| 摘要: |
| 将1855年、1934年、1959年、1984年的海图的深度基准面换算成为当地黄海平均海水面,把它们的深度变化转换成泥沙的冲淤变化。研究了套尔河湾海域及黄河改道后三角洲的冲淤演化规律,行水时是快速淤进;改道后,初期是强烈的侵蚀和冲刷,随着时间的推移,其速率均逐渐减慢,达到岸滩平衡剖面塑造后,发育为轻微淤进或此冲彼淤的稳定海岸。提出:冲淤速率≤0.056km/a,贝壳堤迅速发育是海岸稳定的标志;冲淤速率≤±0.084km/a,贝壳滩开始发育是海岸向稳定演化的标志。本海域5—10m海区的坡度小于1/2000,是平衡剖面海域的标志;坡度小于1/1500,是向平衡剖面发育的标志。这对认识近代黄河三角洲的冲淤演变以及对套尔河湾海岸的开发建设,都具有重要意义。 |
| 关键词: 淤积 冲蚀 演化 |
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| EROSION AND ACCUMULATION IN THE ADJACENT AREA OF THE TAOERHE BAY — WITH EMPHASIS ON EROSION-ACOUMULATION OF THE HUANGHE RIVER DELTA AFTER ITS SHIFTED COURSE |
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Huang Shiguang
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Geological Institute of Shengli Petroleum Administration, Dongying, Shangong 257015
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| Abstract: |
| In this study, water level depths indicated in maps of 1855, 1934, 1959, and 1984 were interpolated into present-day Yellow Sea average sea water level. A comparative analysis study was made of the erosion-accumulation evolutionary trends of the Taoerhe Bay and the Huanghe River after its course was shifted. Results of analysis suggest that when the Huanghe River emptied into the Taoerhe Bay, the coastline rapidly moved seaward with accumulation. After it changed its course, in the initial stage, the tidal flat was strongly eroded and scoured, but with lapse of time, the rate of erosion gradually slowed down, After the coastal balance profile was completed, development of the coastline became stable with slight accumulation or with erosion and accumulation here and there. It is proposed here that 1) when erosion-accumulation rate was <=0.056 km/a, stability of coastline was marked by rapid development of shell bank; 2) when erosion-accumulation rate was <=±0.084 km/a, the coastline trended to be stable when the shell bank began to develop. The < 1/2 000 slopes at depths of 5 - 10 m mark the sea area of the balance profile, while the < 1/1500 slopes mark development toward the balance profile. Conclusions derived from this study are of great significance for an understanding of the evolutionary trends of development of the modern Huanghe River Delta and are useful information for the development and construction of the coastal regions along the Taoerhe Bay. |
| Key words: Accumulation, Erosion, Evolution |
