scholarly journals Approach to Mitigation of Territory Inundation with Help of Flood Control by Small Water Reservoirs

10.29007/hjpt ◽  
2018 ◽  
Author(s):  
Vitaly Ilinich ◽  
Aleksey Perminov ◽  
Olga Rukhovich ◽  
Anna Naumova
Keyword(s):  
River Basin ◽  
Flood Control ◽  
Water Reservoir ◽  
River System ◽  
Flood Mitigation ◽  
Water Reservoirs ◽  
Hydraulic Flow ◽  
Small Water ◽  
Flow Capacity ◽  
Flood Hydrograph

The research dedicated to modeling of flood mitigation on the river basin with help of simulation of flood control by virtual small water reservoirs located in different places of the river system. Such problem decided with help of modeling of flood hydrograph and its routing through water reservoir on the base GIS. Reducing the degree of flooding should occur due to the limited hydraulic flow capacity of the water flow by dam spillways without flood control by people. The offered model is represented on the example of concrete river basin. Results have showed relevance of the model for flood mitigation on the river basin.

scholarly journals Model Studies on the Effectiveness of MBBR Reactors for the Restoration of Small Water Reservoirs

2018 ◽  
Vol 30 ◽  
pp. 02004
Author(s):  
Agata Nowak ◽  
Robert Mazur ◽  
Ewa Panek ◽  
Joanna Chmist
Keyword(s):  
Wastewater Treatment ◽  
Treatment Effectiveness ◽  
Operation Mode ◽  
Water Reservoir ◽  
Biofilm Reactor ◽  
Treated Wastewater ◽  
Polluted Water ◽  
Water Reservoirs ◽  
Wastewater Treatment Process ◽  
Small Water

The authors present the Moving Bed Biofilm Reactor (MBBR) model with a quasi-continuous flow for small water reservoir restoration, characterized by high concentrations of organic pollutants. To determine the efficiency of wastewater treatment the laboratory analysis of physic-chemical parameters were conducted for the model on a semi-technical scale of 1:3. Wastewater treatment process was carried out in 24 h for 1 m3 for raw sewage. The startup period was 2 weeks for all biofilters (biological beds). Approximately 50% reduction in COD and BOD5 was obtained on average for the studied bioreactors. Significant improvements were achieved in theclarity of the treated wastewater, with the reduction of suspension by 60%. The oxygen profile has improved significantly in 7 to 9 hours of the process, and a diametric reduction in the oxidative reduction potential was recorded. A preliminary model of biological treatment effectiveness was determined based on the conducted studies. In final stages, the operation mode was set in real conditions of polluted water reservoirs.

scholarly journals Flood Transformation Effect of a System of Small Water Reservoirs

2015 ◽  
Vol 63 (5) ◽  
pp. 1581-1586
Author(s):  
Václav Tlapák ◽  
Petr Pelikán ◽  
Pavla Pilařová
Keyword(s):  
Work Experience ◽  
Water Discharge ◽  
Retention Volume ◽  
Water Reservoir ◽  
Water Reservoirs ◽  
The Czech Republic ◽  
Small Water ◽  
Proper Design ◽  
Retention Volumes

The paper resumes the investigation of transformation of watershed flow off caused by retention volumes of small water reservoirs (SWR) in landscape. Based on our work experience in the field of water reservoir design and research, we know that simple system of even small fishponds disposes of nonnegligible free retention volume. We decided to verify this assumption with aid of exact determination of discharge transformation within the basin containing realized system of small water reservoirs. The input water management data for design of water reservoirs are represented by water discharge in existing stream related to the point of designed SWR. In the Czech Republic, the data are provided by the Czech Hydrometeorological Institute (CHMI), however the data refer to an unaffected discharges, i.e. without consideration of transformation effects of existing small water reservoirs within the basin. Although the total available volume for transformation purposes of investigated SWR system is relatively small, the results show the transformation effect of such reservoirs is not insignificant. Furthermore the transformation effect is raised by proper design and functionality of the whole system of water reservoirs.

scholarly journals Monitoring Changes in the Morphology and Storage of a Small Water Reservoir: A Case Study from Vrbovce, Slovakia

2020 ◽  
Vol 28 (2) ◽  
pp. 30-35
Author(s):  
Roman Výleta ◽  
Peter Valent ◽  
Zuzana Danáčová
Keyword(s):  
Sedimentation Rate ◽  
Agricultural Land ◽  
Water Reservoir ◽  
Acoustic Doppler Current Profiler ◽  
Water Reservoirs ◽  
Simple Method ◽  
Small Water ◽  
Current State ◽  
Current Profiler

AbstractOne of the most profound problems in the operation of water reservoirs is their siltation by sediments coming from agricultural land. The siltation of water reservoirs can significantly shorten their life spans and prevent them from effectively fulfilling their functions. Therefore, accurate monitoring of the current state and dynamics of siltation processes is critical to maintaining their economic, environmental, and societal functions. This study presents a simple method to evaluate the sedimentation rate of a small water reservoir in Slovakia. The method is based on comparing the results from two bathymetric surveys that were carried out in 2017 and 2019 using an ultrasonic acoustic doppler current profiler (ADCP), which was originally developed to measure river discharges. A raster map of the thickness of the sediment in the reservoir was assembled by subtracting the two bathymetric surveys from each other. The analysis of the results showed that the mean annual sedimentation rate of the reservoir is only 101 m3/year, representing a mean increment in sediment thickness of 1.4 cm. The method described showed promising results and could be applied to numerous small water reservoirs of a similar size across Slovakia.

scholarly journals The application of environmental governance for sustainable watershed-based management

2021 ◽  
Author(s):  
Seiichi Kagaya ◽  
Tetsuya Wada
Keyword(s):  
Environmental Protection ◽  
River Basin ◽  
Watershed Management ◽  
Water Use ◽  
Flood Control ◽  
Environmental Governance ◽  
Planning Process ◽  
Environment Assessment ◽  
Control Water

AbstractIn recent years, it has become popular for some of countries and regions to adapt the system of governance to varied and complex issues concerned with regional development and the environment. Watershed management is possibly the best example of this. It involves flood control, water use management and river environment simultaneously. Therefore, comprehensive watershed-based management should be aimed at balancing those aims. The objectives of this study are to introduce the notion of environmental governance into the planning process, to establish a method for assessing the alternatives and to develop a procedure for determining the most appropriate plan for environmental governance. The planning process here is based on strategic environment assessment (SEA). To verify the hypothetical approach, the middle river basin in the Tokachi River, Japan was selected as a case study. In practice, after workshop discussions, it was found to have the appropriate degree of consensus based on the balance of flood control and environmental protection in the watershed.

scholarly journals The Impacts of Hydropower Dams in the Mekong River Basin: A Review

Water ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 265
Author(s):  
Akarath Soukhaphon ◽  
Ian G. Baird ◽  
Zeb S. Hogan
Keyword(s):  
River Basin ◽  
River System ◽  
Economic Security ◽  
Mekong River ◽  
Aquatic Biodiversity ◽  
Environmental Impact Assessments ◽  
The Social ◽  
Hydropower Dams ◽  
River Hydrology ◽  
Riparian Communities

The Mekong River, well known for its aquatic biodiversity, is important to the social, physical, and economic health of millions living in China, Myanmar, Laos, Thailand, Cambodia, and Vietnam. This paper explores the social and environmental impacts of several Mekong basin hydropower dams and groupings of dams and the geographies of their impacts. Specifically, we examined the 3S (Sesan, Sekong Srepok) river system in northeastern Cambodia, the Central Highlands of Vietnam, and southern Laos; the Khone Falls area in southern Laos; the lower Mun River Basin in northeastern Thailand; and the upper Mekong River in Yunnan Province, China, northeastern Myanmar, northern Laos, and northern Thailand. Evidence shows that these dams and groupings of dams are affecting fish migrations, river hydrology, and sediment transfers. Such changes are negatively impacting riparian communities up to 1000 km away. Because many communities depend on the river and its resources for their food and livelihood, changes to the river have impacted, and will continue to negatively impact, food and economic security. While social and environmental impact assessments have been carried out for these projects, greater consideration of the scale and cumulative impacts of dams is necessary.

Impacts of urbanization on river system structure: a case study on Qinhuai River Basin, Yangtze River Delta

2014 ◽  
Vol 70 (4) ◽  
pp. 671-677 ◽  
Author(s):  
Xiaomin Ji ◽  
Youpeng Xu ◽  
Longfei Han ◽  
Liu Yang
Keyword(s):  
River Basin ◽  
River System ◽  
Yangtze River Delta ◽  
System Structure ◽  
River Channels ◽  
Stream Structure ◽  
Impervious Area ◽  
The Status ◽  
Urbanized Areas ◽  
Qinhuai River

Stream structure is usually dominated by various human activities over a short term. An analysis of variation in stream structure from 1979 to 2009 in the Qinhuai River Basin, China, was performed based on remote sensing images and topographic maps by using ArcGIS. A series of river parameters derived from river geomorphology are listed to describe the status of river structure in the past and present. Results showed that urbanization caused a huge increase in the impervious area. The number of rivers in the study area has decreased and length of rivers has shortened. Over the 30 years, there was a 41.03% decrease in river length. Complexity and stability of streams have also changed and consequently the storage capacities of river channels in intensively urbanized areas are much lower than in moderately urbanized areas, indicating a greater risk of floods. Therefore, more attention should be paid to the urban disturbance to rivers.

scholarly journals Comparative Assessment of Different Modelling Schemes and Their Applicability to Inland Small Reservoirs: A Central Europe Case Study

2020 ◽  
Vol 12 (24) ◽  
pp. 10692
Author(s):  
Petr Pelikán ◽  
Věra Hubačíková ◽  
Tatiana Kaletová ◽  
Jakub Fuska
Keyword(s):  
Wind Speed ◽  
Landscape Management ◽  
Water Reservoir ◽  
Shore Protection ◽  
Good Opportunity ◽  
Small Water ◽  
Design Wind Speed ◽  
Run Up ◽  
American Society ◽  
Sustainable Landscape Management

Sustainable landscape management involve also water reservoir management. The demand of their reconstruction represents a good opportunity for redesigning hydrotechnical structures and their parameters using recent methods and models. The estimation of wind-driven waves on small water reservoirs and their effects on water reservoir structures rarely are applied, although it is an important part of the dam height calculation. The analysis of wave run-up on the upstream face of the dam was performed by means of the Slovak Technical Standard (STN), Coastal Engineering Manual (CEM), Shore Protection Manual (SPM) and model designed by American Society of Agricultural and Biological Engineers (ASABE). The estimations of the wave characteristics differ depending on the model; wave height (H13%) within the range 0.32–0.56 m, wave period 1.32–2.11 s and run-up (R2%) 0.84–1.68 m under conditions of design wind speed 25 m·s−1. Results obtained by CEM, SPM models predict lower values than STN and ASABE models. Since the height difference between the dam crest and still water level in the reservoir is only 0.90 m, we can expect overtopping of the crest by waves after the critical wind speed is exceeded.

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