摘要
(一) 悬浮泥沙含量值根据计算统计结果,全区海水中悬浮泥沙含量甚低,平均含量为42.1g/m^3,以20—40g/m^3为主(占49.6%)。含量大于65g/m^3的为数甚少(占19.4%)。实测极高值(底层)为1462.5g/m^3,最大垂线平均值为502.9g/m^3(均见于122站,1980年10月15日10时)。各海区悬浮泥沙含量不等,具有含量分布的差异性,从整个海域看,含量值以九龙江河口湾与外港最高,西港次之,浔江最低(表5·8-1,图5·8-1)。
The suspended silt in sea water in Xiamen Harbour is low with an average of 42.1 grams Per cube metre of water.The highest abundance is in Jiulong River mouth and Out Port of Xiamen and the lowest in Xunjiang Bay.The main components are clay minerals with 54.8%of kaolinite and 33.7%of illte,fine grain of detrital mineral with quartz the first and feldspar the second in content,organic and non-crystal matters.Five types of gradual increase,gradual decrease,Positive convergence,negative convergence and unanimous type have been divided for the vertical distribution of content which increases upwards from lower strata generally.In the change of suspended silt concent in a diurual tidal cycle,the highest content occurs at a half tidal level when the current velocity is at the maximum or a half hour later in section of river-mouth and bay-mouth,and occurs before or after 30 to 60 minutes of low tide and a part of that occurs at half tide or an hour before high tide in inner bay and river-mouth areas.The high Peak values of contents generally decrease gradually from bay-mouth or river-mouth inwards,particularly in lower strata.The suspended silt enters in the north and exits from the south in mouth sections of Xunjiang Bay and Out Port of Xiamen,and the net output is higher than the net input.On the mouth section of Jiulong River,the suspended silt enters sea southeastwards along the coasts.A part of the silt turns backwards and enters inner mouth along the area south to Jiyu Islet.On the mouth section of Gulang Island-Songyu,input dominutes in the Songyu side and output dominates in both sides of Gulang Island.The direction of net transport is northeastward in culvert of Gaoqi-Jimei cause way.
出处
《台湾海峡》
CAS
1988年第1期84-90,共7页
Journal of Oceanography In Taiwan Strait
