The three-dimensional eco-hydrodynamic model was applied to estimate the physical process in terms of COD (chemical oxygen demand) and net supply(or decomposition) rate of COD in Kamak Bay to find proper management plan for oxygen demanding organic matters. The estimation results of the physical process in terms of COD showed that transportation of COD is dominant in surface level while accumulation of COD is dominant in bottom level. In the case of surface level, the net supply rate of COD was 0～0.50 mg/m2/day. The net decomposition rate of COD was 0～0.04 mg/m2/day in middle level(3～6m) and 0.05～0.15 mg/m2/day in bottom level(6m～bottom). These results indicates that the biological decomposition and physical accumulation of COD are occurred predominantly at the northern part of bottom level. Therefore, it is important to consider both allochthonous and autochthonous oxygen demanding organic matters in the region.

산지계류수에서의 T-N(총질소), T-P(총인) 및 COD(화학적산소요구량)의 농도와 유출부하의 변화를 파악하고 산림의 수질정화기능을 평가하였다. 충청북도에 있는 시험유역은 면적이 92.5 ha이며 59%의 혼효림과 30%의 침엽수림으로 구성되어 있다. 시험유역의 말단에서 평상시는 10일 간격으로 또한, 1개의 강우사상에 대하여 2-6 시간 간격으로 계류수의 유량과 농도를 1년간 측정하였다. 강우시의 평균농도는 COD만이 유의적인 수준(p<0.05)에서

Determining factors and temporal & spatial characteristics of COD(Chemical Oxygen Demand) at the sea surface in Jinhae bay have been examined by using seasonal data, taken at twenty six stations cver the whole bay during 1989∼1994 by NFRDA. The data have been analyzed in terms of long term means, anomalously large values. Jinhae bay is divided into three regions based on the time mean : mouth of Jinhae bay, inner sea of Masan bay, western sea of Jinhae bay called region 1,2 and 3, respectively. The horizontal distribution of the long term mean of COD at each station is similar to those of nitrogen and phosphorus. Characteristics of whole mean variation in the year shows high range of variation in region 2. It was appear to decreases every year in whole trend. Factors determining seasonal variation in whole COD mean are relative to salinity and nutrient, affected by precipitation in summer. Spatial variation shows high range of fluctuation in region 2 compare to other region. Factors determining of spatial variation of COD was appear to nutrient, affected by pollutant load of land area and bottom sediment. The long term mean of COD at each station is closely related with thats of nutrients. The coorelation coefficient between COD and nitrogen, phosphate phosphorus was found to be high as 0.75, 0.78, respectively. Anomalously large COD was observed 14 times at 6 stations. These stations are located in inner sea of Masan bay(Region 2) and Songjeong bay(Region 1). The seasonal frequency of the observed anomalous COD is large in April, and other seasons are much the same.

A total of 24 surface sediment samples collected from coastal region and fronting of sea cliff on Cape Cod in southeastern Massachusetts, were analyzed to investigate the sediment transport mechanism. According to the result of grain-size analysis, the overall trend of grain size decreases from the north(Wood End Beach) to the south(Nauset Light Beach). The coarser materials tend to be deposited at the foreshore than at the backshore. Especially gravel content(%) is very high in northern beaches. The gravel fraction tended to concentrate at the toe of the beach. In addition to gravel, the beach and nearshore bar also tended to be deposite of very coarse sand and the finer fraction accumulate in the offshore bar. Grain-size analyses of sediment indicates that the coarsest sands including gravel accumulate in the beach and nearshore bar, the finer fraction winnowed out by wave action to be deposited in the offshore bar. The beach and nearshore bar sands and gravel are subsequently transported laterally by the wave-driven longshore drift, and finally they come to rest in the distal end of Provincetown Hook. The finer offshore sands are trnasported laterally to the south by net southward-directed longshore current.