SETTLEMENTS IN THE RUCĂR – BRAN CORRIDOR. DYNAMICS OF FUNCTIONAL TYPES by LUCIAN DAVID

“…The favourable natural setting, the varied topography, the soil cover, the wealth of vegetal species, the well-developed river system etc., correlated with the existence of extensive pastures and hayfields have encouraged the development of a pastoral civilization in the Rucăr – Bran Corridor, which is well known both at home and abroad.…”
Get full text

Research and Application of Visualization Technology of Water Diversion in Hanjiang-Rongjiang-Lianjiang River Water System Connectivity Project by LI Jiasheng, CHEN Longzan, LI Jin, JIANG Yutian, XUE Xiaopeng

“…On the basis of the Hanjiang-Rongjiang-Lianjiang river connectivity project,through the research on the flow data processing and the flow evolution display technology,this paper creatively proposes the flow data processing with data cleaning,standard storage and structured organization as the main contents,and determines the display technology of various elements according to the different classification of the flow elements,and finally visually displays the water level and flow velocity in combination with water diversion examples.The research shows that the visualization technology of the dynamic evolution of Hanjiang-Rongjiang-Lianjiang river is fast in rendering and rich in visual content,which provides good support for the connectivity effect and decision evaluation of the Hanjiang-Rongjiang-Lianjiang river system.…”
Get full text

Identification of Manning’s Coefficient Using HEC-RAS Model: Upstream Al-Amarah Barrage by Sarmad A. Abbas, Ali H. Al-Aboodi, Husham T. Ibrahim

“…In understanding the hydraulic characteristics of river system flow, the hydraulic simulation models are essential tools. …”
Get full text

Proposed Methods and Endpoints for Defining and Assessing Adverse Environmental Impact (AEI) on Fish Communities/Populations in Tennessee River Reservoirs by Gary D. Hickman, Mary L. Brown

Get full text

Ecological Flow of Intensively Developed and Utilized Rivers in Yunnan Province Based on Improved Tennant Method by LI Jiao, LI Xuehui

“…The ecological flow of rivers is the basic element for maintaining a river ecosystem and an important indicator for controlling the intensity of water resource development and utilization.Studying ecological flow is a significant part of endorsing river health.According to the characteristics of the intensively developed and utilized rivers in Yunnan Province,this paper takes the Niulan River system in the Jinsha River Basin as a representative to carry out ecological flow research.It proposes an improved Tennant method according to the division of the river's “water use period”,“flood control period”,and “water storage period” and compares it with three common hydrological methods.According to the comparison,the proposed improved Tennant method has obvious advantages in meeting the water use characteristics of rivers in development and utilization,the variation law of natural rivers' abundance and dryness throughout the year,the ecological environment conditions in the river course,and the ecological flow satisfaction rate in dry seasons.…”
Get full text

Application of a DEM-based Distributed Rainfall-Runoff Model Considering Karst Landform in the Xijiang River Basin by CHEN Shilei, XIONG Lihua, ZHA Xini, SHU Peng

“…Based on the hydrologicalcharacteristics and variability of karst landform, this paper improves a DEM-based distributedrainfall-runoff model (DDRM) for karst basins by considering the effects of epi-karst zone on waterstorage capacity and underground river system on runoff yield, and applies both the original andimproved DDRM in the Xijiang River Basin to simulate the daily runoff at the Wuzhou Station duringthe period of 2010 to 2016. …”
Get full text

Application of HEC-HMS Model in Flood Simulation of Qingshan River Basin by PENG Chujie

“…It is more and more important to realize the fast simulation of flood process in the early warning of mountain flood disaster in small and medium river basins.This paper builds a distributed hydrological model for Qingshan River Basin by combining HEC-HMS model with GIS technology,extracts the characteristics of river system and conducts gridding on small basin based on DEM data,calculates the surface runoff by initial and constant loss method and Snyder unit hydrograph method,simulates the process of base flow recession through nonlinear boussinesq method,conducts the channel routing by Muskingum method,calibrates the parameters with the past 5 measured flood data,as well as verifies the prediction results by 13 floods.The simulation results show that during the verification period,the errors of peak discharge are all within 20%,the time difference for peaks is less than 3 h,the certainty coefficient is less than 0.7 for only 2 floods,and above 0.7 for others.The results show that with high accuracy and stability,the HEC-HMS model for flood simulation in this river basin conforms to the requirements of the flood forecast,which is of great application value for the exploration of small basin flood simulation and analysis.…”
Get full text

Study on Flood Simulation and Its Real-time Correction of Qinhuai River Basin Based on Grid-Xin'anjiang Model by SUN Wenyu, WANG Rong, YAO Cheng, HE Jian, LI Zhijia, GONG Junfu, HUANG Pengnian

“…There are many small and medium-sized rivers in China,with frequent floods and serious disasters,which are the key weak links in flood prevention and control.Qinhuai River system is one of the most important water bodies in Nanjing,and the possible flood disaster in the flood season poses a threat to the life and property safety in the whole city.Taking Qianhan Village in Qinhuai River basin as the research object,this paper conducts the flood simulation through the Xin'anjiang model and Grid-Xin'anjiang model,and corrects it in real time by the KNN method and feedback method,so as to realize fast and accurate flood forecasting calculation.The results show that without real-time correction,the simulation accuracy of the Grid-Xin'anjiang model is slightly better than that of the Xin'anjiang model,and the simulation results of the two models are generally good.After real-time correction,the simulation results of the Xin'anjiang model and the Grid-Xin'anjiang model are improved obviously,which can provide an important basis for the decision of flood control and disaster reduction in the Qinhuai River Basin.…”
Get full text

Simulation Analysis of Salt Diffusion at Wanquan River Estuary under Changing Environment by HAILAI Yibo, SHI Haoran, LIU Xiaoqing, LIU Jiao, FANG Mingyi, ZHANG Lanyue

“…The diffusion of offshore salt in inland rivers along with tidal waves has an important effect on the aquatic ecological environment of the estuary area.This paper,taking the Wanquan River Estuary as an example,used the Mike21 model to simulate the salinity distribution along the channel under different runoff and tidal levels and analyzed the change rules and leading factors.The results show that the river system and riverbed topography at the Wanquan River Estuary reduce the upward diffusion of salt propelled by the tide and that the salt is mainly distributed in the waters near the estuary.The salinity distribution along the upper reaches of the river decreases rapidly,and it basically remains unchanged when the tidal level increases by 0.1 m and 0.3 m,respectively.A sudden increase in salinity occurs where a curved or narrow channel changes the local water flow and salt accumulates.The upward diffusion range of salt is mainly affected by runoff. …”
Get full text

Application of Distributed Hydrological Model Based on NRIHM in Humid Watershed by XU Qin, LIU Lulin, LONG Jie, JIN Chen, CAI Jing, LIN Xiaoqing, ZHANG Kun

“…The application was carried out in the catchment area above the Shaheji Reservoir in the Chuhe River system of the Yangtze River. The average deterministic coefficients of the calibration period and the verification period were 0.80 and 0.86, respectively. …”
Get full text

Study on Ecological Security Assessment of Dongjiang River Basin in Jiangxi Province Based on PSFR Model by LIU Huili, ZHA Dongping, FENG Minglei, WAN Ying

“…In order to find out the ecological security situation of Dongjiang River Basin in Jiangxi Province,and formulate targeted ecological protection measures for protecting the clear water of the Dongjiang River,this paper determines the weight of indexes through the “Pressure-State-Function-Risk”(PSFR) model and analytic hierarchy process (AHP),establishes and optimizes the ecological security assessment system of Dongjiang River Basin in Jiangxi Province,and combines with “3S” technology and expert support system to evaluate the ecological security of Dongjiang River Basin in Jiangxi Province.The results show that:The ecological security index (ESI) of Dongjiang River Basin is 74.80,and the ecological security state of the Dongjiang River Basin is relatively safe.The main environmental problems in the river basin are the disconnection of the river system,the failure of the water environment quality to reach the standard,the reduction of the aquatic biological resources and diversity,etc.The severe human activities,the high density of hydraulic structures,the potential pollution of mining and orchard development,the degradation of important habitat area,the degradation of wetland area and the weakening of watershed ecological service function are the causes.On the basis of the assessment,the main factors affecting the ecological security of the river basin are put forward in this paper,which provides technical basis for the formulation of the next protection plan,and the index system has a strong reference significance to the fine management of ecological risk control in other basins.…”
Get full text

Composition and Water Ecology Indication of Functional Feeding Groups of Zoobenthos in Liuxi River by CHEN Ci, ZHU Kunpeng, LIU Yue, LI Jiaxu, TAN Ying, WANG Lu

“…The Liuxi River is the most important river system in Guangzhou,and systematic monitoring and assessment provide basic information for the health management of the Liuxi River ecosystem.Field in-situ sampling of zoobenthos in the Liuxi River was conducted during the dry (March) and wet (September) seasons in 2019 to explore the spatio-temporal distribution characteristics of functional feeding groups (FFGs) of zoobenthos,and the habitat conditions of the Liuxi River were assessed by the composition of the zoobenthos FFGs.The results show that the main group of zoobenthos in the Liuxi River Basin is collectors,followed by scrapers and predators,whereas filterers and shredders are rarely observed.The dominant groups at the sampling sites in the upper and middle reaches are moderate pollution tolerant collectors (Baetidae and Corbiculidae) and pollution tolerant collectors (Chironomidae),while the sampling sites in the lower reaches are overwhelmingly dominated by pollution tolerant collectors (Chironomidae).Environmental factors significantly affect the distribution of zoobenthos FFGs.Specifically,the key environmental factors in the dry season are velocity and NO₃,while those in the wet season are SiO₂ and velocity.The attributes of the Liuxi River ecosystem were analyzed on the basis of the composition of the zoobenthos FFGs.The results indicate that the ecosystems at most of the sampling sites in the Liuxi River are heterotrophic ones,and the riparian zone of this basin is not healthy.The longitudinal transport ability of the river is mostly in an unhealthy state.Predators' control effect is normal except at some sampling sites in the upper reaches.The basin maintains favorable habitat stability except at the sampling sites affected by sand dredging.…”
Get full text

Analysis on the Variation Characteristics of Rainstorm and Cause of Flood in Central Yunnan — Take Downtown of Yuxi City as an Example by ZHU Wenxiang

“…Taking the downtown of Yuxi as an example,based on the maximum 1h and 24h rainstorm data of Dongfeng station from 1981 to 2019,this paper studies the variation characteristics of short-duration rainstorm in central Yunnan by the linear moving average,Mann-Kendall test and Hurst index,analyzes the causes of urban flood and puts forward countermeasures and suggestions.The results show that:The annual maximum 1 h and 24 h precipitation in downtown of Yuxi presented an insignificant fluctuation and rising trend,with the change rate of 1.4 mm/10a and 0.6 mm/10a respectively.The Hurst index of maximum 1 h and 24 h precipitation over the years is 0.57 and 0.56 respectively,which is consistent with the trend of future changes and relatively weak in continuity.The maximum 1 h precipitation sequence of the Dongfeng station changed suddenly in 1987,2002,2007 and 2013,while the maximum 24 h precipitation sequence changed suddenly in 2000,2009 and 2013.The annual maximum 1 h and 24 h precipitation mostly occurred in August and June,with a high concentration of rainstorm.The average P_1h/P_24h of the same rainstorm was 47.2%,and the largest proportion was 71.4%.Based on the causes of flood,it is suggested to regulate the river system,improve the pipe network,build new rain and sewage pipe network,construct the sponge city at all areas,and establish a scientific hydrological monitoring system and prediction and early warning platform for urban flood control and drainage.…”
Get full text

A human geography analysis of the evolution of the urban morphology of ancient Foshan city from the perspective of Cantonese trading culture by Shaobin Wang, Ye Hou, Weihui Zhang, Cheng Liao, Rongyi Wang

“…This shift reflects a transformation in the river system structure from a natural to a more systematic, intertwined, and artificial state. …”
Get full text

Influence of Water System Connectivity Project on Hydrodynamics of Offshore Tidal Waters by WANG Yifei, WANG Yanhong, YANG Xiaoyu, JIAO Jian, DING Lei

“…In this study, a two-dimensional hydrodynamic mathematical model was used to simulate the hydrodynamic conditions in the Longjiang Pond before and after the construction of the Longjiang River System Connectivity Project. The results show that the water flow velocity in most areas before and after the construction of the project is smaller than 2 cm/s, and the water flow velocity in some areas with poor water exchange capacity is smaller than 0.5 cm/s. …”
Get full text

Investigation of morphology changes in Karun River and its hazards (Case Study: Bandagir to Khorramshahr) by Amir Saffati, EzatAllah ghanavati, Hamid Alipour Dezdouli Asl

“…Studying the morphology of the rivers and identifying the causes of these changes are widely useful in determining the evolution of rivers and planning the maintenance of the river system. The Karun River, between Bandar-e-Khoramshahr and the constant flow of water in the country, plays an important role in the country's water cycle. …”
Get full text

Influence of Water System Connectivity Project on Hydrodynamics of Offshore Tidal Waters by WANG Yifei, WANG Yanhong, YANG Xiaoyu, JIAO Jian, DING Lei

“…In this study, a two-dimensional hydrodynamic mathematical model was used to simulate the hydrodynamic conditions in the Longjiang Pond before and after the construction of the Longjiang River System Connectivity Project. The results show that the water flow velocity in most areas before and after the construction of the project is smaller than 2 cm/s, and the water flow velocity in some areas with poor water exchange capacity is smaller than 0.5 cm/s. …”
Get full text

Correlation analysis of daily water levels in rivers of the Kaliningrad region based on observation results in 2008–2021 by V. A. Naumov, N. R. Ahmedova

“…The dependence of pair correlation coefficients of daily water levels in two stations located in the same river system (The Angrapa River – Berestovo gauging station – The Pregolya River – Gvardeysk gauging station) and for different river systems (The Mamonovka River – Mamonovo gauging station – The Pregolya River – Chernyakhovsk gauging station) was determined.Conclusions. …”
Get full text

Uncertainty analysis in river quality management considering failure probability: controllable and uncontrollable input pollutants by Mohsen Dehghani Darmian, Britta Schmalz

“…Combining numerical methods with reliability analysis and soft computing techniques, this research provides valuable insights into river system dynamics and protecting river water quality.…”
Get full text

Multifaceted taxonomy of two Dactylogyrus species on Enteromius paludinosus: Integrating light microscopy, scanning electron microscopy and molecular approaches by Maduenyane Mpho, Dos Santos Quinton Marco, Avenant-Oldewage Annemariè

“…Dactylogyrus teresae Mashego, 1983 and Dactylogyrus dominici Mashego, 1983 were collected from E. paludinosus in the Vaal River system, Gauteng, South Africa and their taxonomic data revised using standard protocols and modern approaches, alongside the type material. …”
Get full text