干旱区生态环境知识资源中心(Arid): Determining Critical Support Discharge of a Riverhead and River Network Analysis: Case Studies of Lhasa River and Nyangqu River

Arid

	Determining Critical Support Discharge of a Riverhead and River Network Analysis: Case Studies of Lhasa River and Nyangqu River
	Sha Yukun; Li Weipeng; Fan Jihui; Cheng Genwei
来源期刊	Chinese Geographical Science
ISSN	1002-0063
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
开放获取类型	Bronze
收录类别	CSCD
WOS研究方向	Geology
CSCD记录号	CSCD:5728991
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/335665
作者单位	Sha Yukun, Institute of Mountain Hazard and Environment, Chinese Academy of Sciences, Key Laboratory of Mountain Surface Process and Ecological Regulation, Chinese Academy of Sciences, Chengdu, Sichuan 610041, China.; Li Weipeng, Institute of Mountain Hazard and Environment, Chinese Academy of Sciences, Key Laboratory of Mountain Surface Process and Ecological Regulation, Chinese Academy of Sciences, Chengdu, Sichuan 610041, China.; Fan Jihui, Institute of Mountain Hazard and Environment, Chinese Academy of Sciences, Key Laboratory of Mountain Surface Process and Ecological Regulation, Chinese Academy of Sciences, Chengdu, Sichuan 610041, China.; Cheng Genwei, Institute of Mountain Hazard and Environment, Chinese Academy of Sciences, Key Laboratory of Mountain Surface Process and Ecological Regulation, Chinese Academy of Sciences, Chengdu, Sichuan 610041, China.
推荐引用方式 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],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.