Applied Mechanics and Materials Vols. 675-677

Abstract: Taking Liguanpu riverside well field in Shenyang as the object, groundwater sustainable exploitation is calculated by groundwater flow numerical simulation method. Optimizing and adjusting the groundwater pumping wells will be more convenient and intuitive by established simulation model so that we can exploit groundwater resource reasonably , it is a good way to improve the production of water source. Groundwater sustainable exploitation is 10.03×10⁴m³/d. The optimized pumping well has contributed to infiltration recharge from captured surface water resources and adjacent groundwater lateral recharge. It benefits groundwater to be exploited and used in reason.

Abstract: The effect such as ion exchange, precipitation, corrosion and consolidation can occur between groundwater and rock mass, it will cause a variety of adverse effects on deep foundation pit engineering. Prediction of the underground water level and take corresponding precipitation control measures is very important. Underground water level deformation is a complicated ,nonlinear and stochastic problem, it is unable to establish accurate mathematical model. An underground water level deformation prediction model based on BP neural network was constructed in this paper. Five closely related factors in underground water level deformation are river flow, temperature, saturation deficit, rainfall and evaporation, they were selected as input vector of BP neural network, underground water level measured value as a model target output. In Matlab 2011b simulation software, 24 groups observation data for underground water level and five closely related factors of a underground parking lot deep foundation pit engineering in Jilin as the sample set,19 groups were randomly selected as the training sample set , other 5 groups were used as the testing sample set .The simulation result shows that testing value is very close to the true value in this method and the average relative error was 2.9708%.The method in this paper can achieve higher accuracy of groundwater level prediction in deep foundation pit engineering.

Abstract: Based on the inter-governance theory, social network theory and analysis of organizational relationships, as well as water management basin analysis, the basin water governance constitute a large and complex governance network, and the network performance as demonstrated by the network is the effectiveness of water management basin. This paper focuses on the analysis of water basin management network in order to improve the performance of basin water resources management network for the purpose of optimizing the function from the organization, inter-organizational relationships optimization, network optimization optimize the attempt to reform the three angles.

Abstract: To further clarify the impact of construction of the Three Gorges Reservoir on its tributaries. In this study, a three-dimensional hydrodynamic model of Changshou-Fuling section of Yangtze River was developed based on EFDC. Then an analysis of the hydrodynamics and the long term mass transport behaviors under backwater effect in the Taohuaxi River and Longxi River was presented. The results show that mainstream backwater effect plays a significant role in tributary during low-water period. And distinct circulation was shown in tributary estuary. However, in high-water period, estuarine circulation area in Longxi River decreased and disappeared, while the one in Taohuaxi River is still evident. Different input action from mainstreams to tributaries has been discovered.

Abstract: Three kinds of organic materials were used for culture experiment, namely livestock manures, natural organic materials and half decomposed organic materials. And the modified BCR sequential extraction procedure was used to analyze the morphologic changes of Mn. The study was focus on the effects of different kinds of organic materials on contents and morphologic changes of Mn in black soil. And the results show that different kinds of organic materials all increase the total Mn contents in soil. The amplifications of livestock manures and natural organic materials are higher then half decomposed organic materials. Comparing with fertilizers only, all kinds of organic materials increase the contents of each Mn fraction. For Weak acid soluble (Aci.) fraction of Mn, natural organic materials increase most, for Reducible (Red.) fraction, livestock manures increase most, for Oxidizable (Oxi.) fraction, all kinds of organic materials are nearly the same, and for Residual (Res.) fraction, livestock manures increase most. In addition, different kinds of organic materials also lead to morphologic transformation of Mn, comparing with fertilizers only, livestock manures lead to inert transformation, while natural organic materials lead to active transformation, and half decomposed organic materials lead to inert transformation.

Abstract: The Todini formulation is effectively a type of Q–H equation formulation and it has an extremely efficient approach to the inversion of the Jacobian matrix by partitioning the governing equations in a smart way. The advantage of the Todini formulation is that the Jacobian matrices are symmetric. The aim of this paper is to study the hydraulic calculation principle and analyze the relationship between physical parameters and hydraulic calculation for each step. The comprehensive resistance factor (r) is affected by the loss coefficient along the tracks (λ), and the loss coefficient along the tracks (λ) is affected by the Reynolds number (Re), the Reynolds number (Re) is affected by the kinematic viscosity (), and the kinematic viscosity () is affected by the temperature (T). The coupling of hydraulic characteristics and thermal properties of the fluid can be got by modifying the physical parameters, and this article provided evidences for the further study.

Abstract: Field-scale experiments were conducted through a subsurface wastewater infiltration system (SWIS), with effective depth of 0.8 m, under hydraulic loading rates (HLR) of 0.044, 0.071, 0.098 and 0.12 m³/(m² d). Taking the hydraulic and treatment efficiencies into consideration, HLR of 0.098 m³/(m² d) was recommended. Under this condition, NH₃-N, COD, TN and TP average removal efficiencies were 82.6%, 83.7%, 80.6 and 91.5%, respectively. This study will guide the control of operational parameter of a SWIS when it applies in decentralized wastewater treatment.

Abstract: The treatment performance and biofilm development of the start-up stage in an up-flow Biological Aerated Filter (BAF) with composite steel slag media is investigated, while the operating conditions is HRT 2h, temperature 23-27°C, DO 3-5mg/L. The results showed that the composite steel slag media BAF could be secussfuly operated in a short time, while the phosphorus could be removed 90% in 8 days as well as the ammonia nitrogen and COD could be removed 80% in 25 days after the beginning of reactor start-up. At the same time, the biofilm on the carrier could be observed and a lot of protozoa population, such as Rotifera, Vorticellidae and Parameciidae, could be characteristiced with optical microscope in the BAF system. It is conclued that the operation of the composite steel slag media BAF for nitrogen and phosphorus removal could be carried out quickly and conveniently, and provided a unique advantage for the future application.

Abstract: The advanced intelligent optimization algorithms used in water distribution network model study, currently in the pipe network optimization theory is a new, has great research value and practical value of the subject. This paper proposes a decision-making functions to optimize the drainage network system, by choosing the model using intelligent optimization algorithm for computing the most cost-caliber combination, to achieve the renovation and expansion of urban water supply network technical support.

Abstract: To solve the problem in the process of prefabrication of U-shaped canal, this paper mainly introduces the U-shaped canal production line that adopts production process of flowing water machine and continuous curing method. The production process can adapt to a variety of specifications U 300 - U1000 (length of concrete U-shaped canal products is 2000mm). Tank production line has production capacity of concrete U-shaped canal of 100 cubic meters every day. The production line can automatically run, in each location as well as human intervention, easy to control the production rhythm and production organization and management. Through the process, making the U-shaped canal can be manufactured in large-scale. It can play an important role in national food security, steady and rapid economic development and social harmony and stability on basis of water conservancy.