The middle Huaihe River stability analysis and optimization of hydrological chaos forecasting model

Abstract

Based on the monthly flow time series data of main hydrological stations in the middle Huaihe River from 1985 to 2015, the river stability of Zhengyangguan-Bengbu and Bengbu-Fushan reaches is scientifically judged by nonequilibrium thermodynamics. The results show that the river pattern is in a stable state, and there is no transformation possible in a short time; the evolution of riverbed tends to be stable, and the influence of riverbed boundary conditions is greater than that of incoming water and sediment conditions. Based on fully understanding the stability of the middle Huaihe River, to improve the intelligence of hydrological forecasting, the chaotic characteristics of monthly flow time series are identified, then the artificial neural network forecasting model is optimized by chaos theory and optimization algorithms. Our findings suggest that the nonequilibrium thermodynamic analysis methods of river stability can provide a new idea for the study of river characteristics, and the forecasting model combined with chaos theory and optimization methods provide an effective technical means to improve the hydrological forecasting accuracy of the middle Huaihe River.

Experimental Study on the Slip–Stick Vibration of Plane Gate

“…In addition, the remaining gas in the pressurized hole cannot be discharged quickly because the vent hole is located at the back surface Generally, a plane gate is usually used as an emergency gate in high-head-water conservancy projects, and the emergency gate is closed in transient flow and opened in static water. In engineering, slip-stick vibration often occurs in the gate-closing process and can cause significant vibration of the hoist frame of approximately 1.25 mm [21]. Nevertheless, in view of its special operation conditions, slip-stick vibration of the plane emergency gate rarely occurs in the gate-opening process for static water.…”