CAJ | 학술논문

根据2012年9月在杭州湾口门中部外侧海域岱衢洋主槽内获得的包括大、中、小潮的垂向流速和悬浮泥沙观测资料，利用机制分解方法计算了岱衢洋的水沙输移通量等特征，分析并讨论了各个输沙项对总输沙量的贡献，解释了杭州湾水沙进出外海的输运机制。研究结果表明：研究区域单宽涨潮量大潮为小潮的2.3倍，单宽落潮量大潮为小潮的1.6倍。从小潮到大潮的余流和单宽净输水量由向海变为向陆；单宽涨潮输沙量大潮为小潮的4.5倍，单宽落潮输沙量大潮为小潮的2.7倍。单宽输沙量表现为小潮和中潮向海，大潮向陆的特点，大潮单宽净输沙量约为小潮和中潮的2倍；在各输沙项中，平流输沙主要来自水体净输移（拉格朗日余流决定）对悬沙输移的贡献，平流输沙方向小潮向海，中潮和大潮向陆，其中大潮和小潮时平流输沙在各项中贡献率最大；潮泵输沙小潮和中潮向海，大潮输沙向陆，中潮时潮泵输沙贡献率在各项中贡献率最大；垂向净环流输沙方向均向陆，大中小潮悬沙含量的垂向的差异是导致小潮垂向净环流输沙量大，大潮输沙量小的主要原因；杭州湾中部通过岱衢洋通道与外海泥沙交换的主要形式是大进大出、反复搬运，而在一个完整的半月周期内外海泥沙净进杭州湾的量相对较小。
근거2012년9월재항주만구문중부외측해역대구양주조내획득적포괄대、중、소조적수향류속화현부니사관측자료，이용궤제분해방법계산료대구양적수사수이통량등특정，분석병토론료각개수사항대총수사량적공헌，해석료항주만수사진출외해적수운궤제。연구결과표명：연구구역단관창조량대조위소조적2.3배，단관락조량대조위소조적1.6배。종소조도대조적여류화단관정수수량유향해변위향륙；단관창조수사량대조위소조적4.5배，단관락조수사량대조위소조적2.7배。단관수사량표현위소조화중조향해，대조향륙적특점，대조단관정수사량약위소조화중조적2배；재각수사항중，평류수사주요래자수체정수이（랍격랑일여류결정）대현사수이적공헌，평류수사방향소조향해，중조화대조향륙，기중대조화소조시평류수사재각항중공헌솔최대；조빙수사소조화중조향해，대조수사향륙，중조시조빙수사공헌솔재각항중공헌솔최대；수향정배류수사방향균향륙，대중소조현사함량적수향적차이시도치소조수향정배류수사량대，대조수사량소적주요원인；항주만중부통과대구양통도여외해니사교환적주요형식시대진대출、반복반운，이재일개완정적반월주기내외해니사정진항주만적량상대교소。
Based on the data of current velocity and suspended sediment concentration measured in the main channel of the Daiquyang Sea of the middle outlet of Hangzhou Bay from neap tide to spring tide in September 2012, the transport mechanism of water and suspended sediment is calculated by using the mechanism decomposition method, and the contribution of transport items to the total suspended sediment transport is analyzed. The results show that the flood discharge per unit width with the magnitude in spring tide is 2.3 times bigger than that in neap tide, and the ebb discharge per unit width with the magnitude in spring tide is 1.6 times bigger than that in neap tide. The direction of residual current velocity and the net water transport are changing from seaward to landward and from neap tide to spring tide. The ebb sediment discharge per unit width with the magnitude in spring tide is 4.5 times bigger than that in neap tide, and the flood sediment discharge per unit width with the magnitude in spring tide is 2.7 times bigger than that in neap tide. The direction of sediment transport per unit width is seaward in neap and moderate tide, and landward in spring tide. The sediment discharge per unit width with the magnitude in spring tide is 2 times bigger than that in neap and moderate tide. The direction of advection transport term is seaward in neap tide, and landward in moderate and spring tide, making the largest contribution among all the items in neap and spring tide. The direction of tidal pumping transport term is seaward in neap and moderate tide, and landward in spring tide, making the largest contribution among all the items in moderate tide. The net vertical circulation transport term is landward all the time. From neap to spring tide, the vertical difference of the suspended sediment is the reason why vertical circulation transport is lager in neap tide than that in spring tide.