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Multiple knickpoints in an alluvial river generated by a single instantaneous drop in base level: experimental investigation
http://hdl.handle.net/10069/35877
http://hdl.handle.net/10069/35877c81be7e2-76e6-46a2-a542-4c89495fc957
名前 / ファイル | ライセンス | アクション |
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ESD2_271.pdf (1.1 MB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2015-10-02 | |||||
タイトル | ||||||
タイトル | Multiple knickpoints in an alluvial river generated by a single instantaneous drop in base level: experimental investigation | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | journal article | |||||
著者 |
Cantelli, Alessandro
× Cantelli, Alessandro× Muto, Tetsuji |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | Knickpoints often form in bedrock rivers in response to base-level lowering. These knickpoints can migrate upstream without dissipating. In the case of alluvial rivers, an impulsive lowering of base level due to, for example, a fault associated with an earthquake or dam removal commonly produces smooth, upstream-progressing degradation; the knickpoint associated with suddenly lowered base level quickly dissipates. Here, however, we use experiments to demonstrate that under conditions of Froude-supercritical flow over an alluvial bed, an instantaneous drop in base level can lead to the formation of upstream-migrating knickpoints that do not dissipate. The base-level fall can generate a single knickpoint, or multiple knickpoints. Multiple knickpoints take the form of cyclic steps, that is, trains of upstream-migrating bedforms, each bounded by a hydraulic jump upstream and downstream. In our experiments, trains of knickpoints were transient, eventually migrating out of the alluvial reach as the bed evolved to a new equilibrium state regulated with lowered base level. Thus the allogenic perturbation of base-level fall can trigger the autogenic generation of multiple knickpoints which are sustained until the alluvial reach recovers a graded state. | |||||
書誌情報 |
Earth Surface Dynamics 巻 2, 号 1, p. 271-278, 発行日 2014-05-05 |
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出版者 | ||||||
出版者 | Copernicus GmbH | |||||
EISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 2196632X | |||||
DOI | ||||||
関連タイプ | isIdenticalTo | |||||
識別子タイプ | DOI | |||||
関連識別子 | 10.5194/esurf-2-271-2014 | |||||
権利 | ||||||
権利情報 | c Author(s) 2014. This work is distributed under the Creative Commons Attribution 3.0 License. | |||||
著者版フラグ | ||||||
出版タイプ | VoR | |||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
引用 | ||||||
内容記述タイプ | Other | |||||
内容記述 | Earth Surface Dynamics, 2(1), pp.271-278; 2014 |