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| Titel |
Integration of 2-D hydraulic model and high-resolution lidar-derived DEM for floodplain flow modeling |
| VerfasserIn |
D. Shen, J. Wang, X. Cheng, Y. Rui, S. Ye |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 19, no. 8 ; Nr. 19, no. 8 (2015-08-18), S.3605-3616 |
| Datensatznummer |
250120792
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| Publikation (Nr.) |
 copernicus.org/hess-19-3605-2015.pdf |
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| Zusammenfassung |
| The rapid progress of lidar
technology has made the acquirement and application of high-resolution digital elevation model (DEM) data increasingly popular, especially in regards to
the study of floodplain flow. However, high-resolution DEM data pose several
disadvantages for floodplain modeling studies; e.g., the data sets contain
many redundant interpolation points, large numbers of calculations are
required to work with data, and the data do not match the size of the
computational mesh. Two-dimensional (2-D) hydraulic modeling, which is a
popular method for analyzing floodplain flow, offers highly precise
elevation parameterization for computational mesh while ignoring much of the
micro-topographic information of the DEM data itself. We offer a flood
simulation method that integrates 2-D hydraulic model results and
high-resolution DEM data, thus enabling the calculation of flood water
levels in DEM grid cells through local inverse distance-weighted
interpolation. To get rid of the false inundation areas during
interpolation, it employs the run-length encoding method to mark the
inundated DEM grid cells and determine the real inundation areas through the
run-length boundary tracing technique, which solves the complicated problem
of connectivity between DEM grid cells. We constructed a 2-D hydraulic model
for the Gongshuangcha detention basin, which is a flood storage area of
Dongting Lake in China, by using our integrated method to simulate the
floodplain flow. The results demonstrate that this method can solve DEM
associated problems efficiently and simulate flooding processes with greater
accuracy than simulations only with DEM. |
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