| Title |
A Basic Study of Stage-discharge Rating Stabilization at the Ssang-chi Gauging Station |
| Keywords |
stage-discharge rating curve;shift analysis;rod float method;수위-유량관계곡선;전이분석;봉부자법 |
| Abstract |
On the SSang-chi gauging station, the discharge had been measured by the rod float method for the past twelve years. However the shifts of the rating curves are too big to be accepted. The major factors of rating curve variation were reviewed for shift analysis. To estimate the discharge measured by rod float method, two cross sections and their stages are generally required. But, the rating curves had been derived only with the observed depth of gauging station since the cross sections were not available. To correct the errors, the reference rating curve was developed. In this study, the water surface slopes of the curve were simulated by RMA2 model. The historical rating curves were re-developed by the calculated discharges on the base of the water surfaces. The results show that the range of fluctuation decreased and rating curves in recent years are physically reasonable. |