干旱区生态环境知识资源中心(Arid): Monitoring early-season agricultural drought using temporal Sentinel-1 SAR-based combined drought index

Arid

DOI	10.1007/s10661-023-11524-y
	Monitoring early-season agricultural drought using temporal Sentinel-1 SAR-based combined drought index
	Dilip, T.; Kumari, Mamta; Murthy, C. S.; Neelima, T. L.; Chakraborty, Abhishek; Devi, M. Uma
通讯作者	Kumari, M
来源期刊	ENVIRONMENTAL MONITORING AND ASSESSMENT
ISSN	0167-6369
EISSN	1573-2959
出版年	2023
卷号	195 期号:8
英文摘要	Early-season agricultural drought is frequent over South Asian region due to delayed or deficient monsoon rainfall. These drought events often cause delay in sowing and can even result in crop failure. The present study focuses on monitoring early-season agricultural drought in a semi-arid region of India over 5-year period (2016-2020). It utilizes hydro-climatic and biophysical variables to develop a combined drought index (CDI), which integrates anomalies in soil moisture conditions, rainfall, and crop-sown area progression. Synthetic aperture radar (SAR)-based soil moisture index (SMI) represents in situ measured soil moisture with reasonable accuracy (r=0.68). Based on the highest F1-score, SAR backscatter in VH (vertical transmit-horizontal receive) polarization with specific values for parameter threshold (-18.63 dB) and slope threshold (-0.072) is selected to determine the start of season (SoS) with a validation accuracy of 73.53%. The CDI approach is used to monitor early-season agricultural drought and identified drought conditions during June-July in 2019 and during July in 2018. Conversely, 2020 experienced consistently wet conditions, while 2016 and 2017 had near-normal conditions. Overall, the study highlights the use of SAR data for early-season agricultural drought monitoring, which is mainly governed by soil moisture-driven crop-sowing progression. The proposed methodology holds potential for effective monitoring, management, and decision-making in early-season agricultural drought scenarios.
英文关键词	SAR Sentinel-1 SPI Early-season drought Combined drought index
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001025074400003
WOS关键词	SOIL-MOISTURE ; NDVI ; PHENOLOGY
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/2XILL650/396181
推荐引用方式 GB/T 7714	Dilip, T.,Kumari, Mamta,Murthy, C. S.,et al. Monitoring early-season agricultural drought using temporal Sentinel-1 SAR-based combined drought index[J],2023,195(8).
APA	Dilip, T.,Kumari, Mamta,Murthy, C. S.,Neelima, T. L.,Chakraborty, Abhishek,&Devi, M. Uma.(2023).Monitoring early-season agricultural drought using temporal Sentinel-1 SAR-based combined drought index.ENVIRONMENTAL MONITORING AND ASSESSMENT,195(8).
MLA	Dilip, T.,et al."Monitoring early-season agricultural drought using temporal Sentinel-1 SAR-based combined drought index".ENVIRONMENTAL MONITORING AND ASSESSMENT 195.8(2023).