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Determining critical support discharge of a riverhead and river network analysis: Case studies of Lhasa River and Nyangqu River
Sha Yukun1,2; Li Weipeng1,2; Fan Jihui1; Cheng Genwei1
Corresponding AuthorCheng Genwei
AbstractA riverhead is the demarcation point of continuous water channel and seasonal channel, which is characterized by a critical flow that can support a continuous water body. In this study, the critical support discharge (CSD) is defined as the critical steady flows required to form the origin of a stream. The CSD is used as the criterion to determine the beginning of the riverhead, which can be controlled by hydro-climate factors (e.g., annual precipitation, annual evaporation, or minimum stream flow in arid season). The CSD has a close correlation with the critical support/source area (CSA) that largely affects the density of the river network and the division of sub-watersheds. In general, river density may vary with regional meteorological and hydrological conditions that have to be considered in the analysis. In this paper, a new model referring to the relationship of CSA and CSD is proposed, which is based on the physical mechanism for the origin of riverheads. The feasibility of the model was verified using two watersheds (Duilongqu Basin of the Lhasa River and Beishuiqu Basin of the Nyangqu River) in Tibet Autonomous Region to calculate the CSA and extract river networks. A series of CSAs based on different CSDs in derived equation were tested by comparing the extracted river networks with the reference network obtained from a digitized map of river network at large scales. Comparison results of river networks derived from digital elevation model with real ones indicate that the CSD (equal to criterion of flow quantity (Q (c))) are 0.0028 m(3)/s in Duilongqu and 0.0085 m(3)/s in Beishuiqu. Results show that the Q (c) can vary with hydro-climate conditions. The Q (c) is high in humid region and low in arid region, and the optimal Q (c) of 0.0085 m(3)/s in Beishuiqu Basin (humid region) is higher than 0.0028 m(3)/s in Duilongqu Basin (semi-arid region). The suggested method provides a new application approach that can be used to determine the Q (c) of a riverhead in complex geographical regions, which can also reflect the effect of hydro-climate change on rivers supply in different regions.
KeywordRiver Network Extraction Duilongqu Basin Of Lhasa River Beishuiqu Basin Of Nyangqu River Critical Support Discharge Hydro-climate Conditions Riverhead
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
WOS Subject ExtendedEnvironmental Sciences & Ecology
Indexed BySCI
WOS SubjectEnvironmental Sciences
WOS IDWOS:000380269900003
Funding OrganizationNational Natural Science Foundation of China(31070405) ; Knowledge Innovation Programs of Chinese Academy of Sciences(KZCX2-XB3-08)
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Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Chinese Acad Sci, Inst Mt Hazard & Environm, Key Lab Mt Surface Proc & Ecol Regulat, Chengdu 610041, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
Sha Yukun,Li Weipeng,Fan Jihui,et al. Determining critical support discharge of a riverhead and river network analysis: Case studies of Lhasa River and Nyangqu River[J]. CHINESE GEOGRAPHICAL SCIENCE,2016,26(4):456-465.
APA Sha Yukun,Li Weipeng,Fan Jihui,&Cheng Genwei.(2016).Determining critical support discharge of a riverhead and river network analysis: Case studies of Lhasa River and Nyangqu River.CHINESE GEOGRAPHICAL SCIENCE,26(4),456-465.
MLA Sha Yukun,et al."Determining critical support discharge of a riverhead and river network analysis: Case studies of Lhasa River and Nyangqu River".CHINESE GEOGRAPHICAL SCIENCE 26.4(2016):456-465.
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