Harry Williams, Geomorphology1 SHORELINE EROSION AT MAD ISLAND MARSH PRESERVE. Mad Island Marsh Preserve is a 3,148- acre tract containing the east arm.

Slides:

Advertisements

Similar presentations

Click here for Soil Concept Map

Advertisements

Development of Wave Cut Platforms.

Civil Engineering Michael C. Applegate HQ AFSOC/CEV WETLANDS CONSTRUCTION AS MITIGATION.

Created by Miss Pflaumer For 3rd Grade Students

Welcome to Wingfield. …a new vision for Lake Murray living Wingfield.

By George and Joe. Cliffs are formed by destructive waves. When the sea hits the base of the cliff, using corrasion and hydraulic action (and if the rock.

Restoring Environment- Maintaining Infrastructure; Tradeoffs for Long Term Sustainability Bob Stokes President Galveston Bay Foundation

The Coastal Wetlands Planning, Protection and Restoration Act Presentation for the National Science Teachers Association Meeting New Orleans, LA November.

1 The Grain Drain Boston New York Washington, DC Miami Dune areas on the continental shelf caused by breaking waves are called sand bars. Waves pile up.

Landforms By: Miss Scheftic.

Chapter 15 Section 3 By- Robert Sterling, Sam Dixon, Ryan McCarthy, Mikaela Cormier, and Sarah Fournier.

Every Acre Counts The Newfound Watershed Master Plan Land Conservation Priorities In the Newfound Lake Watershed January 23, 2015 Dan Sundquist GreenFire.

Oceans Ocean Topography Physical Structure of the Ocean.

WAVES. HOW DO WAVES FORM =The energy in waves come from wind that blows across the water’s Surface.

The Adapting to Rising Tides Project San Francisco Bay Conservation and Development Commission Hayward Resilience Study.

Coastal Zones and Processes

Harry Williams, Geomorphology1 COASTS (Note: it is assumed that you know the basics of coastal geomorphology - the following is a brief review). At coastlines.

Chapter 2: Landforms of Georgia Lesson 4: How Do Humans Change Landforms? S5E1c: Students will relate the role of technology and human intervention in.

Geography Basic vocabulary. Earth Globe axis equator hemisphere pole Tropic of Cancer Tropic of Capricorn Prime meridian rotation Arctic circle Antarctic.

Destructive waves In the foreground - what are the characteristics of the waves? This type of wave has lots of energy.

Increase Atchafalaya Flow to Terrebonne Governor’s Advisory Commission Meeting 7 August 2013 committed to our coast.

GEOL 1307 Physical Geology Exercise #16 Evolution of Coastal Landforms.

Coursework Theory section Understand the Theories related to the Fieldwork at Reculver on the North Kent Coast.

Characteristics of Waves

BARRIER ISLANDS TEXAS GULF COAST.

The Holderness Coast in the north east of England stretches for 61½ km from the high chalk cliffs of Flamborough Head in the north to the sand spit of.

Welcome to the Salt Marsh One of the most productive places on Earth.

Eroded Landforms © Karen Devine 2010 Erosive Processes The sea’s erosive action can be caused by: The sea’s erosive action can be caused by: a) Hydraulic.

Unit 8 – Coasts & Sea-level Changes (Cape Cod & Acadia) Coasting Down the Coast.

BY: EZRA L. SKWARKA WATER MASSES. ONE CONTINUOUS BODY OF SALTWATER DIVIDED INTO 4 LARGE, DIFFERENTLY NAMED SECTIONS.

Prepared for: Prepared by: Identifying and Constructing a Dredged Material Placement Site while Protecting a Unique Coastal Freshwater Marsh October 2012.

Unit 1 Lesson 3 Erosion and Deposition by Water

How can we restore the shore?

Can you name the Regions of Texas? Gulf Coast Piney Woods Prairies and Lakes Panhandle Plains Big Bend Hill Country South Texas Plains.

View of well and location from the northern slope. According to a company representative, the location size has not been reduced because the well still.

Mr. Fulaytar 1.  Definition: A large group of islands.  Sentence: The Hawaiian Islands make up an archipelago. 2.

4B_Changes in Texas Ecoregions

SEA WALL Description Concrete or rock barrier built at the foot of cliffs or at the top of a beach. Has a curved face to reflect the waves back into the.

Wetlands Workshop Presented by Em LeBlanc. Let’s go on a Field Trip!

What forces shape a shoreline?

Chapter 2: Coastal Landscapes and Processes NEXT EDEXCEL GCSE GEOGRAPHY A TEACHING AND LEARNING RESOURCES Chapter 2 Coastal Landscapes and Processes Image.

Coastal landforms LS: Explain the formation of erosional coastal landforms using vast key words. Describe the process of longshore drift and describe the.

Some Types of Coastlines A closer look at: Estuaries, Deltas and Barrier Islands.

Images from Google Earth

Texas Regions Powerpoint

Effects of Weathering, Erosion and Deposition

William Burton Fred Kelley Versar, Inc Rumsey Road

By Angelos Petrou & Christos Kathidjiotis

Location index for pre-storm and post-storm LIDAR elevations for the Outer Banks, NC (Location 4 on map). Each location includes pre- and post-storm topography.

Effects of Weathering, Erosion and Deposition

Coastal Landforms.

The Coast: Beaches and Shoreline Processes

The Grain Drain ME Dune areas on the continental shelf caused by breaking waves are called sand bars. Boston Waves pile up large deposits of ocean sand.

Coastal Processes Understanding coastal processes is important when trying to preserve and protect beaches In Florida, 75% of the population (10.5 million)

Coastal Landforms.

Shoreline Features Ch

Waves Section 9.5.

Coastal Processes.

Harry Williams, Geomorphology

Presentation transcript:

Harry Williams, Geomorphology1 SHORELINE EROSION AT MAD ISLAND MARSH PRESERVE. Mad Island Marsh Preserve is a 3,148- acre tract containing the east arm of Mad Island Lake, its associated freshwater and brackish marshes, and surrounding upland prairie and shrub-land habitats. Gulf Intracoastal Water Way Dredge spoils Spartina marsh

Harry Williams, Geomorphology2

3 The Gulf Intracoastal Water Way, constructed in 1941, cuts through the southern portion of the Preserve and is flanked to the south by man-made islands of dredge spoils. GIWW - view west. Preserve Dredge spoils

Harry Williams, Geomorphology4 Considerable wave erosion has occurred, and continues to occur, along the Preserve shorelines bordering the Waterway. Shorelines along the Waterway are eroded by waves generated by barge traffic.

Harry Williams, Geomorphology Eroded road.

Harry Williams, Geomorphology6 This fence was constructed several feet back from the shore one year before this photo was taken. Undercutting has caused this block of soil to fall into the GIWW. It has also destroyed the boat ramp.

Harry Williams, Geomorphology7 The erosion is caused by waves cutting a wave-cut notch and causing collapse and cliff formation.

Harry Williams, Geomorphology8 A large Spartina marsh borders the GIWW along part of the preserve shoreline. This is a valuable wildlife habitat. It is also being eroded by wave action.

Harry Williams, Geomorphology9 There is a sharp cliff here too (hidden by high tide in this photo).

Harry Williams, Geomorphology10 The resulting cliff edge is easily identified on air photos. notch

Harry Williams, Geomorphology11 The research study was conducted in order to provide information on the location and rate of shoreline erosion along the shores of the preserve over the last fifty years. Long-term rates of shoreline erosion were established by the analysis of sequential aerial photographs taken in 1930, 1943, 1958, 1978 and The shoreline from each photograph was transferred onto a single base map. Movement of the shoreline at selected points was measured and converted to feet (or meters) of erosion per year shoreline 1978 shoreline 80 feet 80 feet in 20 years = 4 feet per year.

Harry Williams, Geomorphology

Harry Williams, Geomorphology

Harry Williams, Geomorphology

Harry Williams, Geomorphology

Harry Williams, Geomorphology

Harry Williams, Geomorphology17 Base map.

Harry Williams, Geomorphology18 Measurement locations: A…Z = shoreline migration; 1..4 width of GIWW. The main preserve shoreline = A - I.

Harry Williams, Geomorphology19 MAD ISLAND PRESERVE, SHORELINE MIGRATION: SITE 1943 ‑ ‑ ‑ ‑ 1991 FEET FT/YR FEET FT/YR FEET FT/YR FEET FT/YR A B C D E F G H I J For the main preserve shoreline, erosion rates for the most recent period ( ) vary from 0 to 6.1 feet per year. WIDTH OF WATERWAY (feet) RATIO: SITE / % % % % The width of the water way increased by an average of 282%.

Harry Williams, Geomorphology20 An important finding of the study is that severe erosion is occurring near the entrance to Mad Island Bayou. Bayou entrance

Harry Williams, Geomorphology

Harry Williams, Geomorphology Views west from the end of the peninsula.

Harry Williams, Geomorphology23 The large bend in the bayou was about 24 feet from the GIWW in Breaching of the peninsula at this point would abruptly shorten Mad Island Bayou by several hundred meters and probably increase salt water intrusion into Mad Island Lake. BayouGIWW

Harry Williams, Geomorphology24 Partly as a result of this study, the Nature Conservancy of Texas built concrete erosion barriers along this part of the preserve shoreline in so far they appear to be working - there has been no more erosion along this part of the shoreline.

Harry Williams, Geomorphology25 UPDATE: In 2005, a grad student (Webster Mangham) did a Masters thesis on erosion at MIMP between 1995 and He used GPS, DOQQs and GIS.

Harry Williams, Geomorphology26 The concrete mat still looks pretty good (in places) after 9 years.

Harry Williams, Geomorphology27 BUT – in other places it has clearly failed – the soil has been washed out from under it and it has collapsed.

Harry Williams, Geomorphology28

Harry Williams, Geomorphology29

Harry Williams, Geomorphology30

Harry Williams, Geomorphology31

Harry Williams, Geomorphology

Harry Williams, Geomorphology33