40 results about "River engineering" patented technology

The invention discloses a method for calculating the channel forming discharge of a tidal reach and belongs to the field of river regulation projects and channel regulation projects. The method includes the steps of firstly, building a tidal current mathematical model to calculate and research the annual hourly water level, discharge, spring tide differences of the flooding season and the dry season and the water level differences of the flooding season and the dry season of the selected section of the reach; secondly, dividing the discharge of one section of the reach into a plurality of equal discharge levels, and determining the occurrence frequency P of each discharge level; thirdly, calculating the Q<n>P product value corresponding to each discharge level; fourthly, drawing Q-Q<n>P relation curves, and finding the extreme value of a channel forming effect curve, wherein the discharge corresponding to the extreme value is the channel forming discharge; fifthly, analyzing channel forming discharge along the reach and section flooding season-dry season tide difference change, analyzing influence of tides and runoff power on the channel forming discharge, and analyzing the features of channel morphology shaped by reach water power. The method can be used for calculating the channel forming discharge of the tidal reach and provides important reference indexes for the planning and design of tidal reach riverway and channel regulation projects.

The invention provides a cam for driving a voice coil of a high-pressure jet flow type sound wave rain enhancement device suitable for Tianghe river engineering and a design method of the cam. The camis in externally tangent contact with a rocker arm pin roller with the radius of r in the rocker arm system; wherein the center of the rocker arm pin roller moves in a rigidly connected rocker arm system to form a trajectory curve of the center of the rocker arm pin roller, and the method is characterized in that the inward expansion r of the trajectory curve of the center of the rocker arm pin roller is used as a molded line of the cam, and the cam is designed according to the molded line. According to the method for solving the cam profile, compared with a traditional method, the complex geometrical relationship is avoided, the solving method is unified, and the continuity and smoothness of the cam are improved due to the fact that the information of surrounding points is effectively utilized, so that the dynamic smoothness of the cam is enhanced. Besides, cam molded line design is carried out based on the method, the driven voice coil can obtain the excellent dynamic performance ofshort-time opening and short-time closing, and therefore high-pressure jet flow air generates strong discontinuity, strong sound waves are excited, and the sound wave rain enhancement effect is enhanced.

The invention discloses a river engineering test water level gauge and a parameter calibration method thereof. The water level gauge includes a water level measuring device, a water tank, a probe for measuring the reference water level of the water tank, and a pressure sensor connected with the water tank and used for measuring the water outlet pressure of the water tank. A floating plate is fixedly arranged under the pressure sensor, and an ultrasonic probe opposite to the pressure sensor runs through the center of the floating plate, and both the ultrasonic probe and the pressure sensor are electrically connected to the water level measuring device. The parameter calibration method includes measuring the water level of the water cylinder z 盛水量筒 ; Measure the reference water level of the water tank z a , the vertical distance between the end face of the pressure sensor and the reference water level h 1 , the vertical distance between the end face of the ultrasonic probe and the water surface of the measuring cylinder h ;pass h 2 = z a - z 盛水量筒 - h 1 - h Obtain the vertical distance between the end face of the ultrasonic probe and the end face of the pressure sensor h 2 . Significantly reduce the observation links and human factors of the level follow-up method, reduce the influencing factors of the observation accuracy, and improve the observation accuracy.

The invention discloses a layered sampler for suspended sediment for river engineering model tests, which comprises a plurality of single-layer sampling structures, baffles and cross bars, and the single-layer sampling structure is a cuboid structure with a cylindrical sampling bin in the middle , the single-layer sampling structure is vertically overlapped and combined to form a multi-layer sampling structure, the holed plate is provided with a circular sampling hole with the same diameter as the sampling bin mouth, and the number of sampling holes in the baffle plate is less than that of the sampling bin One, the upper ends of the front and rear baffles are connected by cross bars; the present invention also discloses a method based on the above-mentioned layered sampler, which can sample the effect of multiple layers of suspended matter at one time, greatly shortening the sampling time of suspended matter in river engineering model tests. time.

The invention discloses a method for analyzing instantaneous sediment transportation intensity of pebble gravels through images. The method comprises the following steps: continuously acquiring moving sediment images within a preset time period; generating a measuring section for each image; extracting the measuring section at the same fixed position of each image, and reconstructing the extracted measuring sections into a diachronic graph according the sequence of the acquisition time; acquiring the border of each sediment particle in the diachronic graph, and determining the position of the sediment particle in the diachronic graph; counting the number of sediment particles; acquiring the number of total frames and the sampling frequency which are acquired within the preset time period, obtaining the acquisition time according to the number of total frames and the sampling frequency, and according to the acquisition time, the number of the counted sediment particles with the area larger than a preset value as well as positions of the sediment particles, generating a sediment transportation-time graph so as to generate a sediment transportation intensity-time relationship curve. The invention further discloses a system for analyzing the instantaneous sediment transportation intensity of the pebble gravels through the images as well as a method for measuring the instantaneous sediment transportation intensity of the pebble gravels through a river engineering model.