These sessions will introduce the basic natural processes,

historical geographic ranges, and potential

impacts of the natural hazards that

are unique to the coastal zone.

Session 6 : MajorCoastal Hazards Part I

(Courtesy: http://www.nasa.gov/)

Session 6: Coastal Hazards ICoastal Hazards Management CourseSlide 6. 1, Lecture Outline

Introduction: What is a Coastal Hazard?

Session 6 : Coastal Hazards ICoastal Hazards Management CourseSlide 6. 2, Introduction

Coastal Hazards can be defined as natural hazards that occur within the coastal zone.

The following major coastal hazards will be discussed in this session:

• Hurricanes• Coastal Erosion• Tsunami• Flooding

(Courtesy: www.electrofin.com)

(Courtesy: www.hyperreal.org/~mike/livejo

urnal/)

(Courtesy: http://www.library.yale.edu/MapColl/hyannis.htm)

(Courtesy: www.missouri.edu/~geosc

mbu/ ocean2003.html )

What is a Hurricane?

Session 6: Coastal Hazards ICoastal Hazards Management CourseSlide 6. 3, Hurricanes

(Courtesy: http://www.mthurricane.com/hurricanes.htm)

(Courtesy:http://www.weatherstock.com/hurricanecat-science2.html)

(Courtesy: http://hpccsun.unl.edu/nebraska/Gtrack.html)

(Courtesy: NOAA Photo Library)

Hurricanes can take

very variabletracks

What is Coastal Erosion?

Session 6: Coastal Hazards ICoastal Hazards Management CourseSlide 6. 4, Coastal Erosion

(Black-and-white photographs courtesy of Pacific Studios, Newport, Oregon.Color photographs taken by Parke D. Snavely, Jr. of the USGS.)

1890

1920

1970

1990

What is a Tsunami?

Session 6 : Coastal Hazards ICoastal Hazards Management CourseSlide 6. 5, Tsunamis

(Courtesy: FEMA)

Tsunamis can be triggered by earthquakes, volcanoes or landslides

(Courtesy: users.belgacom.net)

(Courtesy: National Weather Service)

Monitoring takes place on buoys

What is a Flood?

Session 6: Coastal Hazards ICoastal Hazards Management CourseSlide 6. 6, Floods

(Courtesy: http://www.sci.muni.cz/botany/gallery/lf109.jpg)

There are two types of floods• Flash Floods

Riverine floods are common in low lying, sandy coastal areas, whereas flash floods are more common along rocky coasts

• Riverine Floods

(Courtesy: www.utahweather.org)

Distribution of Hurricanes

Session 6: Coastal Hazards ICoastal Hazards Management CourseSlide 6. 7, Hurricane distribution

(Courtesy: NOAA)

(Courtesy: ww2010.atmos.uiuc.edu )

Hurricanes can take many different tracks, but are limited to the Western Hemisphere. Cyclones and typhoons are found elsewhere in the world.

Distribution of Coastal Erosion

Session 6: Coastal Hazards ICoastal Hazards Management CourseSlide 6. 8, Coastal Erosion distribution

(Courtesy: US Army Corps of Engineers)

Coastal Erosion is very localized. Some sections of sandy beaches will erode, while close by another section will accrete sand.

(Courtesy: The Heinz Center Evaluation of Erosion Hazards)

Distribution of Tsunamis

Session 6 : Coastal Hazards ICoastal Hazards Management CourseSlide 6. 9, Tsunami distribution

(Courtesy: http://www.geophys.washington.edu/tsunami/general/historic/historic.html)

A map of large tsunamis of recent history that were generated by earthquakes

Distribution of Floods

Session 6: Coastal Hazards ICoastal Hazards Management CourseSlide 6. 10, Flood distribution

(Courtesy: www.nhoem.state.nh.us )