a natural phenomenon. Erosion is seen as a problem primarily along developed coastlines. Drakes Island, ME (August 1986) Seawall and shoreline stabilzation (Kennebunk, ME) Drakes Island, ME (September 1997) 4 5
5 Objectives of Erosion Control and Beach Preservation Programs Erosion Control Methods and Devices Common Methods and Devices Developed coastal area (Rye, NH) Undeveloped Areas Allow these areas to remain undeveloped and allow natural beach dynamics to occur. Seawalls (parallel to shore) Jetties and groins (perpendicular to shore) Sand replenishment Sand dunes with grasses Underwater devices (concrete reefs and wave shields) De-watering (systems that drain and pump water from the beach) Dune stabilizers (fence-like devices) When fighting nature, there may be no perfect solution. Developed Areas Assist private property owners with protecting their beachfront properties. Install both on beach and offshore erosion control devices. Replenish beach sand on a regular basis. Undertake preventative actions such as restricting new construction and reconstruction in coastal areas. Sand dunes (Hampton, NH) 6 7
6 Various Impacts of Erosion Control Positive Slow the shoreline migration process. Stabilize beach sands and delay future nourishment costs. Preserve beaches for future uses. Erosion control methods work but often require repeated effort. Negative May increase erosion on neighboring beaches. Reduce beach access to paths over dunes. May create swimming hazard and impact the water quality by restricting movement. Impact wildlife habitat such as shorebird/turtle nesting and clam resources. 8 This publication was supported by the National Sea Grant College Program of the U.S. Department of Commerce s National Oceanic and Atmospheric Administration under NOAA Grant NA16RG1035 to the New Hampshire Sea Grant Program. The views expressed herein do not necessarily reflect the views of any of those organizations. Additional copies are available from: NH Sea Grant Communications Kingman Farm University of New Hampshire Durham, NH UNHMP-P-SG-02-16
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