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| Titel |
Modeling the hydrodynamic interactions between the main channel and the floodplain at McCarran Ranch in the lower Truckee River, Nevada |
| VerfasserIn |
X. Chen, L. Chen, J. Zhao, Z. Yu |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Sciences ; 15, no. 9 ; Nr. 15, no. 9 (2015-09-30), S.2161-2172 |
| Datensatznummer |
250119689
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| Publikation (Nr.) |
 copernicus.org/nhess-15-2161-2015.pdf |
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| Zusammenfassung |
| This study applied the two-dimensional AdH (adaptive hydraulics)
hydrodynamic model to a river reach to analyze flood hydraulics on complex
floodplains. Using the AdH model combined with bathymetry and topographic
data from the United States Geological Survey (USGS) seamless server and the
United States Army Corps of Engineers (USACE), we intended to examine the
interactions between the channel and floodplain of a 10 km stretch at
McCarran Ranch, which is located at the lower Truckee River in Nevada. After
calibrating the model, we tested the dependence of the modeling results on
mesh density, input parameters, and time steps and compared the modeling
results to the existing gauged data (both the discharge and water stage
heights). Results show that the accuracy of prediction from the AdH model
may decline slightly at higher discharges and water levels. The modeling
results are more sensitive to the roughness coefficient of the main channel,
which suggests that the model calibration should give priority to the main
channel roughness. A detailed analysis of the floodwater dynamics was then
conducted using the modeling approach to examine the hydraulic linkage
between the main channel and floodplains. We found that large flood events
could lead to a significantly higher proportion of total flow being routed
through the floodplains. During peak discharges, a river channel diverted as
much as 65 % of the total discharge into the floodplain. During the
periods of overbank flow, the transboundary flux ratio was approximately 5
to 45 % of the total river discharge, which indicates substantial
exchange between the main channel and floodplains. The results also showed
that both the relations of the inundation area and volume versus the
discharge exhibit an apparent looped curve form, which suggests that flood
routing has an areal hysteresis effect on floodplains. |
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