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Using Kriging Method to Estimate Topographic Data of Nearshore Zone
|Authors: ||Guo-Lin Zheng|
|Contributors: ||NTOU:Department of Harbor and River Engineering|
|Issue Date: ||2011-06-30T07:37:31Z
The accurate topographic data in nearshore zone palys an important role in evaluating variation of bathymetry. In the past, the topographic surveying cannot proceed due to the safety reason of the ship maneuvering in the shallow area. It always exist a blank area with no topographic data. In this study, the Kriging method based on the concept of geostatistics which developed by G. Matheron(1962) is used to estimate the topographic data accurately in the blank area. Therefore, the bathymetry of discontinuous area can be estimated and the more accurate topographic contour in tideland can be obtained from finite measured data. To validate the accuracy of the Kriging method used in estimating topographic data. First, some measuring data of topographic survey in Yan-Liao beach were removed as a blank area. Then, using the Kriging method to estimate the topographic data in this area. Finally, relative errorr between estimated and measured data was calculated and discussed. The results support the conclusion that vertical distance and horizontal distance of the blank area can be obtained better results within 3m and 90m, respectively. The Kriging method was also applied to estimate the blank area data in bathymetry which was measured in Yan-Liao beach between 1996 and 2006. The variation of cross-shore beach profiles in different weather condition was discussed. The results indicate that the Yan-Liao beach is eroded during typhoon season, but accreted after monsoon. On these grounds, one may come to the conclusion that the Yan-Liao beach is in dynamic equilibrium.
|Appears in Collections:||[河海工程學系] 博碩士論文|
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