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You searched for subject:(small mountainous river). Showing records 1 – 3 of 3 total matches.

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NSYSU

1. Lu, Jung-Tai. Distributions and Characteristics of Saturated Aliphatic Alkanes in Zhuoshui River and Taiwan Strait Sediments.

Degree: Master, Department of Oceanography, 2013, NSYSU

Vegetation changes caused by varied climatic conditions may leave fingerprint in sediments like lipids so-called molecular fossils or biomarkers. The concentration of n-alkanes and derived biological indicators (biomarkers) have been well-used on reconstructing paleoenvironment and paleoclimate variations, whereas degree of biodegradation/thermodegradation and dilutive influence from lithic organic compounds are still not constrained very well yet. In this study, we used biomarkers not only seeking for tracing sediment sources but also for reconstructing paleoenvironmental changes of source regions. For getting better understanding of the background knowledge of organic lipids and for evaluating the possibility of using biomarkers as indicators on reconstructing paleoclimatic and paleoenvironmental changes at the region of central part of Taiwan, riverine sediments, soils and rocks are recovered from the catchment of Zhuoshui River for analyzing total organic carbon and aliphatic lipids. In soil samples, the carbon distribution pattern of n-alkanes is dominated by n-C31 and n-C29, which are typical higher plants derived signals. However, the rock samples contain only minor organic matters and no predominant carbon species are found. Our results also have shown that hydrocarbon compounds in riverine sediments and suspended particles are mainly composted of short- and medium-carbon chain alkanes (n-C16-25), which might indicate to the possible contributions from unicellular organisms (such as diatoms). Concentrations of higher plant derived n-alkanes of surface sediments retrieved from the Taiwan Strait are low. This result indicates that there might be other sources of hydrocarbons besides the terrestrial plants and may be diluted by short-chain alkanes coming from marine organisms and lithic hydrocarbons. Therefore, we conclude that there are about 1.9-3.8 kt yr-1 (0.35-0.69 Mt TOC-1 yr-1) of rock-sourced hydrocarbons are discharged into the Taiwan Strait by Zhuoshui River. Advisors/Committee Members: Chih-An Huh (chair), Yuan-pin Chang (committee member), James-T. Liu (chair), Hui-Ling Lin (chair).

Subjects/Keywords: Small Mountainous River; Zhuoshui River; Taiwan Strait; Biomarkers; n-Alkanes

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Lu, J. (2013). Distributions and Characteristics of Saturated Aliphatic Alkanes in Zhuoshui River and Taiwan Strait Sediments. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0730113-120416

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Lu, Jung-Tai. “Distributions and Characteristics of Saturated Aliphatic Alkanes in Zhuoshui River and Taiwan Strait Sediments.” 2013. Thesis, NSYSU. Accessed October 17, 2019. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0730113-120416.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Lu, Jung-Tai. “Distributions and Characteristics of Saturated Aliphatic Alkanes in Zhuoshui River and Taiwan Strait Sediments.” 2013. Web. 17 Oct 2019.

Vancouver:

Lu J. Distributions and Characteristics of Saturated Aliphatic Alkanes in Zhuoshui River and Taiwan Strait Sediments. [Internet] [Thesis]. NSYSU; 2013. [cited 2019 Oct 17]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0730113-120416.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Lu J. Distributions and Characteristics of Saturated Aliphatic Alkanes in Zhuoshui River and Taiwan Strait Sediments. [Thesis]. NSYSU; 2013. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0730113-120416

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


NSYSU

2. Hsu, Tun-jui. Sediment dynamics study in the source-to-sink process through the Gaoping river-sea system.

Degree: PhD, Department of Oceanography, 2014, NSYSU

The complex interplay between tectonic and climate activities shapes the Earthâs surface and produces large amounts of sediments conveying from land to the sea. Therefore, more than 20 billion tons of sediments is exported to the ocean each year. There is approximately 70% of the global fluvial sediment discharge from the orogens in southern Asia and high-standing islands fringing the Pacific and Indian Oceans. The contribution by small mountainous rivers (SMR) to the world oceanâs sediment budget in this region, although significant, has often been underestimated. Therefore, the research in the sediment dynamics is necessary for evaluating the sediment budget from SMR to the basin. The Gaoping River (GPR) has high sediment yield whose ranking is the 12th in the world and connects to the head of the Gaoping Submarine Canyon (GPSC) just 1 km apart. Moreover, the GPSC cuts through the Gaoping shelf and slope and merges into the Manila Trench which eventually links to the South China Sea. Therefore, this dispersal system is an ideal play for studying the dynamics of the source-to sink (S2S) processes. This dissertation presents field investigations in the GPR estuary, hypopycnal plume area, and GPSC. Because of the complexity of the GPR-GPSC dispersal system, multidiscipline and different approaches were adopt in the different region in the system. In the estuary and the plume area, both temporal and spatial schemes were conducted to measure the hydrodynamic, hydrographic, water samples, and sediment samples. In the GPSC, three sediment trap moorings with CTD, OBS, and ADCP were deployed during the dry, flood season, and after the typhoon, respectively. In the estuary, the interaction between river flow and tidal oscillation produces two layered circulation which flows downstream in the top-core layer and upstream in the near bed layer. A dynamic sediment barrier was found in the lower reach of the estuary. Except extreme floods, river effluents spread over the coast seawater through the hypopycnal processes. Most effluent sediments transport along the coastal jet and deposit in the coastal or near-shore ocean. In the GPSC, canyons, major sediment transport and rapid sediment deposition occur in the benthic nepheloid layer (BNL). Sediments in the hyperpycnal plume are trapped in the head region of the submarine canyon during the normal condition and flow down the canyon conduit to the deep basin during extreme floods. We also captured the warm water and suspended sediment carried by passing turbidity currents that originated in the adjacent GPR. Advisors/Committee Members: Jingping Xu (chair), Ruo-Shan Tseng (chair), James T. Liu (committee member), Chon-Lin Lee (chair), Chih-chieh Su (chair).

Subjects/Keywords: small mountainous river; submarine canyon; hypopycnal plume; typhoon; hyperpycnal turbidity current; sediment dynamics; sinking particles

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Hsu, T. (2014). Sediment dynamics study in the source-to-sink process through the Gaoping river-sea system. (Doctoral Dissertation). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0810114-174831

Chicago Manual of Style (16th Edition):

Hsu, Tun-jui. “Sediment dynamics study in the source-to-sink process through the Gaoping river-sea system.” 2014. Doctoral Dissertation, NSYSU. Accessed October 17, 2019. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0810114-174831.

MLA Handbook (7th Edition):

Hsu, Tun-jui. “Sediment dynamics study in the source-to-sink process through the Gaoping river-sea system.” 2014. Web. 17 Oct 2019.

Vancouver:

Hsu T. Sediment dynamics study in the source-to-sink process through the Gaoping river-sea system. [Internet] [Doctoral dissertation]. NSYSU; 2014. [cited 2019 Oct 17]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0810114-174831.

Council of Science Editors:

Hsu T. Sediment dynamics study in the source-to-sink process through the Gaoping river-sea system. [Doctoral Dissertation]. NSYSU; 2014. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0810114-174831


NSYSU

3. Yang, Jen-kai. Land-sea duel and environmental change in the late Quaternary at the Zhuoshui River mouth.

Degree: PhD, Department of Oceanography, 2017, NSYSU

Taiwan is on the plate boundary thus having a fragile geological environment. After the late Quaternary, the rising sea level provides accommodating space for sediment accumulation along the coast and at river mouths. Those sediments recorded the environmental change accompanying the rising sea level. In this study, the FATES-HYPERS team took two cores around the Zhuoshui River mouth (JRD-N, JRD-S), each was about 100 m long. Sedimentological analyses were carried out on the cores. Samples containing organic carbon were picked out and sent for AMS 14C analysis to build an age model. The age model and sedimentary facies results combining with other previous sea level studies allowed reconstruction of the environment change with the sea level rise at the Zhuoshui River mouth. In addition, through the Empirical Orthogonal/Eigen Function (EOF) analysis on variables from non-destructive measurements provides objective determination of environment change in the late Quaternary at the Zhuoshui River mouth. From the sedimentary facies analysis and foraminifera analysis by others that the study site was initially terrestrial under fluvial control before 10,000 yr BP (before present). The findings indicate that the main course of the paleo-Zhuoshui River was closer to the JRD-N site at the time. Beginning at about 10,000 yr BP the site became inundated by the rising sea and the environmental facies transitioned from a floodplain/incised river valley to a succession of marine environments, from shoreface to offshore. As the rising sea level came to a pause at 6000 yr BP, fluvial processes became dominant again and sediments began to aggrade at the river mouth. After the sea level become stable, the accumulated sediment began to prograde seaward, taking on the form of a river delta, and subtidal sand ridges appeared in the nearshore. This also ushered in the deltaic development, which was limited by the topography of the receiving basin. The results of EOF also objectively reveal major patterns of environment change in the first three dominant modes. The first eigenmode explains about 30 % of the correlations. This mode mainly describes the variability of the grain-size distribution, which suggests the dynamics in the deposition process. The second eigenmode explains about 18 % of the correlations. This mode indicates the position of paleosoil-like layers, indicating exposure to the air. The third eigenmode explains about 17 % of the correlations. This mode mainly explains the differences between sediment weathering and transport, which exposes the rapid transport pattern in a small mountainous river system. The chronology expresses the duel between sea and fluvial processes that determined the depositional environment change along the land-sea boundary at the study site. Advisors/Committee Members: Daidu Fan (chair), Yuan-Pin Chang (chair), Hui-Ling Lin (chair), Chih-Chieh Su (chair), James T. Liu (committee member).

Subjects/Keywords: Depositional environment; Land-sea boundary; Facies association; Sea level; Small mountainous river

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Yang, J. (2017). Land-sea duel and environmental change in the late Quaternary at the Zhuoshui River mouth. (Doctoral Dissertation). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0620117-174357

Chicago Manual of Style (16th Edition):

Yang, Jen-kai. “Land-sea duel and environmental change in the late Quaternary at the Zhuoshui River mouth.” 2017. Doctoral Dissertation, NSYSU. Accessed October 17, 2019. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0620117-174357.

MLA Handbook (7th Edition):

Yang, Jen-kai. “Land-sea duel and environmental change in the late Quaternary at the Zhuoshui River mouth.” 2017. Web. 17 Oct 2019.

Vancouver:

Yang J. Land-sea duel and environmental change in the late Quaternary at the Zhuoshui River mouth. [Internet] [Doctoral dissertation]. NSYSU; 2017. [cited 2019 Oct 17]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0620117-174357.

Council of Science Editors:

Yang J. Land-sea duel and environmental change in the late Quaternary at the Zhuoshui River mouth. [Doctoral Dissertation]. NSYSU; 2017. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0620117-174357

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