| 摘要: |
| 本文根据黄河口海域的特点,提出了一个新的模式描述沉积过程。将岩芯分成几个较大的部份,每一部份都代表一种沉积环境。在一种沉积环境中,输沙量虽有波动,但这种波动是有周期性的。在不同的周期中,可以认为。210Pb的沉积通量是恒定的。计算不同层段之间的沉积时间可以采用公式(公式略)。由于输沙量的周期性变化,沉积物的含水量也往往呈现有规律的周期性变化。文中求出了各岩芯含水量W与。210Pb含量之间的回归方程式,发现相关系数普遍较高。 |
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| SEDIMENT RATE IN AND NEAR THE HUANGHE RIVER DELTA BASIN |
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| Abstract: |
| The average load of Huanghe River is 12 hundred million tons a year, varying a factor of 9 between the flood and dry years. Maximum load occurs in July-October (more than 83% of the annual load), especially in August. Because of the very large load, the river bed is silted up so severely that Huanghe River Mouth often changes, bringing about also a change of sedimental environment of the basin, thus complicating the sedimentation process. The general approach to the sedimentation process problem will not fit. A new model to compute accurately the sediment rates of the basin is presented here. The rock core is cut into several parts. Each part of the core represents a sort of sedimental environment. In one sort of sedimental environment the fluctuation of load is periodic irrespective of fluctuation load. The precipitating fluxes of 210Pb are the same in different Periods. Therefore, the part of the core in one sort of sedimental environment is subdivided into several layers. Each layer represents a period. To compute the precipitating duration between the different layers the following formula is used:Because of periodic change of the load, water content in sediment has also a periodic change. The regress equations between contents of water and 210Pb of different cores are obtained. The correlation coefficients are quite big, indicating, remarkable correlationship between them. Both water contents and 210Pb are necessary and effective in the analysis of sedimental process.The contents of 137Cs and species of the sediments are also studied in this article. They justify the results of the computions of various points of view. |
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