Spatiotemporal variation of Gaoping River plume observed by Formosat-2 high resolution imagery

Chung, Hsiao Wei; Liu, Cheng Chien; Chiu, Yu-Chen; Liu, J. T.

doi:10.1016/j.jmarsys.2013.12.011

Cited by 9 publications

(5 citation statements)

References 53 publications

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“…Previous studies in the Bohai, Yellow, South, and East China Seas [27,48] have shown that the high abundance of Pseudomonadota and Plancytomycetes could be due to the environmental eutrophication. Pseudomonadota is critical for the degradation of the organic nitrogen in sediments [49,50], and Planctomycetota play important biogeochemical roles in anaerobic ammonium oxidation [38], methane oxidation [51], and carbon recycling [42]. Both phyla are chemotrophic bacteria, and their high abundance might reflect the high concentration of relative chemicals in the environment [52].…”

Section: Diverse and Dynamic Microbial Community Structure On Liuqiu ...mentioning

confidence: 99%

“…In addition to the KBC, SCSSC, and upwelling, the plume of the Gaoping River induced by a typhoon or heavy rainfall also affected the near-shore environment of Liuqiu Island [38,39,109]. The plume brought abundant nutrients, sediments, freshwater, and pollutants from the Gaoping River Basin into Liuqiu Island and shaped its near-shore environment suddenly.…”

Section: Prospect Of Long-term Monitoringmentioning

confidence: 99%

“…The average water temperature is 25.0 °C in January and is 29.4 °C in July. The sea area around Liuqiu Island is affected by the Kuroshio tributary, the southwest blowing current and the plume of the Gaoping River [38,39]. The environments of the coral reefs around the island are different.…”

Section: Introductionmentioning

confidence: 99%

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Microbial Community Diversity of Coral Reef Sediments on Liuqiu Island, Southwestern Taiwan

Wang¹,

Liu²

2023

JMSE

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Microbes in coral reef sediments are thought to play an important role in organic matter remineralization and nutrient recycling. Microbial communities also reflect the environmental conditions, such as nutrient status, of an ecosystem. This study investigates the relationship between microbial community diversity in the reef sediments and environmental conditions at Liuqiu Island. We sampled sediments seasonally from four sites around the island, Beauty Cave, Geban Bay, Houshi Fringing Reef, and Lobster Cave, from 2015–2020. The V5–V6 hypervariable region of 16S rRNA was amplified and sequenced using the Illumina MiSeq platform to identify the microbial communities. The results showed that the high abundance of Pseudomonadota, Planctomycetota, and Bacteroidota might reflect the eutrophic environments of the sediments on Liuqiu Island. Second, the identification of putative pathogens and human-related genera suggests that human activities have affected the marine environment of Liuqiu Island. Third, the insignificant spatial differences and the significant temporal differences in the microbial communities of Liuqiu Island indicate that annual or periodical events, such as the Kuroshio Branch Current and South China Sea Surface Current, could shape the microbial communities of Liuqiu Island. Furthermore, the abundance of human-related genera—Cutibacterium, Herbaspirillum, Corynebacterium 1, Escherichia-Shigella, and Kocuria—increased dramatically in the Lobster Cave site in September 2015 and may have been induced by a strong climate event, such as a typhoon or heavy rainfall. Our results revealed that the microbial communities of Liuqiu Island are dynamic and sensitive to adjacent environmental conditions. The sedimented microbial communities could monitor the bacteria and pathogens related to human activities and even reveal the putative events that could affect the ecological environments.

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Section: Diverse and Dynamic Microbial Community Structure On Liuqiu ...mentioning

confidence: 99%

Section: Prospect Of Long-term Monitoringmentioning

confidence: 99%

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Microbial Community Diversity of Coral Reef Sediments on Liuqiu Island, Southwestern Taiwan

Wang¹,

Liu²

2023

JMSE

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“…Apart from monitoring and detecting barrier lakes, comparing the pre-and post-event images acquired by Formosat-2 is also advantageous in terms of examining water conservancy facilities, including dikes, revetments, water intake and drainage facilities, canals, culverts, reservoirs, dams, and affiliated structures. Some examples include mapping the coverage of driftwood in Shimen Reservoir caused by Typhoon Soulik, tracking the spatiotemporal variation of the Gaoping River plume [14], and monitoring reservoir water quality [12]. However, when it comes to the original goal of FPERS-flood prevention and management-the optical imagery acquired from the spaceborne platforms tends to be limited by clouds.…”

Section: Optical Satellite Imagerymentioning

confidence: 99%

Flood Prevention and Emergency Response System Powered by Google Earth Engine

Liu

Shieh²,

et al. 2018

Remote Sensing

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This paper reviews the efforts made and experiences gained in developing the Flood Prevention and Emergency Response System (FPERS) powered by Google Earth Engine, focusing on its applications at the three stages of floods. At the post-flood stage, FPERS integrates various remote sensing imageries, including Formosat-2 optical imagery to detect and monitor barrier lakes, synthetic aperture radar imagery to derive an inundation map, and high-spatial-resolution photographs taken by unmanned aerial vehicles to evaluate damage to river channels and structures. At the pre-flood stage, a huge amount of geospatial data are integrated in FPERS and are categorized as typhoon forecast and archive, disaster prevention and warning, disaster events and analysis, or basic data and layers. At the during-flood stage, three strategies are implemented to facilitate the access of the real-time data: presenting the key information, making a sound recommendation, and supporting the decision-making. The example of Typhoon Soudelor in August of 2015 is used to demonstrate how FPERS was employed to support the work of flood prevention and emergency response from 2013 to 2016. The capability of switching among different topographic models and the flexibility of managing and searching data through a geospatial database are also explained, and suggestions are made for future works.

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“…The Gaoping River consists of five main tributaries: the Chishan, Laonong, Zhoukou, Bulao and Ailiao Rivers. While the total length (171 km) and drainage area (3257 km 2 ) are relatively small compared to other river basins in East Asia, it has high amounts of sediment (3.6 × 10 7 MT) and a large discharge (8.46 × 10 9 m 3 ) [23]. The large sediment influx is the result of high rates of erosion influenced by the frequent typhoons and a seasonal wet season (~3000 mm/year).…”

Section: Study Areamentioning

confidence: 99%

Modeling Typhoon‐Induced Alterations on River Sediment Transport and Turbidity Based on Dynamic Landslide Inventories: Gaoping River Basin, Taiwan

Chang

Harrison

Huang

2015

Water

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This study examines the impacts of storm-triggered landslides on downstream sediment and turbidity responses in the Gaoping River Basin, Taiwan using the Soil and Water Assessment Tool (SWAT). Attention is given to analyzing the increased and altered baseline of suspended sediment load and turbidity after the disturbances caused by the rainfall and landslides associated with Typhoon Morakot in 2009. SWAT parameters were calibrated by the observed hydrometric data from 1999 to 2003 using the log-scale root-mean-square error (log-RMSE) and Nash-Sutcliffe Model Efficiency. Both parameter sets were applied for the simulation of suspended sediment yield and turbidity with annual updated landslide inventories for the period 2004-2012. The landslide updating mirrors the physical land-cover changes and has slightly improved the model performance, yet landslides alone cannot explain the difference between Morakot-induced and SWAT-simulated sediment discharge. The set of parameters calibrated by log-RMSE can better approximate the increased baseline and typhoon induced alterations. The results show alterations in sediment erosion and transport: (1) drastically increased the turbidity baseline and occurrence of high-turbidity; (2) altered coefficient and exponent values of the sediment rating curve; and (3) altered relationship between rainfall and induced turbidity during major rainfall events. The research in this study provides an improved modeling approach to typhoon-induced alterations on river sediment loads and turbidity.

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Spatiotemporal variation of Gaoping River plume observed by Formosat-2 high resolution imagery

Cited by 9 publications

References 53 publications

Microbial Community Diversity of Coral Reef Sediments on Liuqiu Island, Southwestern Taiwan

Microbial Community Diversity of Coral Reef Sediments on Liuqiu Island, Southwestern Taiwan

Flood Prevention and Emergency Response System Powered by Google Earth Engine

Modeling Typhoon‐Induced Alterations on River Sediment Transport and Turbidity Based on Dynamic Landslide Inventories: Gaoping River Basin, Taiwan

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