DOI: 10.5194/hess-24-3229-2020
论文题名: Assessment of the geomorphic effectiveness of controlled floods in a braided river using a reduced-complexity numerical model
作者: Ziliani L. ; Surian N. ; Botter G. ; Mao L.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2020
卷: 24, 期: 6 起始页码: 3229
结束页码: 3250
语种: 英语
Scopus关键词: Floods
; Morphology
; Numerical models
; Stochastic models
; Stochastic systems
; Channel morphology
; Controlled floods
; Effective solution
; Flow regime management
; Morphodynamic modeling
; Morphological changes
; Physically-based hydrologic models
; Reduced complexity
; Rivers
; assessment method
; braided river
; complexity
; flood control
; geomorphology
; numerical model
英文摘要: Most Alpine rivers have undergone significant alterations in flow and sediment regimes. These alterations have notable effects on river morphology and ecology. One option to mitigate such effects is flow regime management, specifically through the reintroduction of channel-forming discharges. The aim of this work is to assess the morphological changes induced in the Piave River (Italy) by two distinct controlled-flood strategies, the first characterized by a single artificial flood per year and the second by higher-magnitude but less frequent floods. This work involved applying a two-dimensional reduced-complexity morphodynamic model (CAESAR-LISFLOOD) to a 7 km long reach, characterized by a braided pattern and highly regulated discharges. Numerical modelling allowed the assessment of morphological changes for four long-term scenarios (2009-2034). The scenarios were defined considering the current flow regime and the natural regime, which was estimated by a stochastic physically based hydrologic model. Changes in channel morphology were assessed by measuring active-channel width and braiding intensity. A comparison of controlled-flood scenarios to a baseline scenario (i.e. no controlled floods) showed that artificial floods had little effect on channel morphology. More channel widening (13.5 %) resulted from the high-magnitude flood strategy than from the application of the other strategy (8.6 %). Negligible change was observed in terms of braiding intensity. The results indicate that controlled floods do not represent an effective solution for morphological recovery in braided rivers with strongly impacted flow and sediment regimes. © 2020 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162658
Appears in Collections: 气候变化与战略
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作者单位: Ziliani, L., Department of Geosciences, University of Padua, Padua, Italy; Surian, N., Department of Geosciences, University of Padua, Padua, Italy; Botter, G., Department of Civil Environmental and Architectural Engineering, University of Padua, Padua, Italy; Mao, L., School of Geography, University of Lincoln, Lincoln, United Kingdom
Recommended Citation:
Ziliani L.,Surian N.,Botter G.,et al. Assessment of the geomorphic effectiveness of controlled floods in a braided river using a reduced-complexity numerical model[J]. Hydrology and Earth System Sciences,2020-01-01,24(6)