Chendi Zhang

Chinese Academy of Sciences

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Marwan A. Hassan

University of British Columbia

Mengzhen Xu

Tsinghua University

Zhaoyin Wang

Tsinghua University

Wang Zhaoyin

Institute of Mountain Hazards and Environment

Yuncheng Xu

China Agricultural University

Xu Mengzhen

Shanxi Medical University

R. Li

Henan Energy & Chemical Industry Group (China)

Shikang Liu

Sichuan University

Bochong Wang

Yanshan University

Li Liu

China National Petroleum Corporation (China)

Cooperative Institutions

Chinese Academy of Sciences

Tsinghua University

Sichuan University

University of Chinese Academy of Sciences

State Key Laboratory of Hydraulics and Mountain River Engineering

University of British Columbia

Institute of Geographic Sciences and Natural Resources Research

State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering

Xi'an Jiaotong University

Nanchang University

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A Unit-Scale Framework for Designing Step-Pool Sequences

Journal of Hydraulic Engineering (2022)

Chendi Zhang Marwan A. Hassan Matteo Saletti André Zimmermann Mengzhen Xu

Artificial step-pool sequences have long been used in river restoration projects worldwide for channel stabilization and ecological improvement. However, previously used design methods for artificial step-pools are problematic in that the designed sequences may not fulfil restoration objectives and fail. We propose a new design framework consisting of five modules based on the morphological evolution, energy dissipation, hydraulics, and stability of step-pools. This new framework focuses on individual units instead of a reach or subreaches as done in previous approaches, allowing for greater design flexibility. A detailed description of the new unit-scale design framework is presented in this paper with step-by-step procedures and recommended criteria for design evaluation. The new framework is then applied to three mountain streams to evaluate existing artificial and natural step-pool sequences. Finally, advantages and limitations of the framework and insights for restoration of mountain streams are reviewed.

Hydraulics

Stream Restoration

10.1061/(asce)hy.1943-7900.0002033

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Regionalization of Flash Floods in the Hengduan Mountains, China; with Graph Neural Network Methods

Yifan Li Chendi Zhang Shunyu Yao Guotao Zhang

Flash flood

10.3850/iahr-hic2483430201-454

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Experimental study on the effect of turbulence in pipelines on the mortality of Limnoperna fortunei veligers

Ecological Engineering (2017)

Chendi Zhang Mengzhen Xu Zhaoyin Wang Wei Liu Dandan Yu

Mytilidae

Veliger

10.1016/j.ecoleng.2017.08.024

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Citations (14)

Flow-Sediment Interaction and Formation Mechanism of Sediment Longitudinal Streaky Structures in Rough Channel Flows

Journal of Hydraulic Engineering (2024)

Hao Wang Xiangju Kong Qiang Zhong Feng Yang Chendi Zhang

Hyperconcentrated flow

10.1061/jhend8.hyeng-13984

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Dataset of "Hybrid modeling on 3D hydraulic features of a step-pool unit"

Zenodo (CERN European Organization for Nuclear Research) (2022)

Chendi Zhang

In this repository you can find the data for the submission "Hybrid modeling on 3D hydraulic features of a step-pool unit" by Zhang et al. to Earth Surface Dynamics. The topographic models of the step-pool unit made of natural stones after FAVORization in FLOW3D for the six flow rates are kept in .stl files which were named after the flow rates (L/s). The mesh size for the step-pool feature is 2.5 mm for X, Y and Z directions. The locations, water level and flow velocity for the inlet boundary in all the numerical models are presented in the excel file.

10.5281/zenodo.5840752

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Spatio-temporal distribution of Gymnocypris przewalskii during migration with UAV-based photogrammetry and deep neural network

Journal of Ecohydraulics (2021)

Chendi Zhang Mengzhen Xu Fakai Lei Jiahao Zhang Giri Kattel

The naked carp (Gymnocypris przewalskii) plays a central role in the ecosystem of the Qinghai Lake, the largest saline-alkaline lake in China. The adult naked carp migrates in large groups with high population density annually from the Qinghai Lake to the upstream freshwater rivers to spawn. Nevertheless, the responsiveness of the fish to local abiotic cues in the form of distribution patterns during migration across the riverine-lacustrine network of the Qinghai Lake region remains unknown. This knowledge gap has reduced efficiency in fish conservation and management efforts in the region. To address this issue, we carried out two field surveys from June to August, 2018, with the aid of unmanned aerial vehicles to a 200-m long back channel characterizing diverse morphological and hydraulic features on the migration route. Combined structure from motion photogrammetry and deep neural network techniques were used to establish a new workflow for detecting and extracting the profiles of fish individuals in large schools. The spatio-temporal distribution pattern of the fish demonstrated that the naked carp was attracted by hydraulic environments with high flow velocity or deep-water during migration. The diurnal variation of temperature and light could alter the preference for hydraulic environments of the fish. Our results highlight the crucial role of the interactions between river morphology and hydraulics, water temperature and light on the migration behaviours of the naked carp.

Spawn (biology)

Fresh water fish

10.1080/24705357.2021.1892547

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Citations (13)

Modeling and analysis of effects of precipitation and vegetation coverage on runoff and sediment yield in Jinsha River Basin

DOAJ (DOAJ: Directory of Open Access Journals) (2013)

Jun Du Changxing Shi Chendi Zhang

This paper focuses on the effects of precipitation and vegetation coverage on runoff and sediment yield in the Jinsha River Basin. Results of regression analysis were taken as input variables to investigate the applicability of the adaptive network-based fuzzy inference system (ANFIS) to simulating annual runoff and sediment yield. Correlation analysis indicates that runoff and sediment yield are positively correlated with the precipitation indices, while negatively correlated with the vegetation indices. Furthermore, the results of stepwise regression show that annual precipitation is the most important factor influencing the variation of runoff, followed by forest coverage, and their contributions to the variation of runoff are 69.8% and 17.3%, respectively. For sediment yield, rainfall erosivity is the most important factor, followed by forest coverage, and their contributions to the variation of sediment yield are 49.3% and 24.2%, respectively. The ANFIS model is of high precision in runoff forecasting, with a relative error of less than 5%, but of poor precision in sediment yield forecasting, indicating that precipitation and vegetation coverage can explain only part of the variation of sediment yield, and that other impact factors, such as human activities, should be sufficiently considered as well.

10.3882/j.issn.1674-2370.2013.01.004

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Citations (30)

Comment on esurf-2022-5

Chendi Zhang

Abstract. Step-pool systems are common bedforms in mountain streams and have been utilized in river restoration projects around the world. Step-pool units exhibit highly nonuniform hydraulic characteristics which have been reported to closely interact with the morphological evolution and stability of step-pool features. However, detailed information on the three-dimensional hydraulics for step-pool morphology has been scarce due to the difficulty of measurement. To fill in this knowledge gap, we established a combined approach based on the technologies of structure from motion (SfM) and computational fluid dynamics (CFD). 3DÂ reconstructions of bed surfaces with an artificial step-pool unit built from natural stones at six flow rates were imported to CFD simulations. The combined approach succeeded in visualizing the high-resolution 3DÂ flow structures for the step-pool unit. The results illustrate the segmentation of flow velocity downstream of the step, i.e., the integral recirculation cell at the water surface, streamwise vortices formed at the step toe, and high-speed flow in between. The highly nonuniform distribution of turbulence energy in the pool has been revealed, and two energy dissipaters of comparable magnitude are found to co-exist in the pool. Pool scour development during flow increase leads to the expansion of recirculation cells in the pool, but this expansion stops for the cell near the water surface when flow approaches the critical value for step-pool failure. The micro-bedforms (grain clusters) developed on the negative slope affect the local hydraulics significantly, but this influence is suppressed at the pool bottom. The drag forces on the step stones increase with discharge (before the highest flow value is reached). In comparison, the lift force consistently has a larger magnitude and a more widely varying range. Our results highlight the feasibility and great potential of the approach combining physical and numerical modeling in investigating the complex flow characteristics of step-pool morphology.

Hydraulics

Bedform

Flow conditions

10.5194/esurf-2022-5-ac1

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Effects on Slope Stability of the Yarlung Tsangbu Grand Canyon under Future Hydropower Development

Zhiwei Li Zhaoyin Wang Yu Guoan Wang Xu-zhao Chendi Zhang

Grand Challenges

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