53 results about "Hydrograph" patented technology

The invention discloses a method for forecasting water burst flood peak and peak time for a karst tunnel underground river. The method comprises the following steps: (1) computing point rainfall; (2) determining areal rainfall according to the point rainfall; (3) computing effective precipitation according to the areal rainfall; (4) computing time interval unit hydrograph; (5) computing effective precipitation unit hydrograph according to the time interval unit hydrograph; (6) computing surface runoff according to the effective precipitation and the effective precipitation unit hydrograph; (7) computing subsurface runoff; (8) adding the surface runoff at each time interval and the subsurface runoff at the corresponding time intervals to obtain flood discharge; (9) performing fitting on value of the flood discharge to obtain a flood hygrograph; and (10) obtaining the flood peak and the corresponding peak time on the flood hygrograph and determining construction time for a karst tunnel according to the flood peak and the corresponding peak time. According to the method provided by the invention, the water burst flood peak in the tunnel and the arrival time of the flood peak can be accurately forecasted, so that the construction time for the tunnel can be reasonably arranged, and the lives of people and the safety of mechanical equipment can be ensured.

The invention discloses a water level monitoring system based on image processing and a method, which mainly solve the problem that water level cannot be monitored automatically in the prior art. The water level monitoring system comprises a water level gauge, a water level image processing module, a wireless communication module and a central management server module. Working principle of the system is that: firstly the water level gauge is used for marking the water level, water level images marked by the water level gauge can be collected by a camera, the water level image processing module further performs automatic positioning, skew correcting and recognizing on the water level gauge in the water level images to obtain water level data and transmits the water level data to the wireless communication module through a wireless communication network, then the wireless communication module transmits the received water level data to the central management server module which stores the received water level data into a computer data base so as to draw current hydrograph in real time, when the current water level is higher than a preset water level, alarm information can be given out, and accordingly automatic monitoring of the water level can be achieved.

The invention discloses a design flood calculation method for a small watershed. Determine the hydrological station downstream of the small watershed, and obtain information such as the DEM map of the watershed above the hydrological station. Load the obtained information into the GIS software, extract the drainage system of the basin, cut it, divide it into multiple natural sub-basins, assign hydrological identification numbers, add hydrological units, and generalize the basin map. Obtain the rainfall runoff process of the annual maximum flood at the outlet section of the watershed above the hydrological station, and establish the hydrological model of the watershed above the hydrological station, so as to obtain the small watershed hydrological model parameters that can reflect the rainfall runoff process information of the small watershed to be calculated and designed. The method of calculating the hydrological frequency calculates the design rainstorm of the small watershed, and brings the design rainstorm into the well-defined small watershed hydrological model to derive the design flood process line of the small watershed. The invention realizes the design flood with higher precision that can reflect the information of the rainfall and runoff process in the small watershed through simple operations.