Anhui and Huaihe River Institute of Hydraulic Research

Nomhon, China

Anhui and Huaihe River Institute of Hydraulic Research

Nomhon, China
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Yan D.,China Institute of Water Resources and Hydropower Research | Yan D.,Basin Water | Wang H.,China Institute of Water Resources and Hydropower Research | Wang H.,Basin Water | And 6 more authors.
Shuikexue Jinzhan/Advances in Water Science | Year: 2017

With the increasing impacts of both climate change and human activities, river basins were usually facing multiple water issues, which can impact water quantity, water environment, aquatic ecology and sediments. Simultaneously, increased frequencies of extreme hydrological events, such as droughts and floods, were observed. Thus, systematic management and retardation of extreme hydrological events became crucial goals of integrated water basin management. Raising the regulation capacity to multiple water cycling processes in a river basin is an important pathway. In this paper, based on the judgement of the China's major water issues, we analyzed the shortage of traditional water basin management, which relied on changing status of water cycling processes, end-of-pipe control technologies and the process dissociation. We analyzed the overall demand of solving water problems from a systematic level under the changing environment, the general idea of the ecological sponge-smart river basins construction, and proposed the theoretical framework and the critical research questions of the ecological sponge-smart river basins. The construction of ecological sponge-smart river basins should base on (1) taking full consideration of the evolutional rules of multiple water cycling processes; (2) regulating human activities, including exploring water and land resources; (3) achieving the joint regulation among the surface-soil-underground hydrological processes, including water quantity, water quality, sediments and aquatic ecosystem. We aimed to utmost retard extreme hydrological events, construct and improve comprehensive service functions of a river basin and achieve the conservations of the ecological functions of the ecosystems, including mountains, rivers, farmland, forests and lakes. © 2017, Editorial Board of Advances in Water Science. All right reserved.

Wang B.,Anhui and Huaihe River Institute of Hydraulic Research | Zhang G.,Beijing Normal University | Duan J.,Jiangxi Institute of Soil and Water Conversation
International Soil and Water Conservation Research | Year: 2015

The poor growth of understory vegetation and the severe losses of soil and water in Pinus massoniana forests have recently become serious concerns in an area in southern China with eroded red soil. The influence of topography on the spatial distribution of vegetation, however, has received little attention. This study combined several multivariate analyses to discern the complicated relationship between understory vegetation and topography. Thirty-six plots (10 m×10 m) were sampled in a field survey of the vegetation and topography in the central red-soil region. The distributions of the understory vegetation differed significantly amongst the topographies. Most plants grew in gullies, and few grew on ridges. The low coverage (25.2%) and number of species (5 per plot) of the vegetation on ridges was due to serious soil erosion. Surface curvature and slope aspect were the first and second most important topographic factors, respectively, affecting the distribution of the vegetation. The relationship between topography and distribution could be described by a linear model. Surface curvature or slope aspect alone, however, could only explain 22.2–59.2% of the variance in distribution. The adaptation of vegetation to specific topographies should be considered for restorations of P. massoniana forests in the study area. The results of this study will be helpful for selecting potential sites for seeding and vegetation restoration to improve the ecology of the study area. Further studies will be needed to identify the mechanism of the distribution of the understory vegetation in these P. massoniana forests. © 2015 International Research and Training Center on Erosion and Sedimentation and China Water and Power Press

Li R.-Z.,Hefei University of Technology | Geng R.-N.,Hefei University of Technology | Huang Q.-F.,Hefei University of Technology | Qian J.,Anhui Institute of Environmental Science | And 2 more authors.
Zhongguo Huanjing Kexue/China Environmental Science | Year: 2017

From November 2015 to April 2016, nine field tracer experiments including four human disturbance scenarios were conducted in an agricultural headwater stream of Nanfei River, located in Chaohu Lake basin. To explore the nutrient retention efficiencies and its response to human disturbance for multi-pool morphological pattern in streams, conservative (NaCl) and non-conservative (NH4Cl and KH2PO4) solutes were co-injected at a constant rate. Based on the tracer experiments, hydraulic parameters and nutrient spiraling metrics were calculated. Test stream reach displayed striking turbulence characteristics through the nine tracer experiments and its flow belonged to subcritical flow. The decrease of Sw-NH4 (NH4 + uptake lengths) in the deep pool under human disturbances was significant with a drop from 331∼3304m to 232∼609m, while the PO4 3- uptake lengths Sw-NH4 increased slightly with a raise from 232∼609m to 301∼1100m.The Sw-NH4 decreased sharply from 4812∼58895m to 2463∼13955m, and the Sw-NH4 also dropped markedly from 6242∼75285m to 1792∼11432m, in the straight sub-reach in the case of human disturbances. The falling ranges of Sw-NH4 and Sw-NH4 in the straight sub-reach greatly exceeded that in the pool sub-reach under human disturbances, suggesting that the straight sub-reach was highly affected by the human disturbance. Compared with the natural situation, the values of Vf-NH4 and Vf-PO4 both in straight and pool sub-reaches under human disturbances had an increase, which would be helpful to nutrient retention. From the point of the whole test stream, the effectiveness of human disturbance was feasible and effective for the improvement of nutrient retention efficiency. © 2017, Editorial Board of China Environmental Science. All right reserved.

Fang G.-H.,Hohai University | Wen X.,Hohai University | Yu F.-C.,Anhui and Huaihe River Institute of Hydraulic Research
Fresenius Environmental Bulletin | Year: 2013

Gucheng Lake has been suffering from eutrophication due to increased pollution and nutrient loads discharged into the watershed. Based on artificial neural networks (ANNs) and a 4-year record of water quality data (from 2006 to 2009), this study proposes an early-warning model for eutrophication aiming to predict the concentration of total nitrogen (TN) and total phosphorus (TP) of Gucheng Lake with a lead time of one week. To develop such data-driven models efficiently, a comprehensive sampling strategy is adopted to ensure that most relevant predictors for TN and TP are retained. Factor correlation analysis is then employed to further eliminate noisy predictors. The preferable selecting ranges of correlation coefficient values are proven to be [-1, -0.5] and [0.5, 1]. As a result, 6 and 18 input variables are filtered from 75 potential input variables to develop the TN and TP prediction models, respectively. The prediction models can achieve high performance. The validation results of TN (TP) showed that the correlation coefficient of 0.9915 (0.9945) and the RMSE of 0.0684 (0.0015), which have demonstrated the potential of ANN models to predict TN and TP conditions at Gu-cheng Lake.

Zhang J.,Anhui and Huaihe River Institute of Hydraulic Research | Zhang L.,Hohai University
Earthquake Engineering and Engineering Vibration | Year: 2014

Based on a Chinese national high arch dam located in a meizoseismal region, a nonlinear numerical analysis model of the damage and failure process of a dam-foundation system is established by employing a 3-D deformable distinct element code (3DEC) and its re-development functions. The proposed analysis model considers the dam-foundation-reservoir coupling effect, influence of nonlinear contact in the opening and closing of the dam seam surface and abutment rock joints during strong earthquakes, and radiation damping of far field energy dissipation according to the actual workability state of an arch dam. A safety assessment method and safety evaluation criteria is developed to better understand the arch dam system disaster process from local damage to ultimate failure. The dynamic characteristics, disaster mechanism, limit bearing capacity and the entire failure process of a high arch dam under a strong earthquake are then analyzed. Further, the seismic safety of the arch dam is evaluated according to the proposed evaluation criteria and safety assessment method. As a result, some useful conclusions are obtained for some aspects of the disaster mechanism and failure process of an arch dam. The analysis method and conclusions may be useful in engineering practice. © 2014 Institute of Engineering Mechanics, China Earthquake Administration and Springer-Verlag Berlin Heidelberg.

Yu F.-C.,Anhui and Huaihe River Institute of Hydraulic Research | Fang G.-H.,Hohai University | Shen R.,Anhui and Huaihe River Institute of Hydraulic Research
Environmental Earth Sciences | Year: 2014

Comprehensive early warning of drinking water sources is a multi-target, multi-level and multi-factor system. The complex nonlinear relationship between early-warning indicators and warning limit levels has not been founded. In the present study, the combination weight of early-warning indicators was first determined by combining Delphi–Analytic Hierarchy Process subjective weight and entropy objective weight. For uncertain characteristics of qualitative indicators, the grey weight matrix is obtained through grey evaluation theories. The grey-fuzzy comprehensive early-warning model was established based on advantages of combination weights, grey evaluation and fuzzy comprehensive evaluation theories. Then, a multi-factor and multi-level warning system, of which results were represented by ambiguity warning level, was put forward and applied to Gucheng Lake. The results showed that the comprehensive security degree of Gucheng Lake is 5.43, which is between warning level (degree is 6) and heavy warning level (degree is 4). This indicated that Gucheng Lake needs to improve protection measures and enhance the safety of drinking water source. © 2014, Springer-Verlag Berlin Heidelberg.

Zhang J.-K.,Anhui and Huaihe River Institute of Hydraulic Research | Yan W.,General Electric | Cui D.-M.,Anhui and Huaihe River Institute of Hydraulic Research
Sensors (Switzerland) | Year: 2016

The impact-echo (IE) method is a popular non-destructive testing (NDT) technique widely used for measuring the thickness of plate-like structures and for detecting certain defects inside concrete elements or structures. However, the IE method is not effective for full condition assessment (i.e., defect detection, defect diagnosis, defect sizing and location), because the simple frequency spectrum analysis involved in the existing IE method is not sufficient to capture the IE signal patterns associated with different conditions. In this paper, we attempt to enhance the IE technique and enable it for full condition assessment of concrete elements by introducing advanced machine learning techniques for performing comprehensive analysis and pattern recognition of IE signals. Specifically, we use wavelet decomposition for extracting signatures or features out of the raw IE signals and apply extreme learning machine, one of the recently developed machine learning techniques, as classification models for full condition assessment. To validate the capabilities of the proposed method, we build a number of specimens with various types, sizes, and locations of defects and perform IE testing on these specimens in a lab environment. Based on analysis of the collected IE signals using the proposed machine learning based IE method, we demonstrate that the proposed method is effective in performing full condition assessment of concrete elements or structures. © 2016 by the authors; licensee MDPI, Basel, Switzerland.

Ben P.,Anhui and Huaihe River Institute of Hydraulic Research | Yu B.,Anhui and Huaihe River Institute of Hydraulic Research | Ni J.,Anhui and Huaihe River Institute of Hydraulic Research | Xia D.,Anhui and Huaihe River Institute of Hydraulic Research
Advances in Science and Technology of Water Resources | Year: 2013

In order to investigate the flood discharge capacity, river regulation project and flood operation mode in the main reach of Huaihe River from Zhengyangguan to Wujiadu, a hydrodynamic numerical model was developed to simulate the flood routing based on the characteristics of this reach. This model is verified by the measured flood data in the year of 2005 and 2007. The verification results show that the model is accurate and provides a computing platform for the comprehensive treatment and optimal dispatching in flood detention areas of the main reach from Zhengyangguan to Wujiadu. The effect of the Jingshanhu flood detention area during the flood process in 2007 was analyzed by using this model. The computed results show that the use of the Jingshanhu flood detention area can reduce the water level at Tianjia'an station and increase the concentration velocity of the flood.

Yu B.-Y.,Anhui and Huaihe River Institute of Hydraulic Research | Yang X.-J.,Anhui and Huaihe River Institute of Hydraulic Research | Ni J.,Anhui and Huaihe River Institute of Hydraulic Research | Ben P.,Anhui and Huaihe River Institute of Hydraulic Research
Shuidonglixue Yanjiu yu Jinzhan/Chinese Journal of Hydrodynamics Ser. A | Year: 2014

The flood-flowing zone of the Middle Reach of the Huihe River is one of important components of the flood protection system of the Huihe River. The existing flood-flowing zones of the Huihe River consist of a lot of individual flood-flowing zones which are often used for flood flowing. However, the existing flood flowing zones are neither efficient nor economic. Further river engineering work for the Huihe River requires regulation of the flood-flowing zones of the Middle Reach of the Huihe River. After regulation of the flood-flowing zones, the discharge capacity of the flood-flowing zones of the Middle Reach of the Huihe River will affect the reallocation of river engineering work and the optimal allocation of flood-flowing zones. Key factors affecting the discharge capacity of the flood-flowing zones are: Geometry of flood-flowing zone, size and layout of the inlet-and-outlet gates for flood storage, hydraulic parameters of the inlet-channel to the flood-flowing zone and outlet-channel from the flood-flowing zone, etc. In this paper, both hydrodynamic simulation and physical experiments have been carried out to study the discharge capacity of 5 flood-flowing zones along the river reach from Zhengyangguan to Fushan of the Huaihe River. The results of the calculation and verified test show that the discharge capacities of these 5 flood-flowing zones in regulation have been determined.

Li R.-Z.,Hefei University of Technology | Huang Q.-F.,Hefei University of Technology | Yang J.-W.,Anhui and Huaihe River Institute of Hydraulic Research | Zhang R.-G.,Hefei University of Technology | Jin J.-L.,Hefei University of Technology
Zhongguo Huanjing Kexue/China Environmental Science | Year: 2016

A typical agricultural headwater stream was chosen as the representative to investigate the dynamic characteristics of effective flow for nutrient retention over a longer time scale, based on the change of regional hydrology, from the perspective of coupling the discharge probability density function and nutrient retention efficiency. Through the Monte Carlo simulation for discharge probability density function, the overall level of nutrient retention for the target stream was quantitatively evaluated as well as the most effective flow and the functionally equivalent discharge were calculated, according to the nutrient uptake velocity derived from field tracer experiments. The overall levels of retention capability for NH4 + and PO4 3- were quite low. The expected values of the retention efficiency of NH4 + and PO4 3- were 0.0671 (6.71%) and 0.0541 (5.41%), respectively. The most effective flow for NH4 + and PO4 3- were 0.0051m3/s and 0.0049m3/s, and the functionally equivalent discharge for them were 0.044m3/s and 0.043m3/s, respectively. In view of the fact of low nutrient uptake velocity in the stream, it is necessary to improve the nutrient retention efficiency of the target stream by reconstructing stream morphology and streambed geomorphology. © 2016, Editorial Board of China Environmental Science. All right reserved.

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