SEDIMENTARY ENVIRONMENT AND EROSION-DEPOSITIONAL PATTERN OF THE OUTER CHANNEL OF LIANYUNGANG PORT
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摘要: 1855年黄河回归渤海,苏北沿岸陆源供沙基本断绝,连云港外航道海域逐渐成为冲刷性滨海环境。通过环境演化、地形地貌和波、流、沙等环境要素分析认为,1855年黄河供沙断绝后,在波-流联合作用下,研究区总体呈现冲刷态势;水体含沙量0.43 kg/m3可作为冲淤转换的判据。1973年以来的港口建设期间,研究区受工程弃土影响而表现为淤积,但这是人工所致,工程结束后或工程间隙期逐渐被冲刷夷平。人为引起的淤积不能取代自然作用引起的冲刷,这一冲刷特征对连云港正在开展的徐圩港区建设和30万t级航道疏浚工程是有利的。Abstract: The sand supply to Jiangsu coast was cut off after Yellow River shifted to north into the Bohai Bay in 1885, and then the outer channel of Lianyungang turned to an erosional environment. This paper is devoted to the evolution of erosion-deposition pattern of the area based on studies of changes in environment, topography, wave, coastal current, sand input and other environmental elements. It is found that 0.43kg/m3 of sediment supply is the lowest limit to profect the coast from erosion. Since 1973, the area has become depositional due to the input of large amount of the abandoned soil and sand from the harbor construction. However, the deposition is induced by human activities. It will be replaced by erosion as soon as the project ends. The erosional manner is beneficial to the Xuwei port and the ongoing dredging project for the 30 DWT channel at Lianyungang.
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Key words:
- the outer channel /
- environment evolution /
- deposition-erosion pattern /
- Lianyungang port
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