The long-term impact of channel stabilization using gabion structures on Zealand River, New Hampshire
Autor: | Leah S. Puklin, Douglas M. Thompson, Anna E. Marshall |
---|---|
Rok vydání: | 2016 |
Předmět: |
Vertical channel
geography Engineering Environmental Engineering geography.geographical_feature_category 010504 meteorology & atmospheric sciences business.industry 0208 environmental biotechnology Structural integrity 02 engineering and technology Management Monitoring Policy and Law 01 natural sciences 020801 environmental engineering Abrasion (geology) Revetment Sill Geotechnical engineering Gabion business Channel (geography) 0105 earth and related environmental sciences Nature and Landscape Conservation Bed load |
Zdroj: | Ecological Engineering. 95:779-792 |
ISSN: | 0925-8574 |
Popis: | Zealand River, NH contains the second oldest major stream-stabilization project in the U.S. that extensively used gabions, which are stone-filled, wire-mesh baskets used to construct revetment walls, grade-control sills, or groin deflectors. In 2014, a study was conducted on a 4.5-km stretch of river to determine the status of gabion structures installed from 1960 to 1963, and the impact of those gabions on geomorphic channel stability. Longitudinal profiles, cross-sectional surveys and field observations provide evidence of channel incision, narrowing and avulsions at collapsed walls. Gabion sills failed first, which allowed 1–2 m of localized incision that undercut gabion walls, which then toppled into the eroded channel. Corrosion and abrasion by bedload movement, floating large wood and winter ice enhanced failure of gabion structures by breaking wire at the base of walls. Gabions with broken wires often spilled their rock fill and lost their structural integrity. Although gabions were intended to stabilize the river, they enhanced vertical channel incision, failed to prevent bank instability, and created localized channel widening and avulsions associated with depositional reaches. |
Databáze: | OpenAIRE |
Externí odkaz: |