莱州湾海域水文特征及冲淤变化分析

Analysis of Hydrographic Characteristics and Changes in Scour and Silting in the Laizhou Bay Area

研究了莱州湾海城水文、泥沙特征及沉积状况，分析了莱州湾海城不同等深线的冲淤变化，结果表明，莱州湾海城具有显著的大陆性气候特征，潮汐类型属于不正规混合半日潮，海岸泥沙主要来源于支脉河的径流和涨潮流携带来的海相泥沙；0m等深线1991-1993年是向海淤进，其余年段均为蚀退，蚀退速率与黄河口来沙量和口门入海位置有一定关系；两个断面上不同等深线的淤进（淤积）和蚀退（侵蚀）交替进行，0-2m等深线总体为蚀退（侵蚀）；大于2m等深线总体为淤进（淤积）；两个断面上坡度2-5m等深线之间最陡，随着水深加大，坡度逐渐变缓，不同年份趋势基本一致。

In this paper, the hydrographic and sediment characteristics and depositional conditions in the Laizhou Bay area are studied, and the changes in scour and silting at different isobths in the sea area are analyzed. It is shown from the study results that there are obvious continental climate characteristics over the Laizhou Bay area, the tide type in the sea area belongs to irregular mixed semi-diurnal tide, and the coastal sediments originate mainly from the sediments brought by the Zhimai River runoff and flood current the 0 m isobath prograded during 1991 to 1993, retrograded in other periods, and the retrogradation rate is related with the Yellow River mouth sediment discharge and the river outfall position the progradation and retrogradation at different isobths on 2 sections occurred alternately, the retrogradation occurred generally in the area shoreward of 2 m isobath, and the progradation occurred generally in the area seaward of 2 m isobath the slope between 2 m and 5 m isobaths on 2 sections is the steepest, and the slope gradually decreases with increasing water depth, this trends in different years are basically consistent with each other.