干旱区生态环境知识资源中心(Arid): A new modified spatial approach for monitoring non-perennial river water availability using remote sensing in the Tankwa Karoo, Western Cape, South Africa

Arid

DOI	10.17159/wsa/2021.v47.i3.11862
	A new modified spatial approach for monitoring non-perennial river water availability using remote sensing in the Tankwa Karoo, Western Cape, South Africa
	Seaton, Dylan; Dube, Timothy
通讯作者	Seaton, D (corresponding author), Univ Western Cape, Inst Water Studies, Dept Earth Sci, Bellville, South Africa.
来源期刊	WATER SA
ISSN	0378-4738
EISSN	1816-7950
出版年	2021
卷号	47 期号:3 页码:338-346
英文摘要	Non-perennial rivers (N-PRs) make up two thirds of all rivers in South Africa, yet many are ungauged. Traditionally, it has been assumed that when a flow is recorded, there is water throughout that river. These assumptions have led to incorrect estimations of available water resources. This work thus aimed at developing a new spatially explicit framework, for monitoring river water availability in a N-PR system. The Tankwa River in South Africa was used for testing this approach. The length of the river reach with water was determined using the Sentinel-1 and Sentinel-2 data derived indices. Image thresholding was applied to Sentinel-1, and the normalised difference water index (NDWI) to Sentinel-2. Sentinel-2 yielded an overall accuracy (OA) of 85%, whereas Sentinel-1 yielded an OA of 38%. The analysed reach of the Tankwa River had an actual length of 9 244 m. Based on the performance of Sentinel-2 data, further analysis was undertaken using Sentinel images acquired during the months of February, May and July of 2016. The results indicated that the lengths of the reaches of inundated Tankwa River were 2 809 m, 3 202 m and 2 890 m, respectively. Overall, the findings of this study show that an estimated length of a river inundated by water can be determined using new-generation Sentinel data and these results provide new insights on the dynamics of N-PRs - a previously challenging task with broadband multispectral satellite datasets.
英文关键词	non-perennial rivers remote sensing water resource management semi-arid environments Sentinel-1 and-2 data South Africa synthetic aperture radar (SAR)
类型	Article
语种	英语
开放获取类型	Green Published, gold
收录类别	SCI-E
WOS记录号	WOS:000682171600006
WOS关键词	ENVIRONMENTAL FLOW ASSESSMENTS ; SURFACE-WATER ; INDEX ; EXTRACTION ; CLASSIFICATION ; REQUIREMENTS ; MANAGEMENT ; STORAGE ; AREAS
WOS类目	Water Resources
WOS研究方向	Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/367892
作者单位	[Seaton, Dylan; Dube, Timothy] Univ Western Cape, Inst Water Studies, Dept Earth Sci, Bellville, South Africa
推荐引用方式 GB/T 7714	Seaton, Dylan,Dube, Timothy. A new modified spatial approach for monitoring non-perennial river water availability using remote sensing in the Tankwa Karoo, Western Cape, South Africa[J],2021,47(3):338-346.
APA	Seaton, Dylan,&Dube, Timothy.(2021).A new modified spatial approach for monitoring non-perennial river water availability using remote sensing in the Tankwa Karoo, Western Cape, South Africa.WATER SA,47(3),338-346.
MLA	Seaton, Dylan,et al."A new modified spatial approach for monitoring non-perennial river water availability using remote sensing in the Tankwa Karoo, Western Cape, South Africa".WATER SA 47.3(2021):338-346.