Energy Profiles Across Constructed Riffles

Autor:	R. W. Newbury, D. R. Walker, Robert G. Millar
Rok vydání:	2004
Předmět:	Hydrology geography Riffle geography.geographical_feature_category Bedform Flood myth Hydraulics Mechanical Engineering Shoal Site analysis law.invention law Range (statistics) Environmental science Hydraulic machinery Water Science and Technology Civil and Structural Engineering
Zdroj:	Journal of Hydraulic Engineering. 130:199-207
ISSN:	1943-7900 0733-9429
Popis:	Riffle reconstruction has become an important river rehabilitation technique in disturbed channels. However, design has often lacked sufficient hydraulic analysis to adequately assess the potential effects on flow resistance and flood levels. This paper describes the results of a hydraulic field study of four steep gravel-cobble bed rivers where it was found that the energy loss across natural and constructed riffle-pool sequences varied between 50 and 100% of the total energy loss over a range of high discharges up to, and including bankfull. This demonstrates that riffle reconstruction can influence postrehabilitation flood elevations, and that the additional flow resistance should be an important consideration in design. Importantly, the observed riffle energy loss is found to vary between 0.5 and 1 times the riffle amplitude, and it is proposed that this relationship can be used to account for the additional hydraulic resistance imparted by constructed riffles in the design and analysis of riffle-pool rehabilitation initiatives in steep gravel-cobble bed rivers.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::86a8577b482159a1c7443837d78eba20 https://doi.org/10.1061/(asce)0733-9429(2004)130:3(199) Zobrazit plný text záznamu Plný text ve formátu PDF