CHANNEL CHANGES AND SEDIMENT TRANSPORT IN CANYON LAKE GORGE, TX AFTER 2002 FLOOD

A large volume of runoff causes flood that exceed the capacity of flood control reservoir in Canyon Lake, TX. This volume of runoff was also caused by the low- pressure system in the Gulf of Mexico that contributes to a large amount of precipitation. Canyon Lake Gorge was formed as a result of a major erosional event in 2002 that was combination of large volume runoff, precipitation, and low-pressure system from the Gulf. For this research channel changes in the Canyon and sediment transport are evaluated using acoustic Doppler current profiler (ADCP), resistivity analysis, ground penetrating radar (GPR), and photogrammetry. On the sediment transport aspect, a series of aerial photograph from 1950 to post flood will be compared to see how much the sediment has changed and how much is transported to the Guadalupe River. During field work, a core sample will be taken to classify grain size. The justification for this is that the Canyon Lake Gorge have a unique formation, geologic time scale before and after the flood has changed, channel changes in the bedload is affected, and the sedimentary structure will be different as well.