摘要
本文根据江苏射阳河口—长江口淤长型淤泥质潮滩布设的19个测量断面连续10年(1980—1989年)的观测资料,对其潮滩的沉积特征和剖面的形成过程进行了研究分析,提出了影响这里潮滩剖面发育的主要因素有泥沙供应、风浪、潮流以及围垦等;而江苏淤长潮滩双凸形剖面形态的形成是由潮滩的两个沉积峰区所造成的,同时,风浪、供沙等季节性因素,潮汐变化周期性因素,围垦等人为因素也使潮滩剖面形态不断调整变化。
Analyzes of the characteristics of tidal flat deposition and sectional formation, based on 10 years (1980-1989年) continuous servey data of 19 sections on more than 550km deposi-tional tidal flat between the Sheyang River Mouth and the Changjiang River Estuary indicate the main factors affecting the sectional development of depositional tidal flat are silt supply, coastal conditions of tidal forces such as stormy waves and tidal current, and reclamation.1. The amount of depositional silt near the mean high and low (on the high side) tidal line are greater than in others.2.The sectional line of depositional tidal flat is in double convex shapes. The convex points are near mean high and low tidal line (on the high side), two convex areas correspond with two high depositional areas.3.The greater the silt supply and the faster the depositional speed, the more obvious the characteristics of double convex shape profile. When erosion of tidal flat increases, the cross section of the tidal flat changes toward a concave shape.4. During the period of half- month tide, when tide changes from spring one to neap one, the profile of upper tidal zone rises, and when tide changes from neap one to spring one, the sectional line of lower tidal zone rises.In February-September, the profile of tidal flat rises generally, but the lower tidal zone rises better than the upper tide zone. From September to February of next year, the lower tidal zone rises less than the upper tidal zone.5. Reclamation has changed the depositional process of the tidal flat in front of the bank, transforming profile shape of the tidal flat, and changing its slope from gentleness to steepness, and to gentleness again.
出处
《海洋与湖沼》
CAS
CSCD
北大核心
1991年第4期360-368,共9页
Oceanologia Et Limnologia Sinica
