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| Titel |
Hydraulic analysis of river training cross-vanes as part of post-restoration monitoring |
| VerfasserIn |
T. A. Endreny, M. M. Soulman |
| 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 ; 15, no. 7 ; Nr. 15, no. 7 (2011-07-08), S.2119-2126 |
| Datensatznummer |
250012883
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| Publikation (Nr.) |
 copernicus.org/hess-15-2119-2011.pdf |
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| Zusammenfassung |
| River restoration design methods are incrementally improved by studying and
learning from monitoring data in previous projects. In this paper we report
post-restoration monitoring data and simulation analysis for a Natural
Channel Design (NCD) restoration project along 1600 m of the Batavia Kill
(14 km2 watershed) in the Catskill Mountains, NY. The restoration
project was completed in 2002 with goals to reduce bank erosion and
determine the efficacy of NCD approaches for restoring headwater streams in
the Catskill Mountains, NY. The NCD approach used a reference-reach to
determine channel form, empirical relations between the project site and
reference site bankfull dimensions to size channel geometry, and hydraulic
and sediment computations based on a bankfull (1.3 yr return interval)
discharge to test channel capacity and sediment stability. The NCD project
included 12 cross-vanes and 48 j-hook vanes as river training structures
along 19 meander bends to protect against bank erosion and maintain scour
pools for fish habitat. Monitoring data collected from 2002 to 2004 were
used to identify aggradation of pools in meander bends and below some
structures. Aggradation in pools was attributed to the meandering
riffle-pool channel trending toward step-pool morphology and cross-vane arms
not concentrating flow in the center of the channel. The aggradation
subsequently caused flow splitting and 4 partial point bar avulsions during
a spring 2005 flood with a 25-yr return interval. Processing the pre-flood
monitoring data with hydraulic analysis software provided clues the reach
was unstable and preventative maintenance was needed. River restoration and
monitoring teams should be trained in robust hydraulic analytical methods
that help them extend project restoration goals and structure stability. |
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