Coastal Subsidence Study 2005 - Laserfiche WebLink

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Figure 3-8 - Comparison of the inundation events, RVR2 taken on August 17, 2005 with the inundation recorded on July 10, 2006. From the plots, there are slight differences in inundation that are difficult to ascertain at the map scale. Field observations and pictures show a greater level of inundation for the July event. From the pictures in Figures 3-9 and 3-10, the extent of inundation increased for the July, 2006 event. At this point, it is believed that the major contributing factor was the stronger wind and wave setup which was observed for the more recent event, as opposed to the small amount of subsidence that may have occurred. However, given the relatively shallow depth of the channel (less than 2 inches), this particular area maybe especially sensitive to flooding caused by any drop that would make the channel deeper. This would be expressed as increased inundation. Observing inundation in this area may be an obvious indicator that subsidence may be getting worse since the current channel is relatively shallow, so any increase of only a few centimeters over many years may be readily apparent. The observation of increased inundation with increased wind and wave setup for only a minor increase in wave action indicate that given the very shallow areas along this coast, stronger wave and storm events can have a significant impact. 25