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| 晚更新世以来黄河、长江入海泥沙对南黄海沉积作用的影响 |
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李凡, 姜秀珩, 宋怀龙
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中国科学院海洋研究所
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| 摘要: |
| 黄河以其巨大的沙量闻名于世,其多年(1951-1980年)平均输沙量为1.069×109t。近十余年来,由于加强了水土保持和各种引黄工程的兴建等原因,向海输沙量减少,但含沙量仍居世界之冠。长江年平均输沙量也达4.75×108t,居世界大河之第四位。这两条大河目前虽不直接注入南黄海,但是大量资料表明,更新世以来,它们都曾在相当长的时间里注入南黄海,在低海面时期甚至奔流于南黄海陆架区,在漫长的地质历史中它们不断输送巨量泥沙,造就了规模不同的堆积地貌,沉积了不同厚度的沉积物层。因此,从某种意义上说,南黄海曾经是黄河和长江交汇沉积的盆地,黄河、长江在本区的发展演变史，就是南黄海沉积作用的发育史。 |
| 关键词: 晚更新世、黄河、长江入海泥沙、沉积作用 |
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| 基金项目:中国科学院海洋研究所调查研究报告第2147号 |
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| INFLUENCE OF THE HUANGHE AND CHANGJIANG RIVERS SEDIMENT LOADS ON SOUTH YELLOW SEA SEDIMENTATION SINCE LATE PLEISTOCENE |
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Li Fan, Jiang Xuhang, Song Huairong
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Institute of Oceanology, Academia Sinica
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| Abstract: |
| The Huanghe and Changjia paleo-rivers developed before high sea level in Holocene formed a broad fluvial plain and river mouth delta on the South Yellow Sea continentai shalf. Use of high resolution geophysical instruments revealed buried the Huanghe and Changjiang paleo-rivers valleys at more than 100 stations. The old Huanghe River which formed after high sea level in Holocene and before change of it's course in 1855 A D, emptied through the Subei Plain into the South Yellow Sea for 700 years resulting in formation of the accumulation shore plain of 104km2 and the north old Huanghe-changjiang combined delta of 3*104km2，besides, the old Huanghe River transported (250-400*104t/a) sediment to the center part of the South Yellow Sea to form thin Holocene sediment layer. More than 99% of the sediment load from the modern Huanghe River deposited in the Bohai Sea. Less than 1% is transported and round the Chengshan Cape to affect the northwest part of the South Yellow Sea. However there is only small immediate influence on the center and deeper part because of the presence of the Huanghai Cold Water Mass. Sediment loads from the modern Changjiang River were mainly transported southeastward and eastward. A part of it can be carried into the South Yellow Sea. The South Yellow Sea historically was a mixed deposition area of sediment from the Huanghe and Changjiang rivers, but the modern accumulation rate is small. |
| Key words: HUANGHE AND CHANGJIANG RIVERS SEDIMENT LOADS,SOUTH YELLOW SEA SEDIMENTATION, LATE PLEISTOCENE |
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