거금수로 주변 해역의 해수유동

추효상 전남대학교 수산과학연구소 1995 수산과학연구소논문집 Vol.4 No.-

KuglUTI Suro C뼈미lel is located at south-westem c얘st in Korea. The wichh of the channel is about 3 Km ar띠 the average depth is about 15m. In the channel Pungnarn-ri aI1d G값Iwa-ri are situated on Gohung disπic to north-east of 야1e channe1, in which the laver aI1d sellfish fam피19 have been well developed. It has been well known that the flows in Kugum Suro channel 뼈 뼈si떼ly dominated by ti없1 currents. 까mt is, in flα찌 current the water flows north aI1d then west, but in ebb current it flows 않st and then south. Studying the characteristics of tlow patterns on the various tidal conditions in Kugum Suro chaI1nel, nurnerical experiments were 때Tied out. This paper discribes the ti없1 currents by 뼈ng the nurnerical m여el of two-dimmensional depth intergrated type. 까1e T얹ults of numerical experiments show that the flow pa뼈115 of spring aI1d n혀P tides are nearly similar. But current speed in neap tide is two-thirds of that in spring tide. on the coastal waters from Pungnarn-ri to Gal1wa-ri the current directions are almost 뼈rallel to the c얘st. 깐1<: Clπrent s'야빼s around Pungnam-ri coastal 따않s are small. But the current S야eili‘ 띠 the other coastal areas between Pungnarn꺼 aI1d G삶lwa-ri are 1따ge to some extent.

남해 평산포 주변해역의 조석 및 조류 특성

추효상 전남대학교 수산과학연구소 2017 수산과학연구소논문집 Vol.25 No.-

In order to estimate the tide and tidal currents around Pyonsan-po which located in southwest Namhae island in the south sea of Korea, tide and tidal mooring currents observations and cruise surveys by Acoustic Doppler Current Profiler were carried out. Semi-diurnal tides are dominant and their factors are 0.215 in Pyongsan-po. The mean sea level in Pyongsan-po during the observational period is similar to near Yeosu port and Hangchon around Namhae island and its value is 167.6cm. Currents flow east at flood tide and flow west at ebb tide in Pyongsan-po. The ebb flows stronger than the flood and the tidal residual currents flow WNW 2~5cm/s speed. Currents by ADCP in the Yeosu Haeman Channel around Pyongsan-po flow NNW~NNE 28~67cm/s speed at flood tide and SSE~SSW 24~65cm/s speed at ebb tide. The floods flow ENE from 1.5h after low water to 0.5h before high water on the basis of tides at Yeosu port and reach the maximum speed of 17cm/s at 2.0h before high water. The ebbs flow WNW from 1.0h before high water to 1.5h after low water and reach the maximum speed of 20cm/s at 2.5h before low water. Key words: Tide, Tidal current, Namhae Island, Yeosu Haeman Channel, ADCP

도암만 주변해역의 조석·조류 특성

추효상 전남대학교 수산과학연구소 2015 수산과학연구소논문집 Vol.23 No.-

In order to estimate the tide and the tidal currents around the Doam bay which located in the southwestern coast of Korea, tide and tidal currents observations were carried out at four stations in spring tide. Semi-diurnal tides are dominant in the bay. The phase lag of M2 tide is faster at the east of the bay than at the south of the bay. The tidal range is lowest at the middle of the bay. The flows at the middle of the bay show the rotational form but the reversing type at the others around the bay. The currents flow NW in flood tide and S~SE in ebb tide at the middle of the bay. The direction of the tide-induced residual currents is SE at the east and the south of the bay, while the tide-induced residual currents flow SW at the middle and the west of the bay. The currents of the bay are influenced by the southward flows from the north and the eastward flows into the Mado-sudo channel in ebb tide.

남해도 주변해역의 조석 및 조류특성

추효상 전남대학교 수산과학연구소 2007 수산과학연구소논문집 Vol.16 No.-

In order to estimate the tide and tidal current around Namhae Island in the South sea of Korea, tide and tidal current observations were carried out at five observational stations at the same time. Tides were measured at TD-1, TD-2 and TD-3 station which represent Kwangyang Bay, Noryang Strait and JinJu Bay around Namhae Island for about one month. We also moored current measuring systems at CR-1 ~ CR-5 station simultaneously to determine the change of tidal currents at the surrounding of Namhae Island in spring and neap tide. Semi-diurnal tides are dominant and their factors are 0.220~0.244 around Namhae Island. The phase of M2 tidal constituent is early first at Yeosu harbor and second at the Northern part of Kwangyang Bay(ST.TD-1) and last in Noryang Strait (ST.TD-2). Semi-diurnal tidal currents are dominant at CR-1~CR-4 but at CR-4, tidal currents are appeared as mixed currents( the tidal current factor is 0.70). Currents flow east at flood tide and flow west at ebb tide in Noryang Strait. The ebb flows stronger than the flood in the upper layer of Noryang Strait. However in the mid-layer of Noryang Strait the flood flows stronger than the ebb. The maximum speed of tidal current in Noryang Strait is 105.8cm/s at ebb during the period of the observation.

가막만 남쪽 화태도 주변의 해황 특성

추효상 전남대학교 수산과학연구소 1998 수산과학연구소논문집 Vol.7 No.-

Temperature, salinity, transparenc:y. tide and tidal currents observations were carried out around Hwatae Is. in the south of Kamak Bay, southern coast of Korea in Februay, April, July and October 1994. Temperature showes its mllllmurn value of 6~9 "C in February and rnaximum value of 18-~23 'C in July. A weak stratification was formed in July, but the water in the study area was homogeneous in February, There are two differnt water mass around Hwatae ls.. One located at the southeast in the study area has the characteristic of oceanic water, the other at the northwest has that of the water of Kamak bay. Salinity was its lowest 32.5~ in October, its highest 34.0~ in April‘ Tidal form number estimated from the rate of the amplitude for diurnal tide to semidlUrnal tide is 0.23, then the semi-diurnal tide is dominant around Hwatae ls.. Semi-diurnal components of tidal currents f10w WNW in f100d tide, ESE in neap tide.

신지도 동쪽 주변해역의 조위변동과 수온의 변화

추효상 전남대학교 수산과학연구소 1996 수산과학연구소논문집 Vol.5 No.-

Sea level changes and sea surface and 5 meter temperatures were observed in the east (station S-1) and the north (station S-2) of Sinji Island during 25 hours from 4 February to 5 Februarγ 1994. Tides at tw。 stations showed a feature of the mixed tide in which both semi-diurnal and diurnal tide were concurrently existed but the semi-diurnal tide was dominant. Amplitude of the tide at station S-1 was two times as high as that at station S-2. It suggests that the tide of the eastern part of Sinji island has the feature of the tide in South Sea of Korea and that of the northern part showes the feature of the tide in shallow waters. Sea level changes in the north of Sinji island were similar with those in Wando Harbour. Water temperatures at station S-1 were higher than at station S-2. Water temperatures 더sed and fell in accordance with the semi-diurnal tidal period dominant in the eastern and northern parts of Sinji island.

신지도 동쪽 주변 해역의 계절별 수온, 염분 특성

추효상 전남대학교 수산과학연구소 1996 수산과학연구소논문집 Vol.5 No.-

For the study of basic oceanographic condition in the Eastem coastal area of Sinji Island, temperature and salinity were observered in Februalγ, Ap끼1 , JlIly and October 1994. The reslllts are as follows; Water temperatllre distriblltes 9.0~ 14.0'C and high at the eastem part and low at the westem part of the stlldy area in winter. 까피S shows that cold water masses are developed in the northwest of Sinji Island by means of the surface cooling in winter sea'ion. on the other hand, in S lImmer, water temperature rises at the westem part near Jangjic Channel and decrease at the sOllthem part of the stlldy area deserving the southem sea of Korea. Surface sa1inity is low near Jangjic Channel and the coast of Sinji Island under the influence of fresh water all the year round. But owing to the south sea of Korea, the southem and eastem part of the study area have comparatively high salinity. 10 meters and bottom salinities are nearly homogeneous in all areas, which is considered as the effect of strong tidal currents existing in the study area.

수중 투명도와 부유 현탁물량의 관계

추효상 전남대학교 수산과학연구소 1995 수산과학연구소논문집 Vol.4 No.-

In waters, the sun light is absorbed and scattered by suspendid solids, which takes 35 per'∞nt of the light 야am attenuation coefficient. 끼le relation~hip between π떠1Sparensy and suspendid solids was studied from the view point of optical properti않. It was found that transparency R and light beam attenuation c∞fficient C were able to be connected with the equation RC:::c:4.0‘ The observation'i of 때l.'iparency and sll~pendid solids are carried out in A<;an Lake where has no remarkable f1ows. πle observational results are as fol1ows; The inα않se of sll~pendid solids resulted in the reduction of trans뼈rency. And the light beam attenuation coefficient computed from RC :::c:4.0 was deα없sed as the suspendid solids rose. The average gradient of the suspendid solids and the li밍lt beam attenuation coefficient to the dεpth'i of stations was -6.7mgr1m-1 and -2.αn( 까le equation C:::c:0.48 SS wa'i induced from the observational results. 까Ie changes of wind speed and c10ud amount inf1uence the trans뼈rency of waters, i.e. the increases of wind speed and c10ud anIOunt lead to the rise of πans맹rency. α1 the condition of the same anIOunts of sus야n예d solids, the observations in A잃n Lake did not show the change of transparency because there were low speed of wind and 1따ge amounts of c10ud at the tirrε of the observation of august 16, 1993.

수치모델에 의한 가막만 남쪽 화태도 주변의 해수 유동 특성

추효상 여수대학교 1998 論文集 Vol.12 No.2

There are lots of islands around Hwatae Is. in the south of Kamak Bay, southern coast of Korea. Also it has been well known that the flows around Hwatae Is. are basically dominated by tidal currents. Studying the characteristics of flow patterns on the various tidal conditions around Hwatae Is., numerical experiments were carried out. This paper discrives the tidal currents by using the numericla model of two-dimmensional depth intergrated type. The results of numerical experiments are as follows : In flood current, generally the waters originated from the oceanic southern waters of Korea flow between Kumsong-ri in Dolsando Is. and Taehaenggando Is., then it goes through the southern part of Songdo Is. along the channel of the northeast of Hwatae Is.. A cyclonic eddy is formed between Songdo Is. and Hwatae Is. because of the coastal topography. In ebb current, the waters from the northern Kamak Bay flow along two passages, i,e. between Songdo Is. and Hwatae Is. and between Chabondo Is. and Kaedo Is.. A cyclonic eddy shown in flood current between Songdo Is. and Hwatae Is disappears.

다층 진단 모델에 의한 광양만의 잔차류 수치 실험

추효상,이병걸,이규형 한국환경과학회 2002 한국환경과학회지 Vol.11 No.1

In order to estimate the quantitative roles of the tide induced residual currents, densisy currents and wind driven currents on the residual currents in Kwangynag Bay Korea, numerical experiments with a diagnostic multi-level model were carried out. Density currents were calculated from the temperature and salinity data observed in January, May, August and November 1998. Anti-clockwise circulations are formed at the western inner part of the bay, the location from the east of Myodo Is. to the south of POSCO Co. and the place between Yeosu peninsula and Namhae Is. from the calculation results of the tide induced residual currents. Velocities of the density currents are less than 3㎝/s at the western inner part of the bay and about 5㎝/s at the southern entrance of the bay. Density currents get strong in summer and weak in autumn. Wind driven currents at the surface layer flow in the directions of the given winds which are the daily mean winds when the temperature and salinity observations are carried out. In the middle and lower layers, however the wind driven currents flow in the opposite direction to the surface currents as supplementary currents. The surface wind driven currents are greater than the tide induced residual currents or the density currents. The calculated residual currents including the tide induced residual currents, density currents and wind driven currents agree with the results of the current observations approximately. In the Bay, the wind driven currents affect on the residual currents greatestly and tide induced residual currents and density currents do in the second place and the third place.