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本文以浙东海岸地区水文、泥沙多次调查和各种文献资料为依据，通过对陆域、海域和空域泥沙的平衡计算，揭示了落淤浙东海岸地区的泥沙主要来自长江，它约占总来沙量的９１％，海域和当地河流来沙属同一量级，合占９％，空域来沙不足１ｔ。随之，也进一步论证了长江年输沙量约３０％南下浙江近海，这一观点是可信的。通过潮汐、波浪造滩过程分析，阐明了具有驻波性质的潮流作用于滩面时，造成涨潮流的减速时段长于加速时段，从而使浙东港湾淤泥质海岸在泥沙来源少的条件下仍能缓慢淤涨；开敞性海岸同受潮汐和波浪作用，波浪能在坡缓的淤泥质滩涂造成数公里宽的破碎带，使泥沙不断地来回搬运，海岸呈不平衡态，但因波浪作用时间比潮汐短，泥沙来源丰沛，故多呈淤涨势态。
Based on the multiple surveys of hydrology and sediment in the east coast of Zhejiang Province and various documents and data, the paper calculates the balance of sediment in the land, sea and airspace, revealing that the sediment mainly from the Yangtze River, It accounts for about 91% of the total sediment, the sea and the local rivers to the sand is the same magnitude, together accounted for 9% of the airspace to sand less than 1t. Subsequently, it is further demonstrated that the annual sediment transport in the Yangtze River about 30% of the south coast of Zhejiang offshore, this view is credible. Based on the analysis of tidal and wave beach-making processes, it is clarified that when the tidal current with the standing wave acts on the beach surface, the deceleration period of the rising tide current is longer than the acceleration period, so that the silt coast of the eastern Zhejiang Harbor is still under the condition of little sediment source Can slowly rise; open shore with the tidal and wave action, the waves in the sloppy muddy beaches caused by a few kilometers wide broken belt, so that sediment is constantly moving back and forth, the coast was unbalanced, but the waves The role of time shorter than the tidal, abundant sediment sources, it is mostly silting up posture.