随机波作用下伞式吸力锚基础局部冲刷演变分析

为了验证新型伞式吸力锚基础的防冲刷效果,本文利用Flow-3D软件建立三维海床-吸力锚-波浪相互作用模型,基于JONSWAP随机波浪谱,结合某海域风区资料模拟随机波,对随机波浪作用下伞式吸力锚基础(USAF)局部冲刷演变进行分析,试验土体为非黏性土.首先探讨了随机波浪作用下基础周围流场变化规律和冲刷演变模式,其次分析了...

Analysis of Local Scour Evolution of Umbrella Suction Anchor Foundation Under Random Waves

In order to verify the anti scour effect of the new Umbrella Suction Anchor Foundation,a wave-suction anchor-seabed interaction model was establishd by FLOW-3D.Based on the JONSWAP spectrum and the wind data of Yellow River Delta,the local scour characteristics of the umbrella suction anchor foundation(USAF)under random waves and non-cohesive soil were studied.First,the flow changes and the scour evolution around the anchor under random waves were discussed,and then the influence of the effective wave height and water depth on the local scour changes of the anchor were analyzed.The results show that the turbulence in the range of 0~3 m before the anchor and 6~12 m behind the anchor was intensified because of the presence of anchor,and its ability to transport soil particles was enhanced,which caused the local scour around the anchor.The anchor branches of USAF can reduce the soil erosion around the anchor and improve the stability.With the increase of the effective wave height,the erosion in front of the anchor(within 45°)was intensified,and the deposition range moved back.The change of water depth has a significant effect on the postpile vortex shedding.With the increase of the water depth,the post-pile vortex shedding was increased,which intensified sediment transport.