Arid
DOI10.1007/s11769-015-0760-3
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
通讯作者Cheng Genwei
来源期刊CHINESE GEOGRAPHICAL SCIENCE
ISSN1002-0063
EISSN1993-064X
出版年2016
卷号26期号:4页码:456-465
英文摘要

A 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.


英文关键词river network extraction Duilongqu Basin of Lhasa River Beishuiqu Basin of Nyangqu River critical support discharge hydro-climate conditions riverhead
类型Article
语种英语
国家Peoples R China
收录类别SCI-E
WOS记录号WOS:000380269900003
WOS关键词DIGITAL ELEVATION MODELS ; CLIMATE-CHANGE ; TIBETAN PLATEAU ; LOW FLOWS ; WATER ; TRENDS ; IMPACT ; BASIN ; AREAS
WOS类目Environmental Sciences
WOS研究方向Environmental Sciences & Ecology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/192056
作者单位1.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
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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],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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