Proportional-integral (PI) control, as one of the most popular classic control methods, has been applied widely to real-world practice canal automatic control. The performance a PI controller largely depends on two key parameters, namely proportional constant Kp and integrational time Ti. Rather than tuning these parameters empirically or in terms morphology, this study proposes linear quadratic regulator (LQR) determine their optimal values. proposed LQR utilizes an integrator delay model...

The key point of PI feedback control is how to design appropriate controller parameters. This paper combined the linear quadratic optimizing theory an online for constant downstream water-level operation which could respond different working condition properly and rapidly avoiding complex parameters adjusting. Based on Integrator-Delay (ID) model simplified from Saint-Venant Equations, we established discretized time invariant system canals. Then transferred it into state-space equations...

Abstract This paper proposes a linear model that relates the pressure head variations at downstream end of an inverted siphon to flow rate two ends. It divides in into low-frequency part and high-frequency part. The parts are caused by deformation wall reflection acoustic wave, respectively. In order build simplified relation between variations, Preissmann slot method (PSM) is adopted this paper. can also be used other forms structures, such as pipes tunnels, where pressurized condition...

The emergency control of Menglou~Qifang inverted siphon, which is about 72 km long, the key to safety Northern Hubei Water Transfer Project. Given complicated layout this project, traditional method has been challenged with fast hydraulic transient characteristics pressurized flow. This paper describes application model predictive (MPC), a popular automatic algorithm advanced in explicitly accounting for various constraints and optimizing operation, condition. For prediction pipe-canal...

In recent years, China has been building several inter-basin water conveyance projects across mountains and deep valleys, leading to the extensive use of long tunnels inverted siphons. The dynamics mixed free-surface-pressurized flows are critical for tunnel design operational safety. However, traditional numerical computation schemes cannot precisely efficiently capture pressure interface because may be more than 70 km long. This study aims develop a hybrid scheme that is as fast...

Transition between free-surface and pressurized flows is a crucial phenomenon in many hydraulic systems. During simulation of such phenomenon, severe numerical oscillations may appear behind filling-bores, causing unphysical pressure variations computation failure. This paper reviews existing oscillation-suppressing methods, while only one them can obtain stable result under realistic acoustic wave speed. We derive new method with first-order accuracy. simple contains two parameters, Pa Pb,...

For design and management of large scale tunnels, it is important to model the transitions between pressurized free-surface flows inside them. The flow regimes are separated by a discontinuity with different wave speeds on two sides, which makes efficient accurate simulations still challenging. A robust conservative space-time adaptive mesh refinement (AMR) strategy proposed simulate such transient mixed flow. In present AMR, resolution refined adaptively near interface regimes, states at...

Transition between free-surface and pressurized flows is an crucial phenomenon in many hydraulic systems, including water distribution urban drainage etc. During the transition, force exerted on structures changes drastically, thus it meaningful to simulate this process. However, severe numerical oscillations are widely observed behind filling-bores, causing unphysical pressure variations even computation failure. In paper, some oscillation-suppressing approaches reviewed evaluated a...

In order to design controllers for canals with inverted siphon especially very long siphon, it is necessary learn its response property. Compared open canals, the water movement in different due fast travelling speed of wave and high pressure. It impossible use openchannel model describe invert section, delay caused by haven’t been discussed existing literature. This paper proposes a which contains an integrator low frequencies, constant gain frequencies. By comparing results simulation,...

Hydraulic simulation models offer unlimited opportunities for improving the performance of irrigation canal systems by studying flow behavior in a large and complex network under variety design management scenarios. This paper presents an inner boundary junction-point water stage prediction correction method, which deals with abrupt section change gates. To reduce number global iterations step, acceleration method local updates is also proposed. The results show that proposed satisfies C...