HR: 0800h
AN: OS21B-1240    [Abstracts]
TI: Three Dimensional Intertidal Bottom Topography Observation Using the Camera Monitoring System
AU: * KIM, T
EM: trkim@kunsan.ac.kr
AF: Kunsan University, Miryong-Dong San 68, Kunsan, 573-701 Korea, Republic of
AB: The man-initiated coastal development is increasing recently and provokes rapid changes of environments in coastal area by losing its equilibrium maintained for a long period in nature. These undesirable impacts to the coastal environments also occur in a wide area of mud flat in the intertidal zone caused by large scaled reclamation projects or construction of embankment around ports. Intertidal zone is the region that is above the low-water mark and below the high-water mark, and only exposed during lowest tides. The mild slope of these regions makes it difficult to measure the bottom topography and sometimes the soft mud flat is dangerous place to survey. Because of these reasons, the traditional in-situ measurements on the intertidal topography was done only at the small number of fixed points and had difficulties to figure out quantitatively the characteristics of wide region in the intertidal zone. Especially, considering a very little morphological changes of mud flat, new observation technique for the wide area of mud flat in the intertidal zone is needed. Also, in terms of numerical model, there is not enough data for the comparison between the model results and the field data on the bottom changes in the intertidal zone. The advancement of digital imaging technique with remote controlling system makes it possible to use a camera for monitoring many kinds of natural phenomena. It has an ability to look spatial features and is more intuitive. In recent years, the camera observation including satellite remote sensing is begun to be used for monitoring longterm shoreline changes in several countries. However, in a case of west coast of Korea, the wide range of intertidal zone and the continuously changing flood lines are regarded as shortcomings for image observation of shoreline changes. Theses shortcomings can be converted to very valuable conditions for measuring the topography in the intertidal zone. The rising of boundary lines between water and land during the flood indicates depth contours from the lowest waters to the highest waters. By extracting the contours, we can construct three dimensional bottom topography in the intertidal zone and monitor morphological changes. In this research, new technique for the observation of bottom topography in the intertidal zone is introduced with some examples.
DE: 3384 Waves and tides
DE: 4546 Nearshore processes
DE: 1724 Ocean sciences
DE: 1294 Instruments and techniques
DE: 1635 Oceans (4203)
SC: Ocean Sciences [OS]
MN: 2004 AGU Fall Meeting