Space geodetic techniques can be used to obtain precise shape and rotation information of the Earth. To achieve this, the representative combination solution of each space geodetic technique has to be produced, and then those solutions need to be combined. In this study, the representative combination solution of very long baseline interferometry (VLBI), which is one of the space geodetic techniques, was produced, and the variations in the position coordinate of each station during 7 years were analyzed. Products from five analysis centers of the International VLBI Service for Geodesy and Astrometry (IVS) were used as the input data, and Bernese 5.0, which is the global navigation satellite system (GNSS) data processing software, was used. The analysis of the coordinate time series for the 43 VLBI stations indicated that the latitude component error was about 15.6 mm, the longitude component error was about 37.7 mm, and the height component error was about 30.9 mm, with respect to the reference frame, International Terrestrial Reference Frame 2008 (ITRF2008). The velocity vector of the 42 stations excluding the YEBES station showed a magnitude difference of 7.3 mm/yr (30.2%) and a direction difference of 13.8° (3.8%), with respect to ITRF2008. Among these, the 10 stations in Europe showed a magnitude difference of 7.8 mm/yr (30.3%) and a direction difference of 3.7° (1.0%), while the 14 stations in North America showed a magnitude difference of 2.7 mm/yr (15.8%) and a direction difference of 10.3° (2.9%).

홍수기 중 저수지 운영은 이수와 치수를 고려한 전반적인 홍수기 저수지 운영확 홍수예측시 임의의 저수지 수위에서의 홍수시 저수지 운영으로 구분할 수 있다. 본 연구는 홍수시 저수지운영에 관한 것으로 전반적인 홍수시 저수지 운영방안에 관해 논의하고자 한다. 현행의 홍수시 저수지 운영을 위해서는 확보된 홍수조절용량을 토대로 각종 수문모형의 불확실성과 기술적인 한계, 제약조건 등을 고려한 양적인 홍수조절 방안이 마련되어야 한다. '저수지 홍수변환법'은 이러한