浙江椒江山溪性强潮河口的若干特征

本文从椒江河口的径流、潮流变化,泥沙运移和沉积结构以及河床演变和河口的发育过程探讨了山溪性强潮河口若干特征。

SOME CHARACTERISTICS OF THE JIAO JIANG MOUNTAIN RIVER ESTUARY UNDER STRONG TIDES IN ZHEJIANG PROVINCE

This paper discusses estuarine changes from the runoff with tide and the sediment transportation with sediment deposition and fluvial process with estua-rine growth. Thus the coutents of this paper may be summarized as follows.1. The growth of the Jiaojiang Estuary consists of1)The sea-water transgression in the Holocean Epoch and enlargement of the river bay.2)The sea-water regression in the Holocean Epoch and relative stability of the river bay.3)Silting of the bay and the human interferences.2. The characteristics of the hydrodynamic action indicate that.1) The flow is usually dictated by the tides in the lower reach of the river.2) The flow of the flood period is dictated by runoff concentration in the reaches above Haimen,3. The sediment transportation with sediment deposition indicates that1) Above Haiman of the estuary the deposition along the river bed is of gravels and medium-sized sands with fine sands from the upstream watershed.2) The deposition of the Taizhuwan Bay is of very fine sands that transported down stream mixed with fine materials outside the river mouth and moving with the tides,4. The basic characteristics of the fluvial processes in the estuary may be described as fallows.1) The morphology and deposition of the river bed above Shuilongshan have the characteristics of mountain river, but have tidal stratification in the dry season tide current.2) From Shuilougshan to Haimen the characteristics show the mutual influence of the mountain river and the tides, the deposition has sand, silt and clay.3) The Taizhuwan Bay below Haimen is developed with non-model river mouth bar.