http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
강우시 하천과 호수에서 침강성 부유토사와 비침강성 부유토사의 비교
엄재성 ( Jae Sung Eum ),장성민 ( Sung Min Jung ),최영순 ( Yong Soon Choi ),이형진 ( Hyung Jin Lee ),최중대 ( Joong Dae Choi ),김범철 ( Bom Chul Kim ) 한국물환경학회 2012 한국물환경학회지 Vol.28 No.2
Total suspended solids (TSS), settleable suspended solids (SSS) and nonsettleable suspended solids (NSSS) were compared in streams and lakes during rain events. Samples were collected in Lake Soyang and nine agricultural streams during storm events over two years. To measure NSSS, samples were settled in 1 L cylinders for one hour and then 50% of the total sample volume was taken from the center of the cylinder. The SSS/TSS ratio in streams (0.50) was higher than in Lake Soyang (0.20). The ratio of TSS to turbidity decreased from 1.21 in the inflowing river to 0.69 in the reservoir outlet. Turbidity and NSSS showed higher correlation (r2=0.82) compared with the correlation between turbidity and TSS (r2=0.66). Median particle size decreased from 11.4 μm in the inflowing river to 4.2 μm in the lake outlet. The results indicate that only fine particles of less than 5~10 μm can be transported downstream of the lake. Because fast-flowing water in streams includes not only fine particles but also coarse particles, an overestimation of suspended sediment concentration results if only TSS is measured. Consequently, TSS and NSSS should be measured separately to evaluate the effect of suspend sediment loadings of turbid streams on aquatic habitat during the monsoon season.
강우시 한강유역에서의 비점오염원 유출 특성과 토지이용도와의 관계
정성민 ( Sung Min Jung ),엄재성 ( Jae Sung Eum ),장창원 ( Chang Won Jang ),최영순 ( Young Soon Choi ),김범철 ( Bom Chul Kim ) 한국물환경학회 2012 한국물환경학회지 Vol.28 No.2
Nonpoint source pollution has become a concern for water quality in the Han River system, especially during the high runoff events during the monsoon season. The patterns in nonpoint source runoff the relationships with land use, rainfall intensity, and stream nutrients concentrations were surveyed in 19 streams in the Han River watershed. The results show that the magnitude of NPS inputs of nutrients and sediment in the Han River watershed are of a serious concern. In the South Han River watershed, event mean concentrations (EMC) for biochemical oxygen demand (BOD), suspended sediment (SS), dissolved organic carbon (DOC), dissolved total phosphorus (DTP), total nitrogen (TN) Nitrate (NO3-N) and total phosphorus (TP) were 1.94 mg·L-1, 251mg·L-1, 2.75mg·L-1, 0.076mg·L-1, 2.82mg·L-1, 2.40mg·L-1 and 0.232mg·L-1, respectively. In the North Han River watershed, EMCs for BOD, SS, DOC, DTP, TN, NO3-N and TP were 1.34 mg·L-1, 172 mg·L-1, 2.63 mg·L-1, 0.032 mg·L-1, 1.97 mg·L-1, 1.55 mg·L-1 and 0.148 mg·L-1, respectively. The specific export coefficients of nutrient and sediments were much higher than those of other reports. Our study also found that the proportion of agricultural field area was significantly correlated with the EMCs for nutrients. Therefore, efforts to reduce NPS loading must focus on agricultural practices in the watershed. The relationships between land use and nutrient and sediment export found in this study can be used to derive estimates of runoff coefficients for agricultural field and as input data for modeling works and to develop total maximum daily load and best management practices in the Han River watershed.