Formed Proceeding and Evolution Disciplinarian of Fan Delta
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摘要: 应用实验沉积学的方法对扇三角洲的形成过程及演化规律进行了较为详细的研究。指出扇三角洲的形成是突发性洪流与常态水流交替作用的结果,洪水期以碎屑流或泥石流沉积为主,平水期以牵引流沉积为主。随着沉积作用的延续,在基准面下降过程中,扇三角洲形态在平面上不同步增长,展宽速率大于伸长速率,扇三角洲的形态呈边缘圆滑的舌状。辫状河道的迁移摆动是导致扇三角洲演化的根本内在原因,而构造运动的强度与辫状河道的迁移摆动速率呈近似正相关关系。湖水深度、入湖坡降、辫状河道的形态、流量变化率以及粒径大小是影响扇三角洲演化的重要因素。Abstract: Formed proceeding and evolution disciplinarian of fan delta are studied in detail using experimental sedimentary.It points that formed of fan delta dues to alternating function of spasmodic flooding and usually flowing.Debris flood and mud rock flow are mainly sedimentary at flooding period,tractional current is main as a rule.In course of continuing of sedimentary,formed of fan delta is increaseing out of sync in plane and rate of stretch is larger than rate of elongation in the course of declining of datum plane.Formed of fan delta is smooth tongue in the edge of delta.Removing and waver of braided river course leads to evolution disciplinarian of fan delta.Tectonic motive intension is similar positive correlativity with removing and waver of braided river course.Deep of lake,slope of accessing lake,formed of braided river course,flow change rate and grain size are importance agent that affecting evolution of fan delta.
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Key words:
- simulate experiment /
- formed course /
- evolution disciplinarian fan detal /
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