Single width flow calculation formula | The simplest three steps for the bottom of the dam overflow surface

『Single width flow calculation formula』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)

1. Relationship between single width flow rate and flow velocity

The formula for calculating single width flow rate in hydraulics is q=Q/B;

1、 The unit in the formula is q-m ^ 2/s; Q-m^3/s; B -m；

2、 Since the basic quantities of hydraulics are length, time, and mass, and the number of independent factors is three, using dimensionless equations instead of dimensional equations can reduce the yield by three. This can significantly reduce the number of experiments and accelerate the experimental process in experimental analysis; In theoretical analysis, variable relationships can be proposed more reasonably. This method is called the Lizhong Grinding Theory method. 2. Hydraulic Calculation of Double Embankment Closure. The core of hydraulic calculation for Double Embankment Closure is to determine parameters such as drop, single width flow rate, single width energy, flow velocity, and their variation patterns, and analyze the coordination relationship between the upper and lower embankments. The specific calculation needs to be combined with engineering conditions, taking into account factors such as hydraulic parameters, construction difficulty, and the characteristics of the throwing materials. The following are key points:

1. Drop sharing and coordination with the embankment. Double embankment closure shares the total drop through the upper and lower embankments, and the sharing ratio needs to be determined according to engineering requirements. For example, when the diversion channel of the Three Gorges Project adopts double embankment vertical blocking for closure, the upstream embankment bears 2/3 of the drop, and the downstream embankment bears 1/3 of the drop. This ratio needs to

be verified through hydraulic calculations to ensure that the water flow conditions at the critical section of the closure are controllable. The sharing of the drop directly affects the speed of embankment advance: if the sharing ratio is not reasonable, it may lead to overload of one side of the embankment, causing erosion or loss of thrown materials. 2. Hydraulic parameter calculation of single width flow rate (q): the flow rate per unit width, reflecting the water flow intensity at the mouth of Suilong. The calculation formula is $q=Q/B $, where $Q $is the total flow rate and $B $is the width of the dragon mouth. The larger the flow rate per unit width, the stronger the scouring force of the water flow on the embankment, which needs to be balanced by the anti scouring ability of the thrown materials (such as block stones and concrete blocks). Single width energy (E): The total energy per unit width of water flow, calculated by combining flow velocity ($v $) and water depth ($h $). The formula is $E=alpha v ^ 2/(2g)+h $($alpha $is the kinetic energy correction coefficient, $g $is the gravitational acceleration). The single width energy determines the stability of the thrown material, and higher energy requires thicker materials. Flow velocity (v): The flow velocity at the dragon mouth directly affects the inlet position and stability of the throwing material. Excessive flow rate may cause material to be washed away, which needs to be controlled by adjusting the advance speed or throwing method of the embankment. 3. The advance coordination relationship between the upper and lower embankments needs to be synchronized to avoid the imbalance of the dragon mouth shape caused by excessive unilateral advance. For example, i

Single width flow calculation formula | The simplest three steps for the bottom of the dam overflow surface

1. Relationship between single width flow rate and flow velocity

『SILVER Official Website SERVICE』