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Tidal bore flow velocity vertical distribution calculation method
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A technology of vertical distribution and calculation method, which is applied in the field of fluid mechanics, can solve problems such as the calculation formula or method of inrush current velocity that has not yet been formed, and achieve the effect of small calculation error
Active Publication Date: 2019-11-05
ZHEJIANG INST OF HYDRAULICS & ESTUARY
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However, most of the above achievements are sporadic tidal bore observation data or indoor test data, and there is no universal calculation formula or method for the vertical distribution of tidal current velocity.
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Embodiment 1
[0040] Embodiment 1: Calculation method for the vertical distribution of inrush current velocity, the implementation flow chart is as follows figure 1 shown, including the following steps:
[0041] Step 1, obtain relevant data. That is to obtain the parameters required for calculation, and use the method of on-site observation or experimental measurement to obtain the pre-tidal water depth h, pre-tidal flow velocity v, tidal height H, and the distance from the river bottom to be Z 1 The inrush current velocity V 1 . Through the comparison of historical data, the rationality of the above data is further verified.
[0042] Step 2, determine the type of tidal surge. Determine whether the tide is a wave tide or a swirling tide by the tide Froude number, the specific method is as follows:
[0043] a. Calculate the Froude number of tidal surge, that is, formula (1),
[0044]
[0045]
[0046] In the formula, U is the propagation velocity of tidal surge, v is the pre-tida...
Embodiment 2
[0072] Embodiment 2: The following is a further description based on the measured data of tidal surge.
[0073] Through the on-site observation of the self-recording water level meter and the three-dimensional acoustic Doppler current meter (ADV), the pre-tidal water depth h = 1.8m, the pre-tidal current velocity v = -1.47m / s, and the tidal height H = 2.6 m, the distance from the bottom of the river is Z 1 = Inrush current velocity V at 3.4m 1 = 4.15m / s.
[0074] First, using the above-mentioned pre-tidal water depth, tidal height, and pre-tidal flow velocity, Fr = 2.02 can be calculated from formulas (1) and (2). Since Fr ≥ 1.7, it is judged that the tidal surge is a vortex tidal surge.
[0075] Then, from the known distance Z from the bottom of the river 1 = 3.4m and the pre-tidal water depth and tidal height, substitute into formula (5) to calculate its relative position Z' 1 = 0.77. Due to Z' 1 >0.6, set V 1 and Z' 1 Substituting formula (7) to calculate the verti...
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Abstract
The invention discloses a tidal bore flow velocity vertical distribution calculation method. The tidal bore flow velocity vertical distribution calculation method comprises steps that: related data isacquired; the type of the tidal bore can be determined; when the type of the tidal bore is determined as the wave-shaped tidal bore, a formula (4) is used to calculate the vertical distribution of the tidal bore; when the type of the tidal bore is determined as the rotary tidal bore, a formula (8) is used to calculate the vertical distribution of the tidal bore flow velocity. By taking tidal boreactual measurement data and water tank experimental data as basis, the distribution characteristics of the tidal bore flow velocity in the vertical line can be researched in a detailed way, by aimingat the obvious difference between the vertical distribution characteristics of the wave-shaped tidal bore and the rotary tidal bore, the calculation formula of the tidal bore flow velocity distributed along the vertical line can be provided based on a mathematical statistical method. According to the data, the formula is used to reflect distribution characteristics of the tidal bore flow velocityon the vertical line very well, and calculation errors are small. A powerful tool is provided for calculating the tidal bore flow velocity values on different positions on the vertical line can be provided in the engineering design or the tidal bore research.
Description
technical field [0001] The invention relates to the field of fluid mechanics, in particular to a calculation method, components and storage media for the vertical distribution of gushing current velocity. Background technique [0002] There are tidal surges in many strong tidal estuaries in the world, such as the Amazon River in Brazil, the Severn River in the United Kingdom, and the Hooghly River in India. There are two typical forms of tidal surge: one is of low intensity, and the tidal surge is a wave train composed of a series of waves advancing in parallel, called "wave tidal surge"; the other is when the intensity is large, free The surface breaks up, creating a forward-propelling roll of water known as a "tide tide" or "strong tide". The tidal surge of the Qiantang River is the most typical among all estuaries, and it is a very distinctive tourist resource and natural wonder. After the Qiantang River tidal surge was formed, the characteristics of the water flow chan...
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