• 제목/요약/키워드: Coastal lagoon

검색결과 37건 처리시간 0.029초

APPLICATION OF REMOTE SENSING FOR COASTAL HAZARD MONITORING IN TAM GIANG - CAU HAI LAGOON, VIETNAM

  • Dien, Tran Van;Lan, Tran Dinh;Huong, Do Thu
    • 대한원격탐사학회:학술대회논문집
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    • 대한원격탐사학회 2006년도 Proceedings of ISRS 2006 PORSEC Volume I
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    • pp.455-458
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    • 2006
  • Stretching on the coastline of 70 km, the Tam Giang - Cau Hai Lagoon plays a very important role for the coastal ecology and socio-economic development of Hue region where was Vietnam's Ancient Kingdom Capital and recognized as a World's Cultural Heritage. Recently, coastal hazard in the lagoon have occurred seriously such as inlet movement and fill up, coastal erosion, flood and inundation, etc. These hazards have impacted on lagoon environment, resources, ecosystems, socio-economic and sustainable development of this coastal area. This paper present a case study using remote sensing data in combination with ground survey for monitoring the coastal hazards in Tam Giang - Cau Hai lagoon in recent decades. Analysis results find that during its natural evolution, the lagoon has been being in three situations of only one, two and three inlets. When inlets opened or displaced, coastal erosion have occurred seriously toward new balance condition. Flood and inundation occurs every rainy season in lowland plain around lagoon. The historical flood happened in early of November 1999 with six days long, created very terrible damages for Thua Thien Hue province. Remote sensing data with capability of regular update, large area coverage is effective provide real-time and continuous information for coastal hazards monitoring.

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Spatial distribution and temporal variation of hydrogeochemistry in coastal lagoons and groundwater on the eastern area of korea

  • Chanyoung Jeong;Soo Min Song;Woo-Hyun Jeon;Hee Sun Moon
    • 한국수자원학회:학술대회논문집
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    • 한국수자원학회 2023년도 학술발표회
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    • pp.247-247
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    • 2023
  • Coastal lagoons play a crucial role in water exchange, water quality, and biodiversity. It is essential to monitor and understand the dynamics of hydrogeochemistry in lagoon water and its groundwater to preserve and sustainably manage the groundwater-dependent ecosystems like coastal lagoons. This study investigated the spatial and temporal hydrogeochemical characteristics of coastal lagoon (Songjiho) and groundwater on the east coast of Korea. The concentrations of major ions, water isotopes, and nutrients (nitrogen and dissolved organic carbon) in lagoon water and groundwater were periodically monitored for one year. The study revealed that major ions and total dissolved solids (TDS) concentration were higher at deeper depths of aquifers and closer to the coastal area. The hydrogeochemical characteristics of coastal lagoon and groundwater chemistry were classified into two types, Ca-Mg-HCO3 and Na-Cl, based on their spatial location from inland to coastal area. Moreover, the hydrogeochemical characteristics of coastal lagoons and groundwater varied significantly depending on the season. During the wet season, the increased precipitation and evaporation lead to changes in water chemistry. As a result, the total organic carbon (TOC) of coastal lagoons increases during this season, likely due to increased runoff by rainfall whereas the variation of chemical compositions in the lagoon and groundwater were not significant because there is reduced precipitation, resulting in stable water levels and during the dry season. The study emphasizes the impact of spatial distribution and seasonal changes in precipitation, evaporation, and river discharge on the hydrogeochemical characteristics of the coastal aquifer and lagoon system. Understanding these impacts is crucial for managing and protecting coastal lagoons and groundwater resources.

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Overfishing and recent risk for collapse of fishery in coastal Mediterranean lagoon ecosystem (Karavasta lagoon, southeastern Adriatic sea)

  • Spase Shumka;Yukio Nagahama;Sarjmir Hoxha;Koji Asano
    • Fisheries and Aquatic Sciences
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    • 제26권4호
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    • pp.294-303
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    • 2023
  • Beside that the fish species and their sub-populations are highly important as a keystone species in the coastal and marine ecosystem, there are very few studies on their presence, distribution and temporal variations within and around the lagoon ecosystems in Albania. This paper provides an updated review on the life cycle, fishery, exploitation state and management of the main species that are subject of commercial fishing in the Karavasta lagoon, southeastern Adriatic coast of Albania. Due to the fact that lagoons represent a continuum between continental and marine aquatic ecosystems they play a crucial role in species life cycles. Further on in the circumstances of rapid utilizations and environmental changes, anomalies in salinity and temperatures, accelerated anthropogenic influences their rate of vulnerability is highly increased. Following the requirements of the Water Framework Directive, transitional water, coastal lagoons and estuaries there is a need for urgent monitoring and management approaches. The commercial species include: European eel (Anguilla anguilla), species of Family Mugilidae (Mugil cephalus, Liza ramada, Liza salienes and Chelon labrosus), Seabream (Sparus aurata), Seabass (Dincentrarchus labrax), etc. Fish productivity is oscillating from maximum value of 61.95 kg/ha is recorded in period of 1975-80 and lower value of 31 kg/ha in year 2020. Our study highlights importance of fish and fishery long-term monitoring, and contributes to understand the driving factors in productivity, migration patterns and species ecology in the vital coastal ecosystems.

수리화학적 환경 추적자를 이용한 강원도 석호지역에서의 지하수-지표수 상호작용에 대한 연구 (Determining Groundwater-surface Water Interaction at Coastal Lagoons using Hydrogeochemical Tracers)

  • 김동훈;이정윤;조수영;문희선;정윤영;박예진;오용화
    • 한국지하수토양환경학회지:지하수토양환경
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    • 제28권2호
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    • pp.1-11
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    • 2023
  • Groundwater-surface water interaction was evaluated using water quality parameters (temperature and electrical conductivity), distributions of stable water isotopes (δ2H and δ 18O), and Rn-222 in lagoon water, groundwater, and seawater at three coastal lagoons (Songji (SJ), Youngrang (YR), and Sunpo (SP) Lagoon) in South Korea. From the results of composition and distributions of δ2H and δ18O, it was found that groundwater fraction of lagoon water in YR Lagoon (76%) was slightly higher than those of SJ (42%), and SP (63%) Lagoon. Based on Rn-222 mass balance model, groundwater discharge into SJ Lagoon in summer 2020 was estimated to be (3.2±1.1)×103 m3 day-1, which showed a similar or an order of magnitude higher than the results of previous studies conducted in coastal lagoons. This study can provide advanced techniques to evaluate groundwater-surface water interaction in coastal lagoons, wetlands, and lakes, and help to determine the effects of groundwater on coastal ecosystems.

Characterization of a Unique New Strain Named the NFRDI N°1 Rotifer Strain, a Brackish Brachionus Rotifer Collected from a South Korea Coastal Lagoon

  • Jung, Min-Min
    • Fisheries and Aquatic Sciences
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    • 제14권4호
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    • pp.333-337
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    • 2011
  • A new and a unique Brachionus rotifer was found in Hwajinpo coastal lagoon in Gangwon Province, South Korea. This Brachionus certainly originated from the wild rather than from aquaculture stations because Hwajinpo coastal lagoon has been under rigorous control as a military protected area and therefore could not have been contaminated by aquaculture stations. The new strain was identified as Brachionus rotundiformis based upon its morphological characteristics. The parthenogenetic female of this new rotifer strain typically shows characters similar to those of B. rotundiformis, such as the pot shape of the body, rounded dorsal plate compared with flattened ventral plate, elliptical mictic egg, four frontal spines, six pointed occipital spines, non-nodal foot, two toes, trophi typical of the Brachionus genus with five uncus plates resembling comb teeth, one wide symmetrical manubrium and ramus, and no stiffened spine as is seen in freshwater Brachionus rotifers. Moreover, its lorica was rather small in size compared with other common rotifer strains that serve as live-food organisms (Guam, Thai, and Bali strains). This new and unique Korean brackish rotifer, a B. rotundiformis strain, was therefore named the National Fisheries Research and Development Institute (NFRDI) $N^{\circ}1$ rotifer strain.

Characterization of macro-benthic fauna for ecological health status of the Fosu and Benya lagoons in coastal Ghana

  • Armah, Frederick A.;Ason, Benjamin;Luginaah, Isaac;Essandoh, Paul K.
    • Journal of Ecology and Environment
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    • 제35권4호
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    • pp.279-289
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    • 2012
  • This study conducted a comparative analysis of benthic macroinvertebrate communities in the Fosu and Benya lagoons in Ghana, based on the anthropogenic effect on the two lagoons. Salinity, oxygen, temperature, conductivity, turbidity and pH were measured, invertebrate richness and species densities were determined. The AZTI Marine Biotic Index (AMBI) and multivariate statistics were used to determine the different responses of fauna to pollution. The fauna were categorized into five ecological groups based on the degree of tolerance of the different species to pollution: disturbance-sensitive species; disturbance-indifferent species, disturbance-tolerant species, second-order opportunistic species; and first-order opportunistic species. The Fosu Lagoon supported more pollution tolerant species, whereas the Benya Lagoon had more species that were sensitive to organic enrichment under relatively unpolluted conditions. Chironomus sp., which is adapted to virtually anoxic conditions, was the most abundant in the Fosu Lagoon whereas Nemertea sp. was the most abundant in the Benya Lagoon. The numerical and relative abundance (%) of all 7 taxa in the Fosu Lagoon was 1,359 and 92.35%, respectively. The numerical and relative abundance (%) of all 34 taxa in the Benya Lagoon was 2,459 and 87.52%, respectively. Expectedly, the level of dissolved oxygen in the less saline Fosu Lagoon was higher than that in the more saline Benya Lagoon. The reduced photoperiod and photosynthetic activities of aquatic plants might account for this trend. There is a need to implement comprehensive monitoring and management initiatives for sustaining the ecological health of coastal lagoons in Ghana in order to support the many people that depend upon these ecosystems for their livelihood.

강원도 양양군 쌍호, 가평리습지, 궁개호, 염개호의 20세기 경관 변화 (Landscape Changes during the 20th Century of Ssangho, Gapyeongri wetland, Gunggaeho and Yeomgaeho, Yangyang-gun, Gangwon Province)

  • 윤순옥;황상일;박충선;진민경
    • 한국지형학회지
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    • 제17권4호
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    • pp.41-52
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    • 2010
  • 양양군 오산리 일대에는 쌍호, 가평리습지, 궁개호와 염개호 등 4개의 석호가 높은 밀도로 나타난다. 쌍호는 동해안의 대표 석호군과 함께 해진극상기에 하구부가 익곡되어 현재까지 호수를 유지하고 있으나, 가평리습지와 궁개호, 염개호는 사빈의 제간습지에 형성되었다. 20세기동안 4개 석호는 대체로 축소 및 위치변화 정도가 심한데, 그 원인을 자연적인 요인과 인간의 영향, 그리고 기타 요인으로 구분하여 검토하였다. 지형발달에 따른 매적단계와 함께 20세기동안 급속하게 진행된 산업화와 개발에 따른 매립, 소규모 석호의 존재가치에 대한 인식 부족이나 지도 작성시 오류, 그리고 측량기술의 낙후성에 기인한다. 따라서 경관 복원 계획은 석호의 성격에 따라 다르게 진행되어야 하며, 쌍호를 우선적으로 복원하는 것이 권장되며, 인간의 영향이 최소한 미쳤던 1920년대의 지형으로 되돌리는 것이 바람직하다.

송지호 해안 대수층 미생물 군집의 풍부도 및 다양성 (Abundance and Diversity of Microbial Communities in the Coastal Aquifers in Songji Lagoon, South Korea)

  • 이정윤;김동훈;전우현;문희선
    • 한국지하수토양환경학회지:지하수토양환경
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    • 제28권5호
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    • pp.12-24
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    • 2023
  • The Songji lagoon is brackish environment with a mixture of saline and fresh water, and the interaction of groundwater-lagoon water creates a physicochemical gradient. Although some studies have been conducted on the hydrological and geochemical characteristics of the Songji lagoon, microbial ecological studies have not yet been conducted. In this study, we investigated the effect of groundwater and surface water interaction on water quality as well as microbial community changes in the Songji Lagoon using 16S rRNA gene sequencing. Hydrochemical analyses show that samples were classified as 5 hydrochemical facies (HF) and hydrochemical facies evolution (HFE) revealed the intrusion phase was more dominant (57.9%) than the freshening phase (42.1%). Higher microbial diversity was found in freshwater in comparison to saline water samples. The microbial community at the phylum level shows the most dominance of Proteobacteria with an average of 37.3%, followed by Bacteroidota, Actinobacteria, and Patescibacteria. Heat map analyses of the top 18 genera showed that samples were clustered into 5 groups based on type, and Pseudoalteromonas could be used potential indicator for seawater intrusion.

강원도 동해안(송지호) 해안퇴적층의 제4기 후기 층서와 중광물 (Late Quaternary Stratigraphy and the Heavy Minerals from Deep Cored Sediments along the Coastal Deposits, Songji Lagoon, Eastern Coast, Korea)

  • 박용안;박영후
    • 한국제4기학회지
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    • 제15권2호
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    • pp.111-117
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    • 2001
  • 강원도 동해안 송지호(석호: lagoon)의 해안 퇴적층(석호입구 사립 퇴적층)에서 실시된 심부 시추 퇴적층에 대한 퇴적학적인 제4기 후기 층서설정과 환경연구 결과가 현세 해수면 상승곡선이 서로 대비되어 해석되었다. 중광물 함량의 변화가 퇴적층서 단위별로 차이를 나타내는 사실은 육성 퇴적 환경에서 해안 해빈 환경으로의 진화과정을 뒷바침한다.

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강원도 양양 오산리 쌍호 일대 Holocene 환경변화 (Environmental Change around the Coastal Lagoon Ssangho, Osan-ri, Yangyang-county, Gangwon-province in the Korean Peninsula)

  • 윤순옥;황상일
    • 한국지형학회지
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    • 제17권2호
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    • pp.41-52
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    • 2010
  • 양양 오산리 쌍호 일대의 신석기 유적지가 입지한 해안사구(S1)와 쌍호 가장자리 충적층(S4)에서 얻은 토양으로 화분분석을 행하고, 두 지점의 지형특성과 관련하여 고식생환경을 복원하였다. 신석기 유구 위에 퇴적된 해안사구(S1)의 저습지는 약 4,000년 BP 경부터 형성되었던 것으로 추정된다. 흑송(해송)이 전 시기동안 번성하였으며, 약 2,000년 BP를 경계로 화분대가 구분되었다. 화분대 I시기는 AP가 우점한 가운데 국화과가 우세하였고, 화분대 II는 벼과, 쑥속, 메밀 등을 중심으로 하는 NAP 우점기로서 농경 시기의 특징을 보였다. 쌍호 가장자리 충적층(S4)에서는 상부유기질층이 형성될 때, 습지 가장자리에서 번성한 오리나무속을 중심으로 하는 낙엽활엽수림과 벼과, 쑥속, 국화과, 부들속, 산형과, 여뀌속이 번성하였다. 전 시기동안 초본화분(NAP)이 목본(AP)에 비해 우점하므로, 해안사구(S1)의 화분대 II시기와 대비된다.