Coastal development hazards

A coastal development hazard is something that affects the natural environment by human activities and products. As coasts become more developed, the vulnerability component of the equation increases as there is more value at risk to the hazard. The likelihood component of the equation also increases in terms of there being more value on the coast so a higher chance of hazardous situation occurring. Fundamentally humans create hazards with their presence. In a coastal example, erosion is a process that happens naturally on the Canterbury Bight as a part of the coastal geomorphology of the area and strong long shore currents. This process becomes a hazard when humans interact with that coastal environment by developing it and creating value in that area. A natural hazard is defined as the release of energy or materials that threaten humans or what they value. In a coastal context these hazards vary temporally and spatially from a rare, sudden, massive release of energy and materials such as a major storm event or tsunami, to the continual chronic release of energy and materials such long-term coastal erosion or sea-level rise. It is this type coastal hazard, specifically around erosion and attributes surrounding erosion that this article will focus on. Globally, the number of people living on the coast is increasing. It has been stated that there has been over a 35% increase in the population of people living on the coasts since 1995. The average density of people in coastal regions is 3 times higher than the global average density. Historically, city development, especially large cities, was based on coasts due to the economic benefits of the ports. In 1950, there were only 2 megacities (cities with greater than 8 million people) in the coastal zone, London and New York City. By the mid-nineties, there were 13. Although coastal areas have globally shown population growth and increases in density, very few in-depth quantitative global studies of population have been carried out, especially in terms of distribution across specific environs, like coasts.