Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018WR023824 |
Self-Similar Morphodynamics of Gilbert and Hyperpycnal Deltas Over Segmented Two-Slope Bedrock Channels | |
Lai, Steven Yueh Jen1; Chiu, Yi-Juei1; Wu, Fu-Chun2 | |
2019-05-01 | |
发表期刊 | WATER RESOURCES RESEARCH |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2019 |
卷号 | 55期号:5页码:3689-3707 |
文章类型 | Article |
语种 | 英语 |
国家 | Taiwan |
英文摘要 | Delta progradation over segmented two-slope bedrocks is prevalent in nature, where the bedrock slope upstream or downstream of the slope-break knickpoint is steepened by continued tectonic uplift or subsidence. Understanding the morphodynamics of the most common types of delta in different slope settings is important for interpreting the observed delta progradation into reservoir and predicting delta evolutions under future tectonic/climate scenarios or anthropogenic interventions. Here, we present an experimental and analytical study demonstrating the morphological responses of Gilbert-type and hyperpycnal deltas to variations of bedrock slopes. Steepening the upstream slope accelerates shoreline migration; steepening the downstream slope decelerates shoreline migration. In either case, the subaqueous volume is enhanced yet the subaerial volume is reduced. Both types of delta exhibit self-similar morphologies when evolving over segmented bedrocks. Hyperpycnal deltas, through enhanced sediment fluxes driven by dense underflows, develop larger subaqueous volumes. We further demonstrate the underlying self-similarities in sediment flux and bed growth rate that come into play for attaining the self-similar morphologies. The combined effect of flowrate (Q) and sediment supply rate (I) may be characterized by a dimensionless Q/I ratio. Increasing Q/I advances the entire delta. For Gilbert deltas, shoreline migration accelerates with Q/I. For hyperpycnal deltas, shoreline migration exhibits a "first-accelerate-then-decelerate" trend with Q/I in a limited range of slope combinations close to the single-slope setting, indicating that the effect of Q/I emerges only when the two-slope effect is weak or absent. Away from this near-single-slope range, the two-slope effect becomes dominant, thus suppressing the effect of Q/I. |
英文关键词 | Self-similarity Morphodynamics Gilbert delta Hyperpycnal delta Two-slope channel Bedrock channel |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000474848500006 |
WOS关键词 | UPPER INDUS RIVER ; SEDIMENT YIELD ; TARBELA DAM ; PEYTO LAKE ; BASIN ; RESERVOIR ; PAKISTAN ; SIMULATION ; MORPHOLOGY ; TRANSPORT |
WOS类目 | Environmental Sciences ; Limnology ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/183114 |
专题 | 资源环境科学 |
作者单位 | 1.Natl Cheng Kung Univ, Dept Hydraul & Ocean Engn, Tainan, Taiwan; 2.Natl Taiwan Univ, Hydrotech Res Inst, Dept Bioenvironm Syst Engn, Taipei, Taiwan |
推荐引用方式 GB/T 7714 | Lai, Steven Yueh Jen,Chiu, Yi-Juei,Wu, Fu-Chun. Self-Similar Morphodynamics of Gilbert and Hyperpycnal Deltas Over Segmented Two-Slope Bedrock Channels[J]. WATER RESOURCES RESEARCH,2019,55(5):3689-3707. |
APA | Lai, Steven Yueh Jen,Chiu, Yi-Juei,&Wu, Fu-Chun.(2019).Self-Similar Morphodynamics of Gilbert and Hyperpycnal Deltas Over Segmented Two-Slope Bedrock Channels.WATER RESOURCES RESEARCH,55(5),3689-3707. |
MLA | Lai, Steven Yueh Jen,et al."Self-Similar Morphodynamics of Gilbert and Hyperpycnal Deltas Over Segmented Two-Slope Bedrock Channels".WATER RESOURCES RESEARCH 55.5(2019):3689-3707. |
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