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YUNJAE CHOUNG_DISSERTATION_FINAL.pdf (20.06 MB)

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Mapping levees for river basin management using LiDAR data and multispectral aerial orthoimages

Choung, Yun Jae
http://rave.ohiolink.edu/etdc/view?acc_num=osu1393260770

Abstract Details

2014, Doctor of Philosophy, Ohio State University, Geodetic Science and Surveying.
Mapping levees is important to assessing levee stability, identifying flood risks for the areas protected by levee systems, etc. Historically, mapping levees has been carried out using ground surveying methods or only one type of remote sensing data set. This dissertation aims at mapping the levees by using airborne topographic LiDAR data and multispectral orthoimages taken in the river basins of the Nakdong River. In this dissertation, three issues with mapping levees are illustrated. The first issue is developing new methods for mapping levee surfaces by using geometric and spectral information. Levee surfaces consist of multiple objects having different geometric and spectral patterns. This dissertation proposes multiple methods for identifying the major objects and eroded areas on the levee surfaces. Multiple geometric analysis approaches such as the slope difference analysis and the elevation and area analysis are used to identify the levee top, berm, slope plates and the eroded area having different geometric patterns. Next, the spectral analysis approach, such as clustering algorithms, is used to identify major objects having different spectral patterns on the plates identified. Finally, multiple components, including the major objects and eroded areas on the levee surfaces, are identified. The second issue is developing new methods for mapping levee lines by using the geometric and spectral information. In general, the levee lines are determined on levee surfaces by considering the geometric pattern, the types of major objects, etc. This dissertation proposes multiple methods for mapping the levee lines located on various levee surfaces. First, the three baselines (the edges extracted from the images, the cluster boundaries extracted from the identified clusters and the plate boundaries extracted from the LiDAR data) are extracted separately from different sources. Next, the judgment test is performed in order to select one baseline as the levee line segment most suitable for the levee surface. Finally, levee lines consisting of multiple baselines are generated in all levee surfaces having different geometric and spectral patterns. The third issue is establishing a levee information system to assess failure risks for the levee systems in the Nakdong River basins. This dissertation proposes new methods for establishing these levee information systems by using the generated levee lines and identified objects on the levee surfaces. First, various levee failure risks are evaluated separately on each levee segment. Next, the level of failure risks on each levee segment is measured by using the risks for each. Finally, the levee segments having failure risks are identified along the levee lines using specific colors (red, blue, yellow and green). Using the above procedure, levee information systems are established to assess the failure risks of the levee systems in the Nakdong River basins. The established levee information systems show that the areas of Changnyeong City protected by the levees having the safe conditions from levee failure are the safest zones from flooding.
Rongxing Li (Advisor)
Alper Yilmaz (Committee Member)
Ralph von Frese (Committee Member)
189 p.
Civil Engineering; Geographic Information Science; Geography; Land Use Planning
Levee, LiDAR, Multispectral orthoimages, Flood risks, Flood hazard map

Recommended Citations

Citations

  • Choung, Y. J. (2014). Mapping levees for river basin management using LiDAR data and multispectral aerial orthoimages [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1393260770

    APA Style (7th edition)

  • Choung, Yun Jae. Mapping levees for river basin management using LiDAR data and multispectral aerial orthoimages. 2014. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1393260770.

    MLA Style (8th edition)

  • Choung, Yun Jae. "Mapping levees for river basin management using LiDAR data and multispectral aerial orthoimages." Doctoral dissertation, Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1393260770

    Chicago Manual of Style (17th edition)

osu1393260770
360
© 2014, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.