CAJ | 학술논문

采用考虑河岸坍塌的三维水沙数值模型,对三峡工程运用初期石首河弯的河势演变进行了模拟分析.数值模型中采用基于非正交网格的局部网格可动技术,将传统水沙模型与二元结构河岸坍塌力学模型相结合.利用三峡水库蓄水前后2002～2004年石首河段冲淤演变资料对模型进行了验证,模拟结果与实测结果吻合较好;模型不仅能模拟出河道的垂向冲淤过程,而且还可模拟出由河岸坍塌所引起的河道横向摆动过程.计算分析了三峡工程运行至2016年末河段的河势演变情况,结果可为河段的河道整治提供参考.
채용고필하안담탑적삼유수사수치모형,대삼협공정운용초기석수하만적하세연변진행료모의분석.수치모형중채용기우비정교망격적국부망격가동기술,장전통수사모형여이원결구하안담탑역학모형상결합.이용삼협수고축수전후2002～2004년석수하단충어연변자료대모형진행료험증,모의결과여실측결과문합교호;모형불부능모의출하도적수향충어과정,이차환가모의출유하안담탑소인기적하도횡향파동과정.계산분석료삼협공정운행지2016년말하단적하세연변정황,결과가위하단적하도정치제공삼고.
A 3D mathematical modeling considering bank erosion is adopted to simulate the fluvial processes of the Shishou bend in the Middle Yangtze River during the early filling of the Three Gorges Reservoir. The locally-adaptive grid system based on non-orthogonal grids is used to calculate the lateral migration in channels due to bank erosion with a composite structure. The observed data of bed deformation from September 2002 to July 2004 is adopted to verify the accuracy of the model, and the calculated results agree well with the measured data. The 3D model can not only simulate the longitudinal bed deformation, but also calculate the lateral migration in alluvial rivers. The fluvial processes in the Shishou bend from July 2004 to December 2016 are forecasted using the 3D model after the filling of the Three Gorges Reservoir, and the calculated results can provide scientific basis for the investigation of river regulation.