CAJ | 학술논문

利用2001-2008年的海图资料和2011-2012年枯季现场水文调查数据，分析长江口横沙东滩外侧海域的河势、水动力条件及泥沙含量的潮周期过程，讨论在此建设人工岛的自然条件。结果表明，横沙东滩外侧海域，2001-2008年间冲淤有变化，由滩向海的断面显示上部淤积，下部侵蚀，冲淤转换面在-7～-10 m 之间，-10～-20 m 海域整体呈现微冲趋势，但侵蚀速率减缓，河势趋于稳定。横沙东滩受北槽深水航道北导堤影响，向东南方向淤进。定点船测潮流表现出旋转流性质，枯季大潮最大流速不超过188 cm/s，小潮最大流速小于134 cm/s；北港口外的定点余流显示向口内输运，北槽口外则是向海输运。两测站数据显示枯季大小潮垂线平均含沙量处于0．061～0．116 kg/m3之间，水体泥沙含量整体处在较低水平。从自然条件上来说，不考虑风浪影响情况，研究区域内河势渐趋稳定，水深条件良好，水动力条件适宜，水体含沙量较低，在该区域内建设人工岛具有可行性。
이용2001-2008년적해도자료화2011-2012년고계현장수문조사수거，분석장강구횡사동탄외측해역적하세、수동력조건급니사함량적조주기과정，토론재차건설인공도적자연조건。결과표명，횡사동탄외측해역，2001-2008년간충어유변화，유탄향해적단면현시상부어적，하부침식，충어전환면재-7～-10 m 지간，-10～-20 m 해역정체정현미충추세，단침식속솔감완，하세추우은정。횡사동탄수북조심수항도북도제영향，향동남방향어진。정점선측조류표현출선전류성질，고계대조최대류속불초과188 cm/s，소조최대류속소우134 cm/s；북항구외적정점여류현시향구내수운，북조구외칙시향해수운。량측참수거현시고계대소조수선평균함사량처우0．061～0．116 kg/m3지간，수체니사함량정체처재교저수평。종자연조건상래설，불고필풍랑영향정황，연구구역내하세점추은정，수심조건량호，수동력조건괄의，수체함사량교저，재해구역내건설인공도구유가행성。
Shanghai harbor is to be built to an international shipping center,and needs deep-water harbor to meet the continuous increasing cargo transportation demands and larger vessels.Based on nautical charts during 2001 to 2008 and in-situ survey data obtained during 2011 to 2012,this paper discussed the feasibility of natural condition to build an artificial island outside the Changjiang Estuary.The results showed that the sea bed of the study area was stable,and its topography changed little from 2001 to 2008.Seven cross-section profiles showed that there was slight deposition in the upper part but erosion in the lower part,and the transforming depth from deposition to ero-sion was about -7 m to -10 m.The Hengsha East Shoal expands southeastwards due to the construction of north leading dike of the Changjiang Estuary deep-water navigation channel.The in-situ survey data showed that there was a rotary tidal current during the entire tide phase in winter,and the maximum current velocity was less than 188 cm/s during the flood of spring tide and no more than 134 cm/s during the ebb of neap.The residual cur-rent of the observation points showed some differences,e.g.,it was transported into the estuary outside of North Channel,and it was transported toward the sea outside of Northern Passage.The in-situ average suspended sedi-ment concentration was 0.061 kg/m3 to 0.116 kg/m3 ,corresponding to neap tide and spring tide,respectively. Based on analytical data provided above,we suggested that the hydrodynamic condition and the suspended concen-tration outside the Changjiang Estuary were suitable to build an artificial island,and weak local siltation could be expected due to rotary tidal current at the east edge of the Hengsha east shoal in the Changjiang Estuary.