The historical formation and development of the abandoned channel of the Yellow River is reviewed and its causes of formation and present condition of prevention and control are analyzed in this paper. Based on this a...The historical formation and development of the abandoned channel of the Yellow River is reviewed and its causes of formation and present condition of prevention and control are analyzed in this paper. Based on this analysis, some ideas about control, critical problems and countermeasures in the next period are proposed with two typical control models as examples. We suggest that in preventing and controlling the wind-drift sandy lands in the region, the emphasis should be to develop, with a greatly expanded effort, a recycling economy. This should realize a combination of two ideas, i.e. integrate combating desertification with a structural adjustment of agricultural and an increase in the income of farmers.展开更多
This paper analyzes the changing trends of the Lower Yellow River(LYR) transverse profile parameters and their aberrance points by the time series analysis method.Research results show that there has been a trend of c...This paper analyzes the changing trends of the Lower Yellow River(LYR) transverse profile parameters and their aberrance points by the time series analysis method.Research results show that there has been a trend of changes in the LYR channel transverse profile parameters since the 1950s.The main river channel has a tendency of shrinkage year by year and the trend will be continued in the future.The main features of the LYR channel shrinkage are remarkable reductions of bankfull dis-charges and bankfull areas,corresponding decreases of bankfull widths,average bankfull water depths and maximal bankfull water depths,as well as increases of bankfull water levels and width-depth ratios accompanied.The discriminant parameters for threshold of the LYR main channel shrinkage were put forward.It indicates that the LYR main channel began to shrink in the 1970s and has entered into a serious phase of channel shrinkage since the 1990s.The incompatible index of discharged water-sediment processes of the Sanmenxia Reservoir was introduced,which revealed that there was a trend of increasing in the incompatibility between water flow and sediment load.Response relations between the LYR main channel shrinkage parameters and discharged water-sediment processes of the Sanmenxia Reservoir were founded,which indicate that the LYR main channel shrinkage can be mitigated and improved through the regulation of discharged water-sediment processes of the reservoir,especially through the regulation of water-sediment incompatible index.The LYR channel for water and sediment transportation can be restored and maintained.展开更多
黄河流域古河道的变迁对文化遗址形成的影响,是黄河文化研究的重要科学问题之一。内蒙古巴彦淖尔国家地质公园位于黄河中上游的河套盆地,公园内汉代临戎古城遗址的位置一直存在争论,确定黄河古河道与其相对位置关系是关键。通过对临戎...黄河流域古河道的变迁对文化遗址形成的影响,是黄河文化研究的重要科学问题之一。内蒙古巴彦淖尔国家地质公园位于黄河中上游的河套盆地,公园内汉代临戎古城遗址的位置一直存在争论,确定黄河古河道与其相对位置关系是关键。通过对临戎古城遗址周边10 km范围进行网格化槽型钻取心,利用钻孔数据构建三维粒度属性模型与沉积结构模型,对隐伏的古河道位置进行了较为精准地确定;并通过钻孔岩心沉积相分析与年代学测试,对古河道的沉积结构与年代进行了验证。结果表明,临戎古城遗址西3 km处存在(2.39±0.24) ka~(1.36±0.05) Cal ka BP的黄河古河道,自南向北流经临戎城西。以此确定的黄河与朔方郡各属县治城的相对位置符合史料的记载。本研究从沉积学角度为巴彦淖尔国家地质公园临戎古城遗址位置的考证提供了地质科学依据。展开更多
文摘The historical formation and development of the abandoned channel of the Yellow River is reviewed and its causes of formation and present condition of prevention and control are analyzed in this paper. Based on this analysis, some ideas about control, critical problems and countermeasures in the next period are proposed with two typical control models as examples. We suggest that in preventing and controlling the wind-drift sandy lands in the region, the emphasis should be to develop, with a greatly expanded effort, a recycling economy. This should realize a combination of two ideas, i.e. integrate combating desertification with a structural adjustment of agricultural and an increase in the income of farmers.
文摘This paper analyzes the changing trends of the Lower Yellow River(LYR) transverse profile parameters and their aberrance points by the time series analysis method.Research results show that there has been a trend of changes in the LYR channel transverse profile parameters since the 1950s.The main river channel has a tendency of shrinkage year by year and the trend will be continued in the future.The main features of the LYR channel shrinkage are remarkable reductions of bankfull dis-charges and bankfull areas,corresponding decreases of bankfull widths,average bankfull water depths and maximal bankfull water depths,as well as increases of bankfull water levels and width-depth ratios accompanied.The discriminant parameters for threshold of the LYR main channel shrinkage were put forward.It indicates that the LYR main channel began to shrink in the 1970s and has entered into a serious phase of channel shrinkage since the 1990s.The incompatible index of discharged water-sediment processes of the Sanmenxia Reservoir was introduced,which revealed that there was a trend of increasing in the incompatibility between water flow and sediment load.Response relations between the LYR main channel shrinkage parameters and discharged water-sediment processes of the Sanmenxia Reservoir were founded,which indicate that the LYR main channel shrinkage can be mitigated and improved through the regulation of discharged water-sediment processes of the reservoir,especially through the regulation of water-sediment incompatible index.The LYR channel for water and sediment transportation can be restored and maintained.
文摘黄河流域古河道的变迁对文化遗址形成的影响,是黄河文化研究的重要科学问题之一。内蒙古巴彦淖尔国家地质公园位于黄河中上游的河套盆地,公园内汉代临戎古城遗址的位置一直存在争论,确定黄河古河道与其相对位置关系是关键。通过对临戎古城遗址周边10 km范围进行网格化槽型钻取心,利用钻孔数据构建三维粒度属性模型与沉积结构模型,对隐伏的古河道位置进行了较为精准地确定;并通过钻孔岩心沉积相分析与年代学测试,对古河道的沉积结构与年代进行了验证。结果表明,临戎古城遗址西3 km处存在(2.39±0.24) ka~(1.36±0.05) Cal ka BP的黄河古河道,自南向北流经临戎城西。以此确定的黄河与朔方郡各属县治城的相对位置符合史料的记载。本研究从沉积学角度为巴彦淖尔国家地质公园临戎古城遗址位置的考证提供了地质科学依据。
