THE ROLE OF THE AKOSOMBO DAM ON THE VOLTA RIVER IN CAUSING COASTAL EROSION IN CENTRAL AND EASTERN GHANA (WEST-AFRICA)
THE ROLE OF THE AKOSOMBO DAM ON THE VOLTA RIVER IN CAUSING COASTAL EROSION IN CENTRAL AND EASTERN GHANA (WEST-AFRICA)
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DOI：
10.1016/0025-3227(80)90108-5
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发表时间：
1980-01-01
期刊：
影响因子：
2.9
通讯作者：
LY, CK
中科院分区：
文献类型：
--
作者：
LY, CK
西非沃尔特河的泥沙供应受到最近在河上修建的阿科松博大坝的严重影响。大约99.5%的河流流域现已被大坝堵塞，河流目前仅向海岸线供应少量来自大坝以下沿海平原低洼地区的沙子。通过比较大坝建设前后的航空照片和地图确定的海岸线退缩的平均速率，研究了河流对加纳中部和东部海岸线位置变化的贡献的减少的影响。大坝建设不会对大坝建设前没有从河流中吸沙的地区的海岸变化产生任何影响。在河流贡献为主要过程的地区，其影响表现为海岸线后退的加速。
Sediment supply from the Volta river in West Africa is greatly affected by the Akosombo Dam built recently on the river. Approximately 99.5% of the river drainage basin is now blocked by the dam, and the river is at present supplying to the shoreline only a minor quantity of sand derived from the low-lying areas of coastal plains below the dam. The effects of the reduction of the river's contribution in changing shoreline position in central and eastern Ghana were examined by comparisons of the average rates of shoreline retreats determined from aerial photographs and maps during the periods before and after dam construction. Construction of the dam does not have any effect on coastal change in the areas which did not receive sand from the river before dam construction. In the areas where river contribution was a major process, the effects are manifested by an acceleration of shoreline retreat.