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I enjoyed the visit at the Department of Civil and Environmental Engineering at Princeton University. I have had great discussions with Professor Lin and her Hurricane Hazards and Risk Analysis Research Group.  Princeton Campus  Princeton Campus  Princeton Campus  I am sitting on a chair on Princeton Campus  I am standing in front of the student center
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I am honored to be invited to give a seminar talk, entitled "Understanding Human Judgement on Environmental Risks and Hazards in a Geographic Context," at the Department of Civil and Environmental Engineering at Princeton University on June 21.
The abstract of the talk is as follows: "The coupling effects of changing climate and rising concentration of population and assets in the coastal regions have increased the threat of potential damages. There is an urgent need for coastal communities to prepare well for future hazards through mitigation and adaptation measures. A growing number of empirical studies have found that peoples’ motivation of voluntary risk mitigation and adaptation is low unless actual risk can be perceived. Risk perception is thus the precondition for adaptive behavior. It is of both intellectual and practical interests to study what affects individuals’/communities’ risk perceptions. In this talk, I will present four of my previous studies. The first three studies are focused on the individual level and the fourth on the aggregate level. I will start with understanding how local weather and climate affect American public risk perceptions of climate change. I will then discuss how the spatial context represented by past flooding events and estimated flooding risks influence costal residents’ voluntary flood insurance purchase decisions and their support for flood adaptation policies. As many policies are designed and implemented at an aggregate level (i.e., state, county, city), it is necessary to examine aggregate-level risk perceptions. In the fourth study, I will focus on how the contextual hurricane risks in conjunction with community resilience shape county-level perceptions of hurricane-related risks. I will end with a research agenda linking communities’ perception with contextual risks and community resilience. I contend that the cognitive dimension including both risk perceptions and perceived adaptive capacity is not represented in any of the existing community resilience indexes, and therefore needs to be measured, quantified, and incorporated into a more comprehensive index." Hurricane Harvey dumped record-breaking rain in Houston in 2017. Now, a new study shows that this extreme amounts of rainfalls actually resulted from unprecedented ocean heat content. This study presents some evidence to support the link between global temperature rise with increasing hurricane intensity.
I presented my research on understanding human judgments on environmental risks and hazards in a geographic context at the American Association of Geographers annual conference in New Orleans, LA. I also presented our study on environmental hazards and mental health among Gulf Coastal counties in this meeting.  The figure in the slide is from the Pew Research Center for the People and the Press Our new paper on aggregate perceptions of hurricane risks has been published on the Annals of American Association of Geographers.
I presented our study on community resilience and county-level perceptions of hurricane risks along the US Gulf Coast at the 2017 Society for Risk Analysis annual conference in Arlington, VA.   In a study that has been accepted by the Annals of the American Association of Geographers, my coauthors and I have examined how community resilience along with objective hurricane risks impacts aggregate perceptions of hurricane risks. We first applied spatial techniques to transform individual-level perceptions to the aggregate level, in this case, counties. The map below displays the geographic pattern of hurricane risk perceptions among coastal counties along the U.S. Gulf Coast. Clearly, there is a concentration of heightened hurricane risk perceptions stretching from southeast Texas to west Florida. Given the recent enormous impact of Hurricane Harvey in southeast Texas and West Louisiana, it is likely that risk perception has further increased among coastal residents who have been affected by Harvey. Further, we found two aspects of community resilience measured by Cutter et al. (2014), namely economic resilience and community capital, are positively related to aggregate perceptions of hurricanes risks. This indicates that communities with more economic resources and social capital tend to perceive greater threat of hurricanes. The policy implication is that counties with less economic and social capitals need to direct efforts on educating the public about scientific assessments of hurricanes risks.  County Level Risk Perception Scores (Source: Shao, Gardezi, and Xian, forthcoming) Reference:
Cutter, S. L., Ash, K. D. and Emrich, C. T. 2014. The geographies of community disaster resilience. Global Environmental Change, 29, 65-77. Shao, W, Gardezi, M., and Xian, S. (forthcoming). Examining the effects of objective hurricane risks and community resilience on risk perceptions of hurricanes at the county level in the U.S. Gulf Coast: An innovative approach" Annals of the American Association of Geographers. Natural disaster is never purely natural. The moment when a natural event such as a hurricane, tornado, or wildfire "meets" with a societal community on its path, the event has the potential to become a disaster from the perspective of human society. Hurricanes essentially serve as nature's venue to reallocate energy geographically from the tropical region to higher latitudes. But because some communities are built on the usual path of hurricanes, they are vulnerable to this type of natural events. Hurricane Maria has left the U.S. territory Puerto Rico in despair. Because of its geographic location, Hurricane Maria certainly will not be the last one to affect this region. To build better resilience, the first thing every community needs to do is raise its awareness of such interactions between nature and society.
River sediments are essential to building marshes and wetlands. When a river meets with a large body of water such as an ocean, the velocity of water decreases, so does its carrying capacity. This causes sediments to deposit at the intersection of river and ocean, forming lands. What happens when rivers are deprived of sediments? Dams around the world have kept sediments from flowing downstream to build marshes and wetlands. Now, with the rising sea level, the realization that marshes and wetlands act as natural barriers leads to calling for dam removal.
We know that coastal Louisiana has been sinking, due to a combination of land subsidence and sea level rise. A new study shows that the current sinking rate is what many considered "worst case scenario."
Land subsidence has been going on for thousands of years. Many scientists believe the construction of dams and oil and gap extraction activities worsens this situation by intervening the natural Mississippi delta building process. Sea level rise due to temperature increase further complicates this matter. Despite the intensive efforts to protect and restore coastal Louisiana, many residents in rapidly sinking areas have no choice but relocate. |
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