• The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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• v.5 no.2
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• pp.105-118
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• 2000

Anchored measurements (12.5 hr) of suspended sediment concentration and other hydrodynamic parameters were carried out at two stations located at the entrance to Hampyung Bay in summer (August 1999). Tidal variations in water temperature and salinity were in the range of 26.0-27.9$^{\circ}C$ and 30.9-31.5, respectively, indicating exchange offshore and offshore water mass. Active tidal mixing processes at the entrance appear to destroy the otherwise vertical stratification in temperature and salinity in spite of strong solar heating in summer. On the contrary, suspended sediment concentrations show a marked stratification with increasing concentrations toward bottom layer. Clastic particles in suspended sediments consist mostly of very fine to fine silt (4-16 ${\mu}$m) with a poorly-sorted value of 14.7-25.9 ${\mu}$m. However, at slack time with less turbulent energy, flocs larger than 40 ${\mu}$m are formed by cohesion and inter-collision of particles, resulting in a higher settling velocity. Strong ebb-dominated and weak flood dominated tidal currents, in the southwestern and the northeastern part, respectively, result in a seaward residual flow of -10${\sim}$-20 cm $s^{-1}$ at station H1 and a bayward residual flow less than 5.0 cm $s^{-1}$ at station H2. However, mean concentration of suspended sediments at station H1 is higher at flood (95.0-144.1 mg $1^{-1}$) than in ebb (75.8-120.9 mg $1^{-1}$). On the contrary, at the station H2, the trend is reversed with higher concentration at the ebb (84.7-158.4 mg $1^{-1}$) than that at the flood (53.0-107.9 mg $1^{-1}$). As a result, seaward net suspended sediment fluxes ($f_{s}$) are calculated to be -1.7 ${\sim}$-$15.610^{3}$ kg $m^{-2}$ $s^{-1}$ through the whole water column. However, the stations H1 and H2 show definitely different values of the flux with higher ones in the former than in the latter. Alternatively, depth-integrated net suspended sediment loads ($\c{Q}_{s}$) for one tidal cycle are also toward the offshore with ranges of 0.37${\times}$$10^{3}$ kg $m^{-1}$ and 0.21${\times}$$10^{3}$ kg $m^{-1}$, at station H1 and H2, respectively. This seaward transport of suspended sediment in summer suggests that summer-time erosion in the Hampyung muddy tidal flats is a rather exceptional phenomenon compared to the general deposition reported for many other tidal flats on the west coast of Korea.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.37 no.6
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• pp.455-461
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• 2004

The morphological and histological changes of gonad in ridgetail prawn (Expalaemon carinicauda) were examined with the development of the external genitalia. The samples were collected monthly in Hampyung Bay on the western coast of Korea, from January to December 2003. The ovaries lie on the dorsal side of the female prawns thorax. The ovary cavity is located below the heart and above the hepatopancreas. The anterior part of the ovary is round and fused, and the posterior part has a pair of tubular structures. Testes are bilaterally symmetrical; the anterior part shows fused feature, and the posterior part consists of a pair of tubules. Based on histological examination, ripe eggs and spermatozoa were observed when mature females and males reach a length of about 14.9 and 11.5 mm CL, respectively. The immature female are almost same shape and structure with matured one in the endopod of first pleopod and appendix interna of the second pleopod, except the number of setae, and appear to be structurally complete after females reach a length of about 14.9 mm CL. The appendix masculina reaching beyond the distal end of the appendix interna of the second pleopod after males reach a length of more than 5.5 mm CL and a fully developed appendix masculina and appendix interna of the second pleopod appear up to a length of 11.5 mm CL.

• Korean Journal of Food Science and Technology
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• v.27 no.2
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• pp.185-192
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• 1995

Microbial and chemical changes of salt-fermented youbsak which is a traditional processed fish product only manufactured in Hampyung bay region were investigated in this study. Total microbial cells of salt-fermented youbsak was gradually increased up to 30 days fermentation and then it was decreased. The pH and total acidities of fermented youbsak were not greatly changed, except for a rapid decrease in pH and acidity after 15 days fermentation. Volatile basic nitrogen and amino-type nitrogen were rapidly increased until 30 days fermentation and then slightly decreased by adding the extracted soup of pig bones. Palmitic acid was the most abundant fatty acid, and the major free amino acids in salt-fermented youbsak were composed of leucine, tyrosine, glutamic acid, valine, isoleucine, alanine and methionine.

• Journal of the Korean association of regional geographers
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• v.13 no.2
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• pp.143-155
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• 2007

There are many conflicts or interests among various stakeholders on the development of the coastal area. The integrated methodology, which is reflective of physical conditions, socio-economic circumstances, and people's sense of values, is thus needed to solve the problems. In this study, geographical information systems(GIS) and analytic hierarchy process(AHP) that arc one of multi-criteria analysis methodologies are loosely coupled to develop better analytic procedures for coastal assessment. Socio-economic and environmental parameters of the study area, Hampyung Bay area, are converted to a GIS system-applicable format, while AHP is used to assess the relative importance level of each parameter by calculating weighting factors. After standardizing and rasterizing spatial data from various sources. the weighting factors are applied to produce the layers for each parameter. Map algebra and overlay analyses are used to create the final layer according to the decision making logic or model proposed here. Cell values of that layer could be considered as spatial alternatives. In addition to this finding, the flexibility with the weighing factors enable decision-makers to understand the procedures and alternatives in relevance with selective strategies for coastal management.