【作者】 王晓亮；

【导师】 张龙军；

【作者基本信息】 中国海洋大学 ， 海洋化学， 2005， 硕士

【摘要】 本课题来源于973“中国典型河口通量研究”。论文根据国内外对河口咸淡水混合区域水体中碱度、无机碳的研究现状,采用目前国际上公认的对海水无机碳测定的先进方法,于2003年9月、2004年4月、2004年9月在黄河口及其邻近海域设立站位,针对无机碳、碱度等参数在咸淡水混合过程中的变化特征,以及引起无机碳、碱度变化的各种因素进行了深入、系统的研究。得到的主要结果如下: 1、2004年春季TSS和盐度之间呈负相关关系,在河口0～15的低盐区,悬浮物含量随咸淡水混合迅速下降到200mg/L以下,变化比较剧烈;盐度大于15以后,悬浮物含量变化不大,基本维持在100～200mg/L之间。颗粒无机碳百分含量与TSS之间具有非常好的正相关关系,表明在河口区咸淡水混合的初始阶段,颗粒无机碳的变化与TSS的变化是同步的。碱度、溶解无机碳与盐度明显呈负相关关系,而且在小于5的低盐度区域,碱度和溶解无机碳明显“亏损”;而在盐度为8～20的中盐度区域,碱度和溶解无机碳却又表现出“盈余”。 2、大洪水期间:水体TSS分布总体趋势是底层最高,中层次之,表层最小,黄河口以南高浑浊度水体的外侧沉积梯度大。从河口向外海,水体中PIC%呈明显的递减趋势,且西高东低,南高北低。从河口向外海延伸方向上,表、中、底层水体的DIC分布呈现降低趋势,总体趋势是:淡水影响的区域表层>中层>底层。悬浮物含量与盐度之间呈负相关关系,PIC%与TSS之间呈良好的二次曲线关系:当TSS大于50～60mg/L时,PIC%降低;当TSS小于50～60mg/L时,PIC%略微增加。受黄河水量影响,在咸淡水混合过程中pH与盐度之间呈正相关。 3、小北干流调沙期间:在东经119.31°附近,存在一个低盐、低TSS的淡水区域:盐度小于10,TSS低于50mg/L,导致黄河口咸淡水混合过程中悬浮物含量与盐度之间呈正相关关系,即TSS随盐度增大而增大。由于受小北干流更多还原

【Abstract】 Based on the advanced method of studying inorganic carbon, we measured the chemical parameters in September, 2003, April, 2004 and September, 2004 in Huanghe estuary. The variation of IC, Alk in the fresh-sea water mixing process and its cause are the emphasises. The main conclusions are followed:1. In the Spring of 2004,the relationship between TSS and salinity is negative correlation. When salinity is 0~15‰, with the fresh-saltwater mixing, TSS decrease rapidlly to 200mg/L. But when salinity is above 15‰,TSS is 100~200mg/L.On the other hand, POC% increase with the increasing of TSS, this suggests that the variation about POC and TSS is synchronous in the begin phase of fresh-sea water mixing process.2. During the flood period, TSS decrease from bottom bed to surface layer.From estuary to main sea, PIC% decrease.But to DIC,the case is converse.The relationship between TSS and salinity is negative correlation,and between PIC% and TSS is quadratic curve:when TSS is more than 50~60mg/L PIC% decrease;when TSS is below 50~60mg/L, PIC% increase in a small degree.Because of the influence from Huanghe water,in the process of fresh-sea water mixing, pH increase with the increasing of salinity.3. During the period of xiaobei main flow moving-sand, there is a freshwater zonewith low salinity and low TSS near east longitude 119.31°. Here, salinity is below10%o, and TSS is below 50mg/L.This leads TSS increase with the increasing of salinity. Due to the sediment ejection of Xiaobei main flow, when TSS is below 100mg/L, PIC% decrease with the increasing of TSS concentration; But when TSS is above 100mg/L, there is almost no variation with PIC%.4. The non-conservative behavior of TAlk in Huanghe estuary: In April, 2004, when salinity is below 24%o, the behavior of TAlk is non-conservative. Due to theprecipition of DIC, TAlk is lower than the theory mixing TAlk. But when 8%o<S<24%o, TAlk is higher than the theory mixing TAlk .This must be caused by thedissolving of particle carbonate. And in our three investigation,the relationgship between TAlk and pCCh is secondary-functional .CO2 in water is a part in particle carbonate dissoving,and this is likely the dominant factor influencing the dissolving of carbonate.5. Transport flux of IC flow to the sea :In September,2003,flux of DIC in riverway is 0.14x106tC, flux of PIC in suspended matter is 0.66x1 O^CjIn April,2004,flux of DIC is 0.015x1 O^Qflux of PIC is 6.04x1 O^Cjand in September,2004, flux of DIC in riverway is 0.054x1 O^C^ux of IC in suspended matter is 0.4x10^, and IC dissolved by NH3.H2O is 2.61 xKRC, IC dissolved by NaOH is 5.26x103tC, IC dissolved by NH2OH is 2.65*1 O^C, IC dissolved by HC1 is 9.08x1 O^CTotal flux of PIC is 0.02 x106tC.更多还原