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Climate Control on the Channel Morphodynamics of the Sittaung River, Myanmar = = 미얀마 시탕강의 형태동력학적 특성에 대한 기후 통제 /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Climate Control on the Channel Morphodynamics of the Sittaung River, Myanmar =/ Luke Stefan Bisson.
Reminder of title:	미얀마 시탕강의 형태동력학적 특성에 대한 기후 통제 /
Author:	Bisson, Luke Stefan,
Description:	1 electronic resource (57 pages)
Notes:	Source: Masters Abstracts International, Volume: 86-05.
Contained By:	Masters Abstracts International86-05.
Subject:	Environmental science. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30996810
ISBN:	9798342746359

Climate Control on the Channel Morphodynamics of the Sittaung River, Myanmar = = 미얀마 시탕강의 형태동력학적 특성에 대한 기후 통제 /
Bisson, Luke Stefan,

Climate Control on the Channel Morphodynamics of the Sittaung River, Myanmar =미얀마 시탕강의 형태동력학적 특성에 대한 기후 통제 /Luke Stefan Bisson. - 1 electronic resource (57 pages)

Source: Masters Abstracts International, Volume: 86-05.

The spatio-temporal development of a meandering river is controlled by its channel morphodynamics. In regions of rapid channel evolution, understanding the driving factors of meander migration is crucial in forecasting the rate and extent of morphological change. Sediment supply and fluvial discharge are the primary influences on migration rate, however climate oscillations are also integral in regulating migration rate through their control of regional precipitation, as well as the monsoon season of sub-tropical Asia. Despite this, an in-depth investigation into the impact of climate oscillations on meander bend migration remains undocumented. This study presents a satellite-based analysis of multi-decadal climatic forcing on the migration rate of the Sittaung River in Myanmar, through interpretation of the El Nino Southern Oscillation (ENSO). The mode of ENSO exerts significant climatic control on the migration rate of the meandering channels of the Sittaung River, with low-to-average migration rates recorded during dry El Nino events and peak migration rates observed during wet La Nina events. However, this climatic signal may have been obscured by certain local environmental conditions. In cases where meanders faced geological basement, the basement rock inhibited their migration through extension, forcing more rapid migration by way of seaward translation. Consequently, these translating meanders developed to be more elongate, with lower curvatures. Meanders downstream of the approximate tidal limit were less downstream skewed, indicative of tidal modulation, potentially obscuring the impact of fluvially driven climate forcing. Additionally, downstream of a major confluence, the input of sediment and fluvial discharge may have been regulated by upstream anthropogenic activities such as mining and dam construction, leading to greater variability in migration rate downstream of this confluence and further obfuscation of the climate signal.

English

ISBN: 9798342746359Subjects--Topical Terms:

677245
Environmental science.
Subjects--Index Terms:

Channel morphodynamics

Climate Control on the Channel Morphodynamics of the Sittaung River, Myanmar = = 미얀마 시탕강의 형태동력학적 특성에 대한 기후 통제 /
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245 1 0 $a Climate Control on the Channel Morphodynamics of the Sittaung River, Myanmar = $b 미얀마 시탕강의 형태동력학적 특성에 대한 기후 통제 / $c Luke Stefan Bisson.
264 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2024
300 $a 1 electronic resource (57 pages)
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500 $a Source: Masters Abstracts International, Volume: 86-05.
500 $a Advisors: Woo, Jusun; Choi, Kyungsik Committee members: Kim, Seongpil.
502 $b M.S. $c Seoul National University (Republic of Korea) $d 2024.
520 $a The spatio-temporal development of a meandering river is controlled by its channel morphodynamics. In regions of rapid channel evolution, understanding the driving factors of meander migration is crucial in forecasting the rate and extent of morphological change. Sediment supply and fluvial discharge are the primary influences on migration rate, however climate oscillations are also integral in regulating migration rate through their control of regional precipitation, as well as the monsoon season of sub-tropical Asia. Despite this, an in-depth investigation into the impact of climate oscillations on meander bend migration remains undocumented. This study presents a satellite-based analysis of multi-decadal climatic forcing on the migration rate of the Sittaung River in Myanmar, through interpretation of the El Nino Southern Oscillation (ENSO). The mode of ENSO exerts significant climatic control on the migration rate of the meandering channels of the Sittaung River, with low-to-average migration rates recorded during dry El Nino events and peak migration rates observed during wet La Nina events. However, this climatic signal may have been obscured by certain local environmental conditions. In cases where meanders faced geological basement, the basement rock inhibited their migration through extension, forcing more rapid migration by way of seaward translation. Consequently, these translating meanders developed to be more elongate, with lower curvatures. Meanders downstream of the approximate tidal limit were less downstream skewed, indicative of tidal modulation, potentially obscuring the impact of fluvially driven climate forcing. Additionally, downstream of a major confluence, the input of sediment and fluvial discharge may have been regulated by upstream anthropogenic activities such as mining and dam construction, leading to greater variability in migration rate downstream of this confluence and further obfuscation of the climate signal.
520 $a 사행하천의 시공간적 발달양상은 수로의 형태동력학적 특성에 의해 결정된다. 특히 수로의 발달이 급격하게 이루어지는 지역에서 수로 이동의 제어요인을 이해하는 것은 수로 형태 변동성의 속도와 규모를 예측하는데 중요하다. 퇴적물 공급과 하천 유량이 수로 이동률에 주요 변수로 작용하지만, 지역의 강수량을 조절하는 아열대 아시아의 몬순과 주기적인 기후 변동성 또한 수로의 형태변동성에 핵심적인 역할을 한다. 수로의 형태변동성에 대한 기후의 중요성에도 불구하고 주기적인 기후 변동성이 사행하천의 이동에 미치는 영향에 대한 심층적인 연구는 부족한 상황이다. 본 연구는 최근 수십년간 위성영상 분석을 통해 엘니뇨-남방진동이 미얀마 시탕강의 형태변동성에 미친 영향을 규명하고자 한다. 엘니뇨-남방진동은 시탕강의 형태변동성과 밀접한 관련이 있으며, 건조한 엘니뇨 시기 보다는 습한 라니냐 시기에 수로의 형태변동성이 상대적으로 현저하게 발생하는 경향을 보인다. 기후 변동성과 시탕강의 형태변동성간의 상관관계가 뚜렷하지 않는 경우도 존재하는데 이는 지역적인 환경 요인에 의한 것으로 해석된다. 사행하천이 단단한 기반암에 접촉하는 경우에는, 하천이 확장형태로 측면이동하지 않고 하류방향으로 빠른속도로 병진이동하는 특성을 보인다. 결과적으로, 병진이동하는 하천의 만곡부는 더 신장되고 상대적으로 작은 곡률을 가진다. 조석 한계의 하류에 분포하는 하천의 만곡부들은 대체적으로 하류방향으로 덜 치우쳐진 비대칭성을 가지는데 이는 기후의 제어요인에 의한 하천의 형태변동성이 조석의 변조로 인해 상대적으로 약화되었기 때문인 것으로 해석된다. 추가적으로, 주요 합류점의 하류에 위치한 만곡부에서 수로 이동률의 변동성이 크고 기후 요인과의 상관관계가 뚜렷하지 않는 경우가 많은데 이는 합류점 상류지역에서 광산활동이나 저수지 건설 등 인위적인 활동으로 인해 유입되는 퇴적물과 유량이 국지적으로 조절되었기 때문인 것으로 판단된다.
546 $a English
590 $a School code: 1960
650 4 $a Environmental science. $3 677245
650 4 $a Geomorphology. $3 542703
650 4 $a Remote sensing. $3 535394
650 4 $a Climate change. $2 bicssc $3 2079509
653 $a Channel morphodynamics
653 $a Climate oscillations
653 $a ENSO
653 $a Meander migration rate
653 $a Myanmar
653 $a Sittaung River
690 $a 0768
690 $a 0484
690 $a 0799
690 $a 0404
710 2 $a Seoul National University (Republic of Korea). $b Earth and Environmental Sciences. $e degree granting institution. $3 3815249
720 1 $a Woo, Jusun $e degree supervisor.
720 1 $a Choi, Kyungsik $e degree supervisor.
773 0 $t Masters Abstracts International $g 86-05.
790 $a 1960
791 $a M.S.
792 $a 2024
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30996810