Xây dựng công thức thực nghiệm tính toán độ sâu sau nước nhảy trong kênh mặt cắt chữ nhật có xét đến ảnh hưởng của lực cản
Abstract
The sequent depth of the hydraulic jump is an essential characteristic of a hydraulic jump that directly affects the depth and length of the stilling basin after the spillway or culvert. Therefore, establishing formulas for accurately calculating the sequent depth of a hydraulic jump is very necessary and has high practical significance. This paper presents the establishment and testing of the empirical formulas to calculate the conjugate depths ratio of a hydraulic jump, applied to the horizontal prismatic channel with a rectangular cross-section, considering the influence of friction. Buckingham's theorem is used to determine the relationship between the conjugate depths' ratio of a hydraulic jump and other hydraulic factors. Hager and Bretz's experiment data on hydraulic jumps were used to determine the coefficients and test the formulas. Independent test results show that the mean absolute percentage error is less than 2% and the determination coefficient R2 is approximately equal to 1. Thus, the proposed formulas have a simple form and a wide application range, ensuring high accuracy in calculating results
