Urban pluvial flooding is a threatening natural hazard in urban areas all over the world, especially recent years given its increasing frequency of occurrence. In order to prevent flood occurrence and mitigate subsequent aftermath, water managers aim predict precipitation characteristics, including peak intensity, arrival time duration, so that they can further warn inhabitants risky take emergency actions when forecasting flood. Previous studies dealt with prediction are mainly based on...

The Central Arizona Project (CAP) has been supplying Colorado River water to for roughly 25 years. CAP canal is operated remotely with a supervisory control and data acquisition (SCADA) system. Gate-position changes are made either manually or through the use of automatic controls controlled-volume approach. In this paper, writers examine potential application water-level difference control, new feedback canal-control method. main objective method keep downstream errors in equal pools. model...

A new Proportional-Integral (PI) tuning method based on Linear Matrix Inequalities (LMIs) is presented. In particular, an LMI-based optimal control problem solved to obtain a sparse feedback that provides the PI tuning. The ASCE Test Canal 1 used as case study. Using linearised model of canal, different tunings for design controller are developed and tested using software Sobek. Furthermore, proposed also compared with other same canal available in literature. Our results show reduces by...

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...

Real-time monitoring and forecasting are essential to ensure an on-time on-demand supply of water diversion projects. However, transfer systems currently lack spatiotemporal data in a dense resolution, failing monitor real-time conditions test plausible scenarios. To address the problem, this paper proposes novel digital twin framework. It includes self-correcting model, which combines (1) hydraulic solver using one-dimensional Saint-Venant equations; (2) method updating states driven by...

Most studies of open canal automation concentrated on the control single pool or cascaded multiple pools, neglecting hydraulic coupling effects between main and lateral canals. Low transmission efficiency poor equity agriculture water delivery may be caused in practical application large-scale irrigation networks. Considering high computation communication requirements for operating systems, a distributed model predictive (DMPC) algorithm based alternating direction method multipliers (ADMM)...

In order to automatically and safely control long distance water delivery projects in winter, there is a need for reasonable feasible transition mode avoid the emergence of ice jam. Based on open canal hydraulics, mathematical model system operated by constant downstream depth method developed. The principle combining feed-forward discharges with feedback level adopted operation check gates simulation multiple serial sections established. Also, parameters proportional-integral (PI)...

Abstract The formation of ice jams is sudden, and they will cause abnormal water level fluctuations in diversion projects, affecting the supply even causing severe flood disasters. Based on characteristics Middle Route South-to-North Water Diversion Project, this paper uses numerical simulation method to establish an emergency intervention effect model for jam events. hydraulic response project under gate group scheduling taking different measures are analyzed with deviation stabilization...

明渠输水系统的着生藻类异常增殖会淤塞拦污栅,降低明渠输水能力,并增加清理工作压力。目前,有关着生藻类对水动力的响应研究多在天然河流、湖泊中开展野外原型观测,针对混凝土衬砌表面着生藻类的水动力研究仍然少见。由于混凝土基质与泥沙基质的显著差异,着生藻类在衬砌明渠和自然水体中对水动力的响应特性不同。为探究水动力对明渠着生藻类生长及群落结构的影响,特开展明渠中着生藻类的培养观测及水动力冲刷实验。通过分析着生藻类叶绿素a含量、群落结构、无灰干重、细胞密度等指标,以探究不同基质粗糙度、不同生长阶段的着生藻类对不同水动力条件的响应。结果表明:着生藻类建群过程具有3个明显阶段,分别为迟滞期、指数生长期、稳定期;随着流速增大,着生藻类生物量先上升后下降,当流速v>0.6 m/s时,着生藻类的生长被显著抑制;冲刷流速增大至v=0.8...

The PID controller is widely used in the automatic water conveyance system of canal. However, conventional has poor adaptability to canal operating conditions, and along with variation we must continuously adjust control parameters, it brings some difficulties practical operation. And online self-adapting parameters also problem difficult solve controller, so combined fuzzy control, designed self-adaptive applied When operates, according actual response computer uses reasoning, optimal...

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...

Abstract Most studies about the automatic control of open canal irrigation systems only focus on distant downstream water level, which ignores fact that offtakes may be located anywhere along canal. Such a simplified strategy is likely to result in uncontrollable and inefficient delivery. Therefore, multi-point hydraulic method proposed, Saint-Venant model formulated describe states multiple controlled points. Then, it underlined points with without have different objectives. It suggested...

In the open channel control algorithm, good feed-forward controllers will reduce transition time of canal and improve performance. Feedforward algorithms based on active storage compensation are greatly affected by delay time. However, there is no literature comparing three most commonly used algorithms, namely volume step compensation, dynamic wave principle water balance models, under operation mode constant level downstream. order to compare existing avoid calculation calculating...

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...

Identifying operational losses in irrigation canals can be difficult due to inaccurate simplification designing and operating national guidelines. However, this study aims provide a practical solution problem by identifying losses, which are the primary cause of off-farm water losses. The method involves simulating daily delivered individual Irrigation Units (IUs) through off-take structures using hydraulic simulation. agricultural demand for IUs is then calculated crop growth model system...

Sluice gate is the key factor of accuracy in a canal simulation system. Due to coupled relationship between Saint-Venant equations and discharge gates, flow rate at time calculated from sampling water depth gathered last step. The article analyzed this approximation data based on complete Then, according combination inverted siphon sluice middle route South-to-North Water Transfer Project, paper studied influence structure calculation put forward that operation mode with constant upstream...

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...