A method of judging the most unfavorable operating conditions of sluices through mathematical models

Abstract

The invention discloses a method for distinguishing most disadvantageous operation conditions of water gates through a mathematic model, and belongs to the technical field of basic hydrodynamic mathematic models. The method comprises the following steps of firstly setting different gate openings; extracting an upstream water depth value, a downstream water depth value and a vertical mean velocity in each test point on a central axis of a gate hole to obtain on-way distribution conditions of the water depth values under different flood discharge conditions, wherein a test position is on the central axis of the gate hole, and the test intervals are from a water gate axis to a deep water place which is at least 6-8 times in front of the gate and from the water gate axis to a downstream place with a stable water level; calculating a dynamic water pressure head and a static water pressure head, wherein a specific value of the dynamic water pressure head to the static water pressure head is specific energy (as shown in the specification); and calculating on-way change conditions and mean specific energies of the specific energies under different flood discharge conditions, wherein the mean specific energy is an arithmetic mean value of the specific energies on the way. According to the method, the most disadvantageous operation conditions can be determined through specific energies, so that the technical problem that the washing of waterworks under unreasonable operation conditions is difficult to determine is solved.

Description

technical field [0001] The invention belongs to the technical field of basic hydraulic dynamics mathematical models, and in particular relates to a method for judging the most unfavorable operating conditions of a sluice through a mathematical model. Background technique [0002] During the operation of various large and small sluices such as tidal sluices, flood discharge sluices, and barrages, scour damage is very common, and even leads to damage to the apron and seaman. The scouring damage of the sluice directly affects the operation safety of the sluice. The Nan'an Lv'an river barrage project in Jinjiang, Fujian Province was completed less than four years ago. The depth of the scour pit under the gate reached 10.8m, and the apron under the gate was washed away; Severe erosion, the elevation of the bottom of the scoured pit is about -9.0m, and the elevation of the gate floor is the lowest -0.5m; the large sluice of Beixi Nanbei Port on the Jiulong River has been repaired ...

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Problems solved by technology

[0005] In order to overcome the shortcomings of traditional physical model tests that are limited by manual operation and measuring instruments, it is difficult to perfect the measurement of complex three-dimensional flow fields, and to solve the above technical problems, the present invention provides a method for judging the most unfavorable operation of sluices through mathematical models. According to the method of operating conditions, establish a two-dimensional mathematical model, and then set different sluice gate openings according to the actual operation of the sluice, simulate and analyze the distribution of the water level field flow velocity in each operating condition, and determine the most unfavorable working condition through the specific energy, which solves the problem that is difficult to determine. Technical problems of scoured hydraulic structures under unreasonable working conditions

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