摘要
本文通过对南渡江河口区河沙资源的类型、分布特点和储量的调查,指出大量开采河沙所带来的环境问题,并提出了合理采沙和保护环境的具体措施。
Some environmental problems have emerged because of the excavation of the bed load in the Nandu River-mouth area. The statistic deposits of river sand resources in the area are about 1.3×10~7m^3, including the four types: the bed sand, the shoal sand, the river island sand and the dry land sand. In the deposits, however, it is only a volume of 400 000—600 000 m^3/a that can take part in the modern river process. At present, the excavated volume of sand (1 million m^3/a) has exceeded the above volume. The cut-down rate of the river bed (0.05—0.15 m/a), the erosion of the bank and the westward shift of the channel have been accelerated by the human action. Some suggestions are made for the rational exploitation of river sand resources and for environmental protection. Moreover, combining with the river management, an engineering plan of excavating sands and building a dam in the southeast of Xinbu bridge is presented.
出处
《热带地理》
北大核心
1993年第1期70-76,共7页
Tropical Geography
关键词
河沙资源
开发
环境保护
Sand resources
Envionmental protection
The Nandu River
