CAJ | 학술논문

长江口深水航道整治工程位于长江口北槽，分三期完成。工程实施后，航道内每年均出现严重回淤现象，航道疏浚维护费用巨大。通过建立长江口深水航道二维数学模型，计算了1997、2001、2005、2009年4个不同时间段典型断面涨落潮流量，分析了长江口深水航道工程实施期间涨落潮流量的变化情况，探讨了航道回淤的原因。一期工程使航道中段落潮流量减小而上段落潮流量增加，二期工程后航道整体落潮流量减小，三期工程的实施减缓了航道落潮流量减小的趋势，而航道内落潮流量的减小可能是出现严重回淤的水动力原因。
장강구심수항도정치공정위우장강구북조，분삼기완성。공정실시후，항도내매년균출현엄중회어현상，항도소준유호비용거대。통과건립장강구심수항도이유수학모형，계산료1997、2001、2005、2009년4개불동시간단전형단면창락조류량，분석료장강구심수항도공정실시기간창락조류량적변화정황，탐토료항도회어적원인。일기공정사항도중단락조류량감소이상단락조류량증가，이기공정후항도정체락조류량감소，삼기공정적실시감완료항도락조류량감소적추세，이항도내락조류량적감소가능시출현엄중회어적수동력원인。
The renovation project of deepwater navigation channel at Yangtze estuary is located in the north channel and built in three phases .After construction of the project , the phenomenon of back silting is serious and the cost for dredging and maintaining is huge .With the establishment of 2D numerical model of deepwater navigation channel at Yangtze estuary ,the paper calculated the flux of different sec-tions in 1997 , 2001 , 2005 , 2009 , and analyzed the changes of flux during the construction of the pro-ject,and discussed the reason of back silting .The flow of ebb in the middle of the channel decreases while that in the upper increases after the construction of first phase .Besides, the flow of ebb decreases in the whole channel after the second phase project while the third phase project slows down the decrea -sing tendency .The decrease of ebb flow may be the hydrodynamic reason for back silting .