The Model for Dilution Process of Landslide Triggered Debris Flow —A Case of Guanba River in Tibet Southeastern Plateau

Understanding and modeling the downstream dilution process of a landslide triggered debris flow is the foundation for recognizing the boundary condition and dilution mechanism of this type of debris flow, and this serves as the theoretical basis for the categorized control of viscous debris flows, d...

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Autores:
Li, Jun
Chen, Ningsheng
Tipo de recurso:
Article of journal
Fecha de publicación:
2018
Institución:
Universidad Nacional de Colombia
Repositorio:
Universidad Nacional de Colombia
Idioma:
spa
OAI Identifier:
oai:repositorio.unal.edu.co:unal/68580
Acceso en línea:
https://repositorio.unal.edu.co/handle/unal/68580
http://bdigital.unal.edu.co/69613/
Palabra clave:
55 Ciencias de la tierra / Earth sciences and geology
Debris flows
Dilution characteristic and process
Evaluation model
Guanba River
Southeastern Tibetan Plateau
flujo de escombros
procesos y características de dilución
modelo de evaluación
río Guanba
sureste del altiplano tibetano
Rights
openAccess
License
Atribución-NoComercial 4.0 Internacional
id UNACIONAL2_7b6be0e0e955e0f5a04774573dee77d2
oai_identifier_str oai:repositorio.unal.edu.co:unal/68580
network_acronym_str UNACIONAL2
network_name_str Universidad Nacional de Colombia
repository_id_str
dc.title.spa.fl_str_mv The Model for Dilution Process of Landslide Triggered Debris Flow —A Case of Guanba River in Tibet Southeastern Plateau
title The Model for Dilution Process of Landslide Triggered Debris Flow —A Case of Guanba River in Tibet Southeastern Plateau
spellingShingle The Model for Dilution Process of Landslide Triggered Debris Flow —A Case of Guanba River in Tibet Southeastern Plateau
55 Ciencias de la tierra / Earth sciences and geology
Debris flows
Dilution characteristic and process
Evaluation model
Guanba River
Southeastern Tibetan Plateau
flujo de escombros
procesos y características de dilución
modelo de evaluación
río Guanba
sureste del altiplano tibetano
title_short The Model for Dilution Process of Landslide Triggered Debris Flow —A Case of Guanba River in Tibet Southeastern Plateau
title_full The Model for Dilution Process of Landslide Triggered Debris Flow —A Case of Guanba River in Tibet Southeastern Plateau
title_fullStr The Model for Dilution Process of Landslide Triggered Debris Flow —A Case of Guanba River in Tibet Southeastern Plateau
title_full_unstemmed The Model for Dilution Process of Landslide Triggered Debris Flow —A Case of Guanba River in Tibet Southeastern Plateau
title_sort The Model for Dilution Process of Landslide Triggered Debris Flow —A Case of Guanba River in Tibet Southeastern Plateau
dc.creator.fl_str_mv Li, Jun
Chen, Ningsheng
dc.contributor.author.spa.fl_str_mv Li, Jun
Chen, Ningsheng
dc.subject.ddc.spa.fl_str_mv 55 Ciencias de la tierra / Earth sciences and geology
topic 55 Ciencias de la tierra / Earth sciences and geology
Debris flows
Dilution characteristic and process
Evaluation model
Guanba River
Southeastern Tibetan Plateau
flujo de escombros
procesos y características de dilución
modelo de evaluación
río Guanba
sureste del altiplano tibetano
dc.subject.proposal.spa.fl_str_mv Debris flows
Dilution characteristic and process
Evaluation model
Guanba River
Southeastern Tibetan Plateau
flujo de escombros
procesos y características de dilución
modelo de evaluación
río Guanba
sureste del altiplano tibetano
description Understanding and modeling the downstream dilution process of a landslide triggered debris flow is the foundation for recognizing the boundary condition and dilution mechanism of this type of debris flow, and this serves as the theoretical basis for the categorized control of viscous debris flows, diluted debris flows, hyperconcentration flows and flash floods in a drainage basin. In this study, taking as an example a typical debris flow that occurred in the Guanba River on Tibet’s southeastern plateau on July 6th, 1998, empirical models are used to calculate the density, water flow discharge, debris flow discharge, average depth of loose materials and channel gradient at 11 cross-sections upstream to downstream in the debris flow. On this basis, the dilution characteristics and debris flow dilution process are analyzed in this study. According to the correlation between the debris flow density and the water-soil ratio and channel gradient, we have established the density evaluation model for the debris flow dilution process, which can predict the dilution process of a landslide triggered debris flow. The study results include the following four aspects: (1) The key factors in the dilution process of landslide triggered debris flows are the water flow discharge, average depth of loose materials and channel gradient. (2) The debris flow dilution characteristics in the Guanba River in 1998 include the occurrence of the debris flow dilution process after a significant increase in the water-soil ratio; an increase in the proportion of fine particles after dilution of the debris flow; and the size distribution of grain is “narrowed.” (3) In accordance with the density and dilution characteristics, the debris flow dilution process in the Guanba River can be divided into the upstream viscous debris flow section, midstream and downstream transitional debris flow section and downstream diluted debris flow section. (4) The density evaluation model for the debris flow dilution process is expressed by the Lorentz equation, and this model can reflect the debris flow dilution process such that the debris flow density will decrease gradually with an increase in the water-soil ratio and decrease in channel gradient. The density evaluation model for the debris flow dilution process has been verified by three debris flow cases, which include Gaoqiao Gully, Haizi Valley, and Aizi Valley
publishDate 2018
dc.date.issued.spa.fl_str_mv 2018-04-01
dc.date.accessioned.spa.fl_str_mv 2019-07-03T07:11:17Z
dc.date.available.spa.fl_str_mv 2019-07-03T07:11:17Z
dc.type.spa.fl_str_mv Artículo de revista
dc.type.coar.fl_str_mv http://purl.org/coar/resource_type/c_2df8fbb1
dc.type.driver.spa.fl_str_mv info:eu-repo/semantics/article
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dc.type.content.spa.fl_str_mv Text
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dc.identifier.issn.spa.fl_str_mv ISSN: 2339-3459
dc.identifier.uri.none.fl_str_mv https://repositorio.unal.edu.co/handle/unal/68580
dc.identifier.eprints.spa.fl_str_mv http://bdigital.unal.edu.co/69613/
identifier_str_mv ISSN: 2339-3459
url https://repositorio.unal.edu.co/handle/unal/68580
http://bdigital.unal.edu.co/69613/
dc.language.iso.spa.fl_str_mv spa
language spa
dc.relation.spa.fl_str_mv https://revistas.unal.edu.co/index.php/esrj/article/view/68177
dc.relation.ispartof.spa.fl_str_mv Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal
Earth Sciences Research Journal
dc.relation.references.spa.fl_str_mv Li, Jun and Chen, Ningsheng (2018) The Model for Dilution Process of Landslide Triggered Debris Flow —A Case of Guanba River in Tibet Southeastern Plateau. Earth Sciences Research Journal, 22 (2). pp. 103-111. ISSN 2339-3459
dc.rights.spa.fl_str_mv Derechos reservados - Universidad Nacional de Colombia
dc.rights.coar.fl_str_mv http://purl.org/coar/access_right/c_abf2
dc.rights.license.spa.fl_str_mv Atribución-NoComercial 4.0 Internacional
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dc.rights.accessrights.spa.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv Atribución-NoComercial 4.0 Internacional
Derechos reservados - Universidad Nacional de Colombia
http://creativecommons.org/licenses/by-nc/4.0/
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eu_rights_str_mv openAccess
dc.format.mimetype.spa.fl_str_mv application/pdf
dc.publisher.spa.fl_str_mv Universidad Nacional de Colombia - Sede Bogotá - Facultad de Ciencias - Departamento de Geociencia
institution Universidad Nacional de Colombia
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spelling Atribución-NoComercial 4.0 InternacionalDerechos reservados - Universidad Nacional de Colombiahttp://creativecommons.org/licenses/by-nc/4.0/info:eu-repo/semantics/openAccesshttp://purl.org/coar/access_right/c_abf2Li, Jun504cfa35-4781-49e3-9d74-72d2c5ce2cde300Chen, Ningshengf7a2a925-7f8f-4a64-a7ff-1094ada8b0473002019-07-03T07:11:17Z2019-07-03T07:11:17Z2018-04-01ISSN: 2339-3459https://repositorio.unal.edu.co/handle/unal/68580http://bdigital.unal.edu.co/69613/Understanding and modeling the downstream dilution process of a landslide triggered debris flow is the foundation for recognizing the boundary condition and dilution mechanism of this type of debris flow, and this serves as the theoretical basis for the categorized control of viscous debris flows, diluted debris flows, hyperconcentration flows and flash floods in a drainage basin. In this study, taking as an example a typical debris flow that occurred in the Guanba River on Tibet’s southeastern plateau on July 6th, 1998, empirical models are used to calculate the density, water flow discharge, debris flow discharge, average depth of loose materials and channel gradient at 11 cross-sections upstream to downstream in the debris flow. On this basis, the dilution characteristics and debris flow dilution process are analyzed in this study. According to the correlation between the debris flow density and the water-soil ratio and channel gradient, we have established the density evaluation model for the debris flow dilution process, which can predict the dilution process of a landslide triggered debris flow. The study results include the following four aspects: (1) The key factors in the dilution process of landslide triggered debris flows are the water flow discharge, average depth of loose materials and channel gradient. (2) The debris flow dilution characteristics in the Guanba River in 1998 include the occurrence of the debris flow dilution process after a significant increase in the water-soil ratio; an increase in the proportion of fine particles after dilution of the debris flow; and the size distribution of grain is “narrowed.” (3) In accordance with the density and dilution characteristics, the debris flow dilution process in the Guanba River can be divided into the upstream viscous debris flow section, midstream and downstream transitional debris flow section and downstream diluted debris flow section. (4) The density evaluation model for the debris flow dilution process is expressed by the Lorentz equation, and this model can reflect the debris flow dilution process such that the debris flow density will decrease gradually with an increase in the water-soil ratio and decrease in channel gradient. The density evaluation model for the debris flow dilution process has been verified by three debris flow cases, which include Gaoqiao Gully, Haizi Valley, and Aizi ValleyEl entendimiento y modelado del proceso de dilución aguas abajo del flujo de escombros causado por deslizamientos de tierra es fundamental para el reconocimiento de las condiciones límite y el mecanismo de dilución de este tipo de flujos, además de ser útil como base teórica para el control categorizado de la viscosidad de los escombros, detritos diluidos, flujos hiperconcentrados e inundaciones súbitas en una cuenca de desagüe. En este estudio, al tomar como ejemplo un flujo de detritos típico en el río Guanba, en el sureste del altiplano tibetano, del 6 de julio de 1998, se utilizaron modelos empíricos para calcular la densidad, la descarga de agua, la descarga de detritos, la profundidad promedio de materiales sueltos y la gradiente del canal en once secciones cruzadas desde aguas arriba y hacia abajo. Con base en estos datos, se analizan las características de dilución y el proceso de dilución del flujo de escombros. De acuerdo con la correlación entre la densidad del flujo de escombros y el índice agua-suelo más el gradiente del canal, se estableció el modelo de evaluación de densidad para el proceso de dilución del flujo de escombross, el cual puede predecir el proceso de dilución de un flujo causado por un deslizamiento de tierra. Los resultados del estudio incluyen los siguientes cuatro aspectos: (1) Los factores clave en la dilución de flujos de escombross causados por deslizamientos de tierra son la descarga de agua, la profundidad promedio de los materiales sueltos, y la gradiente del canal. (2) Las características de dilución del flujo de detritos en el río Guanba en 1998 incluye la ocurrencia del proceso de dilución después de un incremento significativo en el índice agua-suelo, un incremento en la proporción de partículas finas después de la dilución de los detritos, mientras la distribución por tamaños del grano es "reducida". (3) De acuerdo con las características de densidad y dilución, el proceso de dilución de detritos en el río Guanba se puede dividir entre la viscosidad de los detritos aguas arriba, el flujo transicional de detritos en el centro de la corriente y aguas abajo, y la sección de detritos diluidos aguas abajo. (4) El modelo de evaluación de densidad para el proceso de dilución del flujo de detritos se expresa con la ecuación de Lorentz, y es este modelo el que puede reflejar el proceso de dilución de forma que el flujo de escombros disminuye gradualmente con el incremento del índice agua-suelo y el decrecimiento de la gradiente de canal. El modelo de evaluación de densidad para el proceso de dilución del flujo se verificó con tres casos de flujos, que incluyen el Gaoqiao Gully, el valle Haizi y el valle Aizi.application/pdfspaUniversidad Nacional de Colombia - Sede Bogotá - Facultad de Ciencias - Departamento de Geocienciahttps://revistas.unal.edu.co/index.php/esrj/article/view/68177Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research JournalEarth Sciences Research JournalLi, Jun and Chen, Ningsheng (2018) The Model for Dilution Process of Landslide Triggered Debris Flow —A Case of Guanba River in Tibet Southeastern Plateau. Earth Sciences Research Journal, 22 (2). pp. 103-111. ISSN 2339-345955 Ciencias de la tierra / Earth sciences and geologyDebris flowsDilution characteristic and processEvaluation modelGuanba RiverSoutheastern Tibetan Plateauflujo de escombrosprocesos y características de diluciónmodelo de evaluaciónrío Guanbasureste del altiplano tibetanoThe Model for Dilution Process of Landslide Triggered Debris Flow —A Case of Guanba River in Tibet Southeastern PlateauArtículo de revistainfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501http://purl.org/coar/resource_type/c_2df8fbb1http://purl.org/coar/version/c_970fb48d4fbd8a85Texthttp://purl.org/redcol/resource_type/ARTORIGINAL68177-391094-1-PB.pdfapplication/pdf2883699https://repositorio.unal.edu.co/bitstream/unal/68580/1/68177-391094-1-PB.pdf7ba222aeede99d645c3631a577511fa7MD51THUMBNAIL68177-391094-1-PB.pdf.jpg68177-391094-1-PB.pdf.jpgGenerated Thumbnailimage/jpeg8130https://repositorio.unal.edu.co/bitstream/unal/68580/2/68177-391094-1-PB.pdf.jpgf65e046e5b034555d99b1e770e2c3679MD52unal/68580oai:repositorio.unal.edu.co:unal/685802024-05-27 23:09:39.053Repositorio Institucional Universidad Nacional de Colombiarepositorio_nal@unal.edu.co