Coastal Components GLY 2030 C 1 Coastal Processes

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Coastal Components GLY 2030 C 1

Coastal Components GLY 2030 C 1

Coastal Processes • Beach form and process • Sand on beaches is not static

Coastal Processes • Beach form and process • Sand on beaches is not static • Cross-shore Sediment Transport • Longshore Sediment Transport • Erosion factors • Most sand supplied by rivers – Damming effects • Tropical Cyclones • Erosion control structures • Some land use planning can minimize human effects • Eustatic sea level changes-worldwide, non-tectonic; results from glacial melting and oceanic warming

Longshore Sediment Transport • Beaches are referred to as “rivers of sand” because their

Longshore Sediment Transport • Beaches are referred to as “rivers of sand” because their sediment is constantly in motion. GLY 2030 C 3

Littoral Cells and Sediment Budgets • Entire sediment cycle ( delivery, transport, and loss)

Littoral Cells and Sediment Budgets • Entire sediment cycle ( delivery, transport, and loss)

Wave Climate • Statistical description of wave height, period, and direction

Wave Climate • Statistical description of wave height, period, and direction

Wave Climate • Statistical description of wave height, period, and direction

Wave Climate • Statistical description of wave height, period, and direction

Wave Climate • Numerical Modeling of Wave Energy Flux and LST

Wave Climate • Numerical Modeling of Wave Energy Flux and LST

Coastal Engineering • Coastal erosion -often piece-meal approach • Engineering Structures -improve navigation and

Coastal Engineering • Coastal erosion -often piece-meal approach • Engineering Structures -improve navigation and control erosion • Groins-perpendicular to shore; results in “scalloped” beaches • Breakwaters -intercept waves • Jetties- at mouths of rivers and inlets GLY 2030 C 8

Effects of “hard” solutions GLY 2030 C 9

Effects of “hard” solutions GLY 2030 C 9

Effects of “hard” solutions GLY 2030 C 10

Effects of “hard” solutions GLY 2030 C 10

“Soft” Solutions Beach nourishment GLY 2030 C 11

“Soft” Solutions Beach nourishment GLY 2030 C 11

Coastal Hazards • Perception of and adjustment to coastal hazards • • Bearing the

Coastal Hazards • Perception of and adjustment to coastal hazards • • Bearing the loss (most common response) Modify potential losses (better code enforcement) “Armored Beaches” vs. “Living with It” Philosophy • Coastal erosion is a natural process; problems derive from human structures • Any shoreline construction causes changes • Stabilization protects the few at the expense of the many • Engineering structures destroy the beaches they are designed to protect • Shoreline structures start a trend that is difficult, if impossible to reverse GLY 2030 C 12