摘要
入湖三角洲的形成主要受到流量、下游水位及上游来沙等因素的影响。在对后二者的影响规律研究基础上,为探索不同流量条件下入湖三角洲的演变特征,开展了进一步的试验研究。通过对三角洲的河道面积占比、摆动角度、河道长度、泥沙堆积等几何特征的分析,探讨了流量对入湖三角洲演变的影响。研究发现:三角洲的演变过程整体上遵循"冲-淤-冲"的发育模式;相比低流量,河道在高流量下稳定性更高且更明显,面积占比较大;泥沙堆积对流量响应敏感,大流量下沙体更加散乱且展布面积更大,小流量下泥沙更加聚集,稳定性更高。
The formation of the lake delta is mainly affected by factors such as flow rate,downstream water level and upstream sediment.Evolution characteristics of the delta under the influence of different dischargeare studied.By the analysis of the geometric characteristics of the delta,such as the proportion of river area,swing angle,river length,sediment accumulation and so on,it is found that the processes of the delta as a whole follows the development model of"scouring-deposition-scouring".Compared with the low flow,the river channel has higher stability and more obvious under the high flow,and the area accounts for a larger area.The sediment accumulation is very sensitive to the flow response,and the sand deposition is more scatter and spreads in a larger area under high flow,and the deposition sand is more stable under low flow.The results of the study will provide technical support for the planning of the river delta into the lake and the ecological protection of the basin.
作者
徐海珏
刘欣悦
宋晓龙
白玉川
XU Hai-jue;LIU Xin-yue;SONG Xiao-long;BAI Yu-chuan(State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300350,China;Institute for Sediment on River and Coast Engineering,Tianjin University,Tianjin 300350,China)
出处
《泥沙研究》
CAS
CSCD
北大核心
2022年第1期30-36,58,共8页
Journal of Sediment Research
基金
国家自然科学基金项目(51879182)。
关键词
入湖三角洲
摆动角度
流场
河道演变
泥沙淤积
lake intake delta
swing angle
flow field
riverbed evolution
sediment deposition
