• 한국작물학회:학술대회논문집
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• 한국작물학회 2001년도 추계 학술대회지
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• pp.59-71
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• 2001

In Korea, It was natural and inevitable to reclaim tidal land for farming due to over-population in small territory. Looking back upon the history of tidal land reclamation in Korea, We can find the first case of it in 13th century KangHwaDo(Island), and also find several records of small scale reclamations of western sea-coast from Korea dynasty to Chosun dynasty. A lot of wide fertile agricultural areas on western sea-coast have been developed through tidal land reclamation for about 1000-year after Korea dynasty. and on these areas, we have produced rice which we live on. An average areas of farming land per capital in korea is only 0.04ha, which is one sixth of global average. For water resources, similarly, capacity of water resources alloted to one person is $11{\%}$ of global average. So, without supplementary water development, we will have suffered from a severe deficiency of water Therefore we must prepare for these predictable short water and food problems. and tidal land reclamation may be suitable alternative to settle these problems. However, tidal land reclamation is a work of closing estuary, intercepting sea water inflow, developing a freshened estuary lake and farming lands etc. therefore it apparently causes a change of ecosystem, water quality and littoral environment. Nowadays, widely recognized the importance of environmental preservation, it is desirable or requested to make phil-environmental and sustainable development minimizing the environmental influence due to tidal land reclamation project. In this paper, the role of tidal land reclamation project in the development process of Korean agriculture was reviewed and the direction of afterwards tidal land reclamation project was suggested.

• 한국습지학회지
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• 제10권1호
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• pp.49-57
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• 2008

연안습지로 분류되는 갯벌은 육상과 해양을 연결하는 주요 전이대로서 다양하고도 고유한 생물상을 포함하면서 필수적인 생태적 기능을 수행하고 있다. 우리 인간을 포함하여 주변의 생물들이 누려왔던 갯벌의 생태계서비스 기능과 그것의 긍정적 효과를 유지 또는 강화하기 위해서는 갯벌의 보전이 매우 중요하나 국내의 경우 지금까지 보존보다는 개발이 우세하게 진행되어 왔다. 따라서 본 연구에서는 갯벌매립으로 인한 환경영향을 최소화할 수 있도록 해안개발사업으로 인한 갯벌훼손의 사례를 유형별로 분석하여 이를 토대로 저감방안을 수립하고자 하였다. 지금까지 해안개발사업을 추진하면서 입지선정단계에서 사업대상지가 갯벌로 구성되어 있다는 사실을 중요한 고려사항으로 인식하지 못하여 왔다. 이에 따라 1960년대 이래 우리나라 갯벌 면적의 거의 절반에 해당하는 갯벌이 매립되었고, 개발로 인해 주변 갯벌은 직 간접적으로 훼손되었으며, 모든 계획을 수립한 이후 환경영향평가의 협의단계에서 문제점이 지적되어 사업이 원래의 계획과는 다르게 수정해야 하는 경우도 나타나게 되었다. 이러한 문제점을 해결하기 위해서는 사업을 계획하는 초기단계에서 갯벌 환경에 대한 고려가 우선적으로 이루어져야 한다. 특히 입지선정단계에서 해양환경이 양호하여 다양한 생태계 기능을 수행하는 갯벌 (펄갯벌 및 모래갯벌)을 포함하여 암반 조간대, 사빈, 조하대 잘피숲 및 해중림 지역은 배제하도록 하여야 할 것이다.

• 한국환경과학회지
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• 제10권5호
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• pp.315-321
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• 2001

This study was conducted to estimate the decomposition capacity for organic matter by microbe of tidal flat sediments (Hajae, Dongjin and Mankyung). The decomposition rate constants (K') have been determined by Thomas slope method and compared with the values of each tidal flats. The decomposition rates of organic matter by microbe were initially very slow, but at the end of 12 hours, very sharply increased. The values of decomposition rate constant for Dongjin, Mankyung and Hajae tidal flat sediment were 1.364$day^{-1}$/, 1.080d$day^{-1}$ and 0.735$day^{-1}$, respectively. The decomposition rate constant of Dongjin tidal flat sediment which affected by livestock wastewater was higher than others. The decomposition quantity (mg/g/day) of organic matter by microbe of tidal flat sediments was 0.4mg/g/day for Dongjin, 0.36mg/g/day for Mankyung and 0.36mg/g/day for Hajae. The average of decomposition quantity was 0.37mg/g/day. To calculate purification capacity (kg/ha) of organic matter by microbe, we applied to two assumption ; 1) biological action by microbe is occur within 0.1cm under surface 2) specific gravity of sediment are 2.5g/$\textrm{cm}^2$. The purification capacity of organic matter by microbe of tidal flat sediment was calculated to 9.25kg/ha. The relationships between decomposition rate constant (K') and ignition loss (I. L), chemical oxygen demand by sediment (CO $D_{sed}$), total carbon(TC), silt and clay as index of organic matter were a high positive($R^2$=0.97~1.00).

• 대기
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• 제27권4호
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• pp.399-409
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• 2017

The impact of land cover changed by tidal flats on local meteorology in Gyeonggi Bay was quantitatively evaluated based on a numerical modeling approach during 18 days (21 June to 9 July 2013). The analysis was carried out using three sets of simulation scenarios and the land cover of tidal flats for each simulation was applied as follows: (1) the herbaceous wetland representing coastal wetlands (i.e., EXP-BASE case), (2) the barren or sparsely vegetated representing low tide (i.e., EXP-LOW case), (3) the water bodies representing high tide (i.e., EXP-HIGH case). The area of tidal flats was calculated as about $552km^2$ (the ratio of 4.7% for analysis domain). During the daytime, the change (e.g. wetlands to water) of land cover flooded by high tide indicated the decrease of temperature (average $3.3^{\circ}C$) and the increase of humidity (average 13%) and wind speed (maximum $2.9m\;s^{-1}$). The changes (e.g. wetlands to barren or sparsely vegetated) of land cover induced by low tide were smaller than those by high tide. On the other hands, the effects of changed land cover at night were not apparent both high tide and low tide. Also, during the high tide, the meteorological change in tidal flats affected the metropolitan area (about 40 km from the tidal flat).

• 한국해안해양공학회지
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• 제16권3호
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• pp.152-161
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• 2004

우리나라 연안 조위자료의 확률밀도함수 형태로 쌍봉형 정규분포 함수 형태를 제안하였다. 빈도분포 해석은 국립해양조사원에서 제공하는 인천, 군산, 목포, 제주, 여수, 마산, 가덕도, 부산, 포항, 속초 검조소의 1시간 간격 조위자료를 사용하였다. RMS 오차 및 결정계수($R^2$) 값을 비교ㆍ분석한 결과, 조위자료의 확률밀도함수로 본 연구에서 제안한 쌍봉형 함수가 기존에 사용하던 정규분포형 함수보다 더 적합한 함수로 파악되었다. 본 연구에서 제안된 함수의 매개변수는 Newton 방법을 수정한 Levenberg-Marquardt 방법으로 추정하였으며, 추정된 매개변수는 분석지점 검조소 자료의 비조화 상수와 밀접한 관계가 있는 것으로 파악되었다.

• 한국측량학회지
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• 제15권1호
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• pp.51-61
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• 1997

전지구 해양의 조석 분포를 파악하기 위해 $1/3^\circ$의 분해능을 갖는 2차원 수치모형을 수립하여 반일분조$(M_2,\;S_2,\;K_2,\;N_2)$ 및 일분조$(K_1,\;O_1,\;P_1,\;Q_1)$의 조석도를 작성하였다. 수립된 $1/3^\circ$ 수치모형은 기존 수치모형에서 낮은 분해능으로 인하여 평가하지 못하였던 천해역 및 육붕해에서의 조석현상을 평가하는데 적용되었다 작성된 조석도는 기존의 수치모형 및 위성 고도계 자료로부터 작성된 조석도와 또, 심해의 일부 지역에서 관측된 조화상수와 상호 비교하였다. 세격자망에 의해 계산된 전지구 해양의 조석도는 위성을 통해 관측된 순간 해면 자료로부터 조석성분을 제거하여 시간에 따라 변화하지 않는 해면변위를 산정하는데 있어 유용한 자료로 이용될 수 있다.

• 한국패류학회지
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• 제30권3호
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• pp.259-271
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• 2014

This study was conducted to investigate the impact of sand addition to an intertidal for the development of the Manila clam habitat on benthic community structure. For this, we focused on the spatio-temporal changes in the surface sediment condition and benthic community structure including Manila clam before and after the event. Study site was the lower part of Ojjeom tidal flat in Gonam-myeon, Taean-gun where sand added to on July 2010. We set three stations at each of sand adding area (experimental plot) and non sand-adding area (control plot) and did sampling works ten times from June 2010 to October 2011. Directly after the event, surface sediments changed to very coarse sand, but the state was not maintained over two months because of seasonal sedimentation and finally got back to the original grain sizes in eight months. The number of species and density were temporarily reduced right after the event and polychaetes such as Sternaspis scutata, Ampharete arctica were most negatively affected by the event. However, the number of species and density quickly recovered from the reduction in four to six weeks owing to the recolonization by the existing species and species in the vicinity of the plot. However, despite the recovery of ecological indies, species composition was continuously changed from one to another, thereby community structure stayed unstable condition, especially in some stations with finer sediment in their original condition. After sand addition, density of Manila clam was prominently increased at only one station with coarser sediment in its original condition.

• 대한토목학회논문집
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• 제32권6A호
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• pp.389-398
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• 2012

이 연구에서는 빠른 조류 환경에서의 재킷식 해양구조물인 울돌목 시험조류발전소 구조물에 대한 시공 중 및 운영 중 변형률을 장기 계측하여, 계측 자료를 다양하게 분석하였다. 우선 구조물 시공 단계별 변형률 응답의 변화를 분석하여, 양중, 블록재하, 파일 인발 및 근입 등의 작업 시 변형률에 큰 변화가 발생함을 제시하였다. 또한 재킷 레그 절단과 같은 구조변경 후의 고정하중 및 조류하중에 의한 변형률 변화를 분석하여, 조류하중보다는 고정하중에 의한 변형률의 변화가 크게 발생함을 확인하였으며, 운영 중 계측 결과로부터 주요 변동 주기 성분을 분석하여, 변형률 계측 자료에 M2 및 M4 조석 성분과 동일한 주기를 갖는 장주기 성분이 가장 크게 존재함을 확인하였다. 마지막으로 변형률 기반의 구조 건전성 모니터링에 있어 중요한 변형률 예측 모델을 신경망 기반으로 작성하여, 조류 유속 및 조위에 따른 변형률을 합리적인 수준에서 예측할 수 있음을 확인하였다.

• 한국수산과학회지
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• 제52권6호
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• pp.656-665
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• 2019

Environmental monitoring was conducted to identify the characteristics and patterns of sedimentary environments of tidal flats in 12 areas on the west coast of Korea. The habitat of the mud shrimp Upogebia major contained higher organic and mud contents compared to the habitat of the manila clam Ruditapes philippinarum. In particular, the mud content increased from 84.38% to 89.18% in the Seongam-4 area, where the mud shrimp and manila clam coexist, and the mean grain size exhibited a finer particle size, from 5.48 Φ to 5.80 Φ. In the mud shrimp habitat, the sediment mud content was > 60% and the mean grain size was > 5 Φ. Additionally, the mud shrimp only inhabited open coast tidal flat areas. The management of shellfish aquaculture farms by physical methods should be continued based on comparison of the sedimentary environments in the Boryeong and Seongam areas in response to the damage to the mud shrimp habitat.

• 농촌계획
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• 제8권1호
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• pp.3-14
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• 2002

Changes of chemical properties by times of the reclaimed tidal land soils and soil surface water, underground infiltration water with precipitation-runoff on natural meteological condition in the unripened tidal reclaimed paddy fields were investigated. This study was carried out to use environment-friendly farm land in the reclaimed tidal lands. The soils used in this study were saline-alkaline soils with the high $Na^+$ and $Mg^{++}$ content. As the results of investigation outflow loading of nutriments through outflow water in the unripened tidal reclaimed paddy fields by precipitation during the survey period, nutriments equivalent to T-N $1{\sim}2\;kg\;10a^{ -1}$ and T-P $0.01{\sim}0.02\;kg\;10a^{-1}$ from in the unripened tidal lands were discharged. Besides, the results of comparison losses of cation through outflow water showed $Na^+>\;K^+>\;Mg^{++}\;>\;Ca^{++}$, and the highest appeared water discharge of $Na^+$. In case of saemangeum reclaimed tidal land soils water discharge of cations showed $Ca^{++}$ 1.3 kg $10a^{-1}$, $Mg^{++}$ 1.6 kg $10a^{-1}$, $Na^+$ 17.7 kg $10a^{-1}$, and $K^+$ 3.2 kg $10a^{-1}$ respectively. On the other hand, in case of koheung reclaimed tidal lands soils water discharge of cations showed $Ca^{++}$ 18.1 kg $10a^{-1}$, $Mg^{++}$ 31.2 kg $10a^{-1}$, $Na^+$ 320.8 kg $10a^{-1}$ and $K^+$ 51.2 kg $10a^{-1}$ respectively.