Laboratory experiments were carried out to study the behavior of turbidity current under subcritical approach flow condition. In order to study the effects of solid obstacle and bed roughness on turbidity current, 24 experiments were conducted. Two trapezoidal macro-roughness elements with 0.01 m and 0.03 m height and three triangular obstacles with 0.1 m to 0.3 m height were used. The parameters such as front velocity, velocity profiles, body height, flow discharge, suspended load transport rate and efficiency of the obstacle were determined. It was found that under subcritical flow regime, the main portion of the turbidity current over the rough bed is controlled, if the obstacle height is 2–3 times of the body height. The growth of the front height depends on the inlet sediment concentration, the roughness elements and the obstacle height. The front velocity upstream of the obstacle over the smooth bed is independent of the obstacle height and significantly influenced by roughness elements. Simultaneous use of the bed roughness and obstacle significantly reduces the front velocity downstream of the obstacle. The flow discharge per unit width significantly decreases downstream of the obstacle. Simultaneous use of an obstacle and roughness elements decreases the flow discharge per unit width by about 90%. An obstacle with height equal to 0.75 of the initial height of the turbidity current with the smooth bed blocks about 65% of the suspended sediment. While, simultaneous use of the obstacle and the roughness elements blocks about 95% of the suspended sediment.

进行了实验室实验，研究了亚临界进流条件下浊流的行为。为了研究固体障碍物和床层粗糙度对浊流的影响，进行了24次实验。使用了两个高度为 0.01 m 和 0.03 m 的梯形宏观粗糙度单元和三个高度为 0.1 m 到 0.3 m 的三角形障碍物。确定了前方速度、速度剖面、车身高度、流量、悬浮负载传输率和障碍物效率等参数。研究发现，在亚临界流态下，如果障碍物高度为体高的2-3倍，粗糙床上方的浊流的主要部分得到控制。前沿高度的增长取决于入口含沙量、粗糙度要素和障碍物高度。光滑床面上障碍物上游的前沿速度与障碍物高度无关，并受粗糙度元素的显着影响。床粗糙度和障碍物的同时使用显着降低了障碍物下游的前沿速度。障碍物下游每单位宽度的流量显着减少。同时使用障碍物和粗糙度元素可使每单位宽度的流量减少约 90%。高度等于浊流初始高度的 0.75 的障碍物和光滑床阻挡了大约 65% 的悬浮沉积物。而同时使用障碍物和粗糙度元素可阻挡约 95% 的悬浮沉积物。