Using clast geometries to establish paleoriver discharges: Testing records for aggradation and incision from the upper Indus River, Ladakh Himalaya.
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| Title: | Using clast geometries to establish paleoriver discharges: Testing records for aggradation and incision from the upper Indus River, Ladakh Himalaya. |
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| Authors: | Kumar, Anil1 (AUTHOR) akumar@wihg.res.in, Srivastava, Pradeep1 (AUTHOR), Devrani, Rahul1 (AUTHOR) |
| Source: | Geomorphology. Aug2020, Vol. 362, pN.PAG-N.PAG. 1p. |
| Subjects: | Aggradation & degradation, Watersheds, Rivers, Glacial melting, Valleys, Geometry |
| Geographic Terms: | Himalaya Mountains |
| Abstract: | River systems in the Himalaya have been studied extensively to understand the processes driving periodic river valley aggradation and incision resulting due to rainfall, high relief, and ongoing deformation. When climatic forces are considered, the debate continues on whether wetter climatic intervals with localized glacier melting promote river aggradation through increased discharge and enhanced sediment load, or instead, it is during drier conditions that aggradation occurs through increased sediment to water ratio. This study, for the first time, attempts to constrain discharge during periods of established river aggradation and incision over late Quaternary. Here, geometric data from imbricated gravels of channel fills are used to calculate paleodischarges during net river aggradation at 47–23 ka, and preserved slack water deposits (SWDs) at 14–10 ka are used to constrain paleodischarges that occurred during net river incision. Catchment area-normalized discharge derived from these valley fill sequences ranges from 0.78 to 3.26 (×10−7 m s−1). Syn-incision discharge estimates yielded normalized discharge values of 6.17 (×10−7 m s−1) are considerably higher than discharges estimated from periods of aggradation. Morphometric analysis, chi slope, and Ksn, along the Indus River, observed no relation with the paleodischarge. This case study implies that net river incision in the upper Indus River occurs predominantly during relatively wetter climatic conditions than the climate during aggradation. • The Himalayan river aggradation is primarily driven by a reduction in the carrying capacity during the transient climatic conditions. • In wetter climatic conditions proportionally enhanced water to sediment ratio lead to incise the river. • The calculated discharge data provided a significant clue toward the role of discharge in aggradation and incision. • A new equation based on clast geometric data, for the discharge estimation, is modelled for the Indus River. [ABSTRACT FROM AUTHOR] |
| Copyright of Geomorphology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 143473481 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Using clast geometries to establish paleoriver discharges: Testing records for aggradation and incision from the upper Indus River, Ladakh Himalaya. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Kumar%2C+Anil%22">Kumar, Anil</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> akumar@wihg.res.in</i><br /><searchLink fieldCode="AR" term="%22Srivastava%2C+Pradeep%22">Srivastava, Pradeep</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Devrani%2C+Rahul%22">Devrani, Rahul</searchLink><relatesTo>1</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Geomorphology%22">Geomorphology</searchLink>. Aug2020, Vol. 362, pN.PAG-N.PAG. 1p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Aggradation+%26+degradation%22">Aggradation & degradation</searchLink><br /><searchLink fieldCode="DE" term="%22Watersheds%22">Watersheds</searchLink><br /><searchLink fieldCode="DE" term="%22Rivers%22">Rivers</searchLink><br /><searchLink fieldCode="DE" term="%22Glacial+melting%22">Glacial melting</searchLink><br /><searchLink fieldCode="DE" term="%22Valleys%22">Valleys</searchLink><br /><searchLink fieldCode="DE" term="%22Geometry%22">Geometry</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Himalaya+Mountains%22">Himalaya Mountains</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: River systems in the Himalaya have been studied extensively to understand the processes driving periodic river valley aggradation and incision resulting due to rainfall, high relief, and ongoing deformation. When climatic forces are considered, the debate continues on whether wetter climatic intervals with localized glacier melting promote river aggradation through increased discharge and enhanced sediment load, or instead, it is during drier conditions that aggradation occurs through increased sediment to water ratio. This study, for the first time, attempts to constrain discharge during periods of established river aggradation and incision over late Quaternary. Here, geometric data from imbricated gravels of channel fills are used to calculate paleodischarges during net river aggradation at 47–23 ka, and preserved slack water deposits (SWDs) at 14–10 ka are used to constrain paleodischarges that occurred during net river incision. Catchment area-normalized discharge derived from these valley fill sequences ranges from 0.78 to 3.26 (×10−7 m s−1). Syn-incision discharge estimates yielded normalized discharge values of 6.17 (×10−7 m s−1) are considerably higher than discharges estimated from periods of aggradation. Morphometric analysis, chi slope, and Ksn, along the Indus River, observed no relation with the paleodischarge. This case study implies that net river incision in the upper Indus River occurs predominantly during relatively wetter climatic conditions than the climate during aggradation. • The Himalayan river aggradation is primarily driven by a reduction in the carrying capacity during the transient climatic conditions. • In wetter climatic conditions proportionally enhanced water to sediment ratio lead to incise the river. • The calculated discharge data provided a significant clue toward the role of discharge in aggradation and incision. • A new equation based on clast geometric data, for the discharge estimation, is modelled for the Indus River. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Geomorphology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.geomorph.2020.107202 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 1 StartPage: N.PAG Subjects: – SubjectFull: Aggradation & degradation Type: general – SubjectFull: Watersheds Type: general – SubjectFull: Rivers Type: general – SubjectFull: Glacial melting Type: general – SubjectFull: Valleys Type: general – SubjectFull: Geometry Type: general – SubjectFull: Himalaya Mountains Type: general Titles: – TitleFull: Using clast geometries to establish paleoriver discharges: Testing records for aggradation and incision from the upper Indus River, Ladakh Himalaya. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Kumar, Anil – PersonEntity: Name: NameFull: Srivastava, Pradeep – PersonEntity: Name: NameFull: Devrani, Rahul IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 08 Text: Aug2020 Type: published Y: 2020 Identifiers: – Type: issn-print Value: 0169555X Numbering: – Type: volume Value: 362 Titles: – TitleFull: Geomorphology Type: main |
| ResultId | 1 |
