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Analysis of Water Heat Flux and Drought based on Wetland Classification in the Yellow River Delta

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Abstract

To provide scientific basis for utilizing wetland resources, the drought conditions of different wetland types were evaluated in the Yellow River Delta. Based on the wetlands classification map, the difference in water and heat flux was studied, as well as the drought conditions in different wetlands. The relationship between the retrieved land surface temperature (LST) and evapotranspiration (ET) was analyzed through two section profiles in different directions using Geographic Information System (GIS) tools. The LST is relatively lower and the ET is relatively higher in areas mostly covered by wetlands of bush swamp, water body, saltern, and waterlogged lowland. On the whole, the ET values increase from inland to coastal areas, and the corresponding drought index decreases. There is a close negative correlation between ET and the regional water index (RWSI). The coefficients of the regression equations presented by different land use types such as swamp, built area, bush swamp, dry farmland, cultural pond, and other wetland types have slight differences. Generally, the non-wetland areas still show a large RWSI value, though the ET is relatively small. On the contrary, the artificial wetland is subjected to lower drought risk as indicated by its lower RWSI in spite of the high ET level. The RWSI of some natural wetland areas is larger than that of artificial ones, which indicates that proper utilization can reduce the drought risk to a certain extent in natural wetlands. Results showed that reasonable development of wetland resources may alleviate regional drought conditions.

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Data Availability

The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

This work was supported by Shandong Key Laboratory of Coastal Environmental Processes, YICCAS(2019SDHADKFJJ07), NSFC fund project (41876107), the National Key R&D Program of China(2019YFD0900705), NSFC fund project (31870468), Human and Social Science Project of Ministry of Education(17YJCZH174),Natural Science Foundation of Shandong Province(ZR2017MD015), and the Key Program of Shandong Natural Science Foundation, China (No. ZR2020KF031).

Funding

This research was funded by Shandong Key Laboratory of Coastal Environmental Processes, YICCAS(2019SDHADKFJJ07), NSFC fund project (41876107), the National Key R&D Program of China(2019YFD0900705), NSFC fund project (31870468), Human and Social Science Project of Ministry of Education (17YJCZH174),Natural Science Foundation of Shandong Province(ZR2017MD015), and the Key Program of Shandong Natural Science Foundation, China (No. ZR2020KF031).

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Analysis, Jicai Ning, Zhiqiang Gao and De Wang; methodology, Jicai Ning, and Yueqi Wang; and writing-review and editing, Jicai Ning, Xiaoqing Wu and Qiuxian Wang. All authors read and approved the final manuscript.

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Correspondence to De Wang.

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Ning, J., Gao, Z., Wu, X. et al. Analysis of Water Heat Flux and Drought based on Wetland Classification in the Yellow River Delta. Wetlands 43, 20 (2023). https://doi.org/10.1007/s13157-023-01666-7

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  • DOI: https://doi.org/10.1007/s13157-023-01666-7

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