scholarly journals Dynamic Water Balance Modelling for Risk Assessment and Decision Support on MAR Potential in Botswana

Water ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 721 ◽  
Author(s):  
Andreas Lindhe ◽  
Lars Rosén ◽  
Per-Olof Johansson ◽  
Tommy Norberg
Keyword(s):  
Water Supply ◽  
Large Scale ◽  
Original System ◽  
Integrated Approach ◽  
Water Shortage ◽  
Mitigation Measures ◽  
Security Model ◽  
Aquifer Recharge ◽  
Study Results ◽  
System Properties

Botswana experiences a water stressed situation due to the climate and a continuously increasing water demand. Managed Aquifer Recharge (MAR) is considered, among other measures, to improve the situation. To evaluate the possibility for increased water supply security, a probabilistic and dynamic water supply security model was developed. Statistically generated time series of source water availability are used in combination with the dynamic storages in dams and aquifers, and the possible supply is compared with the demand to simulate the magnitude and probability of water supply shortages. The model simulates the system and possible mitigation measures from 2013 to 2035 (23 years), using one-month time steps. The original system is not able to meet the demand, and the estimated volumetric supply reliability in the year 2035 is 0.51. An additional surface water dam (now implemented) will increase the reliability to 0.88 but there will still be a significant water shortage problem. Implementing large-scale MAR can further improve the reliability to at least 0.95. System properties limiting the effect of MAR are identified using the model and show how to further improve the effect of MAR. The case study results illustrate the importance and benefit of using an integrated approach, including time-dependence and future scenarios, when evaluating the need and potential of MAR.

Transferring Simulation of Pollutants in YinLuan River Open Channel under Traffic Accidents

2013 ◽  
Vol 385-386 ◽  
pp. 429-432 ◽  
Author(s):  
Chun Xue Zhang ◽  
Li Lin Wang ◽  
Chao Wang ◽  
Shu Yi Yang ◽  
Xue Yi You
Keyword(s):  
Water Supply ◽  
Large Scale ◽  
Traffic Accidents ◽  
Open Channel ◽  
Water Shortage ◽  
Scientific Basis ◽  
Decision Makers ◽  
Water Diversion ◽  
Tianjin City ◽  
Efdc Model

The water diversion project from Luanhe River to Tianjin is a large-scale project, which solved the water shortage of Tianjin city. Because the long water supply open channel along highroads, the traffic emergent incidents bring great potential dangers to the water supply of Tianjin. In this paper, the prediction model of traffic emergent incidents in YinLuan River Open Channel was built and the transferring of pollutants under typical scenes was simulated by EFDC model. The evolution and affective area of pollutant in open channel was obtained. The results provide a scientific basis for the decision makers to take effective measures.

scholarly journals Managed Aquifer Recharge suitability mapping combined with field examination and numerical simulation in the Danube-Tisza Interfluve, Hungary

2020 ◽  
Author(s):  
Zsóka Szabó ◽  
Márk Szijártó ◽  
Marco Masetti ◽  
Daniele Pedretti ◽  
Ferenc Visnovitz ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Large Scale ◽  
Unsaturated Flow ◽  
Water Shortage ◽  
Managed Aquifer Recharge ◽  
Local Scale ◽  
Water Levels ◽  
Danube River ◽  
Aquifer Recharge ◽  
Horizon 2020

<p>The Danube-Tisza Interfluve is one of the largest areas covered by wind-blown sand in Hungary. Two major morphologic region types are the flat-bottomed valleys of the Danube and Tisza rivers and a central elevated ridge region, characterized by sand plains, dunes and deflationary depressions. The area is poor in surface waters, mainly artificial channels can be found. Previously many lakes were present, but most of them dried out due to water abstraction, climate change, forestation and canalization related water level reduction. Water management problems in the broader area have been known for decades, many plans have been made to address water scarcity, but none have materialized (Kovács et al. 2017). These plans usually tried to solve water shortage with large scale engineering solutions, e.g. to pump water up from the Danube River Valley through surface channels to the ridge region (Nagy et al. 2016). This is very expensive, influences the ecological pattern, moreover water can easily infiltrate from the channels and would not reach the higher regions in the required amount (Silva Cisneros, 2019).<br>The aim of the research was to examine the suitability of Managed Aquifer Recharge methods, then a local scale field research was carried out in order to find local scale solutions. Finally the results were checked by numerical simulation to contribute to the solution of water shortage of this ecologically important area.<br>Firstly, a MAR surface infiltration suitability map was constructed, that shows areas with favorable hydraulic conductivity at the upper 10 m and low water levels, which means that there is a reservoir in the unsaturated zone to store infiltrated water. Based on suitability mapping, a local research area was selected which showed promising potential. Geophysical measurements (ERT – Electrical Resistivity Tomography, RMT – Radio-magnetotellurics) were performed, shallow wells were surveyed, and additional wells were drilled by hand driller. The results obtained during the field sampling contributed to the preliminary characterization of the area from a geological and hydrogeological point of view. In order to understand the effects of artificial channels and the possible water recharge methods a saturated-unsaturated flow model and different scenario models were built up in 2D.<br>This local scale case study was a first step towards the further aim of this research, which is to understand the effects of man-made changes on groundwater flow systems in the broader area and suggest appropriate local scale MAR solutions accordingly.</p><p>This research is part of a project that has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No 810980.</p><p><strong>Kovács, A. D., Hoyk, E., Farkas, J. Z. (2017).</strong> Homokhátság–A semi-arid region facing with complex problems in the Carpathian Basin. <em>European Countryside, 9</em>(1), 29-50.<br><strong>Nagy, I., Tombácz, E., László, T., Magyar, E., Mészáros, Sz., Puskás, E., Scheer, M. (2016). </strong>Vízvisszatartási mintaprojektek a Homokhátságon: „Nyugati és Keleti” mintaterületek. <em>Hidrológiai Közlöny, 96</em>(4), 42-60.<br><strong>Silva Cisneros, C. (2019). </strong>Identification of suitable zones of Managed Aquifer Recharge (MAR) in Western area of Duna-Tisza Interfluve using Geographic Information System (GIS). <em>MSc thesis. Eötvös Loránd University,</em> 62.</p>

Simulation of Pollutant Transportation in Yinluan Open Channel under the Effects of Wind

2013 ◽  
Vol 419 ◽  
pp. 842-847 ◽  
Author(s):  
Chun Xue Zhang ◽  
Wei Liu ◽  
Li Lin Wang ◽  
Chao Wang ◽  
Shu Yi Yang ◽  
...  
Keyword(s):  
Water Supply ◽  
Wind Direction ◽  
Large Scale ◽  
Open Channel ◽  
Water Shortage ◽  
Water Diversion ◽  
Water Diversion Project ◽  
Tianjin City ◽  
Efdc Model ◽  
Large Scale Project

The water diversion project from Luanhe River to Tianjin is a large-scale project eliminating the water shortage of Tianjin city. Because the long water supply open channel along highroads, the traffic emergent incidents bring great potential dangers to the water supply of Tianjin. In this paper, the prediction model of traffic emergent incidents was built and the transportation of pollutants in Yinluan open channel with the effects of wind was simulated by EFDC model. The evolution and affective area of pollutant in Yinluan open channel was obtained. The results showed that the effects of wind on the transportation of pollutant in Yinluan open channel are strong when the wind direction is along the channel.

scholarly journals Research on Optimal Allocation of Water Resources Based on Large-Scale System Decomposition and Coordination Model

2021 ◽  
Author(s):  
Zhuoran Luo ◽  
Jiahong Liu ◽  
Weiwei Shao ◽  
Yongxiang Zhang ◽  
Ruitao Jia
Keyword(s):  
Water Resources ◽  
Water Supply ◽  
Large Scale ◽  
Optimal Allocation ◽  
Water Shortage ◽  
Water Diversion ◽  
Allocation Model ◽  
System Decomposition ◽  
Optimal Allocation Model ◽  
Wei River

The construction of water resources optimal allocation model is the premise and foundation of solving and evaluating the optimal allocation model of water resources. The allocation of water resources includes not only the simple allocation of water resources, but also the protection of water resources and the analysis of the relationship between water supply and demand. Aiming at the problem of water shortage in the receiving area of water diversion from Hanjiang River to Weihe River, the large-scale system decomposition and coordination algorithm is used to optimally allocate the water use departments of each district of the water diversion area from Han to Wei River in Shaanxi Province, and establish the water diversion project from Han to Wei River. Optimal allocation model of water resources in the water receiving area. The results show that: in the 2030 planning level, the water supply of key cities, Xixian new district, medium/small cities, and industrial parks were 153.57, 368.16, 632.04, and 208.68 million m3, respectively, and the corresponding water shortage rate was 2.8%, 5.6%, 8.4%, 11.2%. The water supply sequence has a lower water shortage rate than the previous one, and the water shortage rate of the domestic water sector in key cities is only 1.2%. From the water shortage situation of various water departments in 2030, it can basically meet the water shortage of water receiving objects and effectively improve the water shortage in water receiving areas.

"SAFER ISLAND CONCEPT" DEVELOPED AFTER THE 2004 INDIAN OCEAN TSUNAMI: A CASE STUDY OF MALDIVES

2010 ◽  
Vol 04 (02) ◽  
pp. 135-143 ◽  
Author(s):  
MAHMOOD RIYAZ ◽  
KYUNG-HO PARK
Keyword(s):  
Indian Ocean ◽  
Integrated Approach ◽  
Adaptation Strategy ◽  
Mitigation Measures ◽  
Indian Ocean Tsunami ◽  
2004 Indian Ocean Tsunami ◽  
Study Results ◽  
Island Communities ◽  
Elevation Model

This study deals with the "safer island concept" implemented for the reconstruction and rehabilitation works after the 26 December 2004 Indian Ocean Tsunami in the Maldives. The safer island concept has been developed as an important adaptation strategy for tsunamis as well as the sea-level rise due to climate change. Reconstruction work in Dhuvaafaru Island to rehabilitate the entire population of Kandholhudhoo Island of Raa atoll is chosen as a case study. The appropriateness of the functionality of the redesigned island to provide security and safety for the island communities is evaluated using the digital elevation model. The study results show that the design enhanced mitigation measures of the island might show some resilience for less frequent natural disasters such as smaller tsunamis, while the implementation of the concept may create greater vulnerability for more frequent disasters, such as flash floods and storms. An integrated approach with appropriate risk assessment of floods, storms, and other physical aspects of the island is recommended for the future development of the safer island concept.

Model Order Reduction of Transmission Line Model

2020 ◽  
Vol 19 ◽  
Keyword(s):  
Transmission Line ◽  
Large Scale ◽  
Original System ◽  
Reduced Order Model ◽  
Benchmark Problems ◽  
Transmission Line Model ◽  
Order Model ◽  
Line Model ◽  
Reduced Order ◽  
Numerical Effort

Transmission Line model are an important role in the electrical power supply. Modeling of such system remains a challenge for simulations are necessary for designing and controlling modern power systems.In order to analyze the numerical approach for a benchmark collection Comprehensive of some needful real-world examples, which can be utilized to evaluate and compare mathematical approaches for model reduction. The approach is based on retaining the dominant modes of the system and truncation comparatively the less significant once.as the reduced order model has been derived from retaining the dominate modes of the large-scale stable system, the reduction preserves the stability. The strong demerit of the many MOR methods is that, the steady state values of the reduced order model does not match with the higher order systems. This drawback has been try to eliminated through the Different MOR method using sssMOR tools. This makes it possible for a new assessment of the error system Offered that the Observability Gramian of the original system has as soon as been thought about, an H∞ and H2 error bound can be calculated with minimal numerical effort for any minimized model attributable to The reduced order model (ROM) of a large-scale dynamical system is essential to effortlessness the study of the system utilizing approximation Algorithms. The response evaluation is considered in terms of response constraints and graphical assessments. the application of Approximation methods is offered for arising ROM of the large-scale LTI systems which consist of benchmark problems. The time response of approximated system, assessed by the proposed method, is also shown which is excellent matching of the response of original system when compared to the response of other existing approaches .

Staying Ahead of the Obstacles: HRSD’s Path to Implementing Large Scale Managed Aquifer Recharge

2018 ◽  
Vol 2018 (9) ◽  
pp. 4635-4638
Author(s):  
Tyler Nading ◽  
Larry Schimmoller ◽  
Germano Salazar-Benites ◽  
Charles Bott ◽  
Jamie Mitchell ◽  
...  
Keyword(s):  
Large Scale ◽  
Managed Aquifer Recharge ◽  
Aquifer Recharge

DESIGN AND IMPLEMENTATION OF THE OCEANOGRAPHIC MODELING AND OBSERVATION NETWORK (REMO) FOR PHYSICAL OCEANOGRAPHY STUDIES AND OCEAN FORECASTING

2014 ◽  
Vol 31 (2) ◽  
Author(s):  
Jose Antonio Moreira Lima
Keyword(s):  
Atlantic Ocean ◽  
Large Scale ◽  
North Pacific Ocean ◽  
Integrated Approach ◽  
Sea Surface ◽  
Global Ocean ◽  
Height Anomaly ◽  
The North ◽  
Observation Network ◽  
Ocean Forecasting

This paper is concerned with the planning, implementation and some results of the Oceanographic Modeling and Observation Network, named REMO, for Brazilian regional waters. Ocean forecasting has been an important scientific issue over the last decade due to studies related to climate change as well as applications related to short-range oceanic forecasts. The South Atlantic Ocean has a deficit of oceanographic measurements when compared to other ocean basins such as the North Atlantic Ocean and the North Pacific Ocean. It is a challenge to design an ocean forecasting system for a region with poor observational coverage of in-situ data. Fortunately, most ocean forecasting systems heavily rely on the assimilation of surface fields such as sea surface height anomaly (SSHA) or sea surface temperature (SST), acquired by environmental satellites, that can accurately provide information that constrain major surface current systems and their mesoscale activity. An integrated approach is proposed here in which the large scale circulation in the Atlantic Ocean is modeled in a first step, and gradually nested into higher resolution regional models that are able to resolve important processes such as the Brazil Current and associated mesoscale variability, continental shelf waves, local and remote wind forcing, and others. This article presents the overall strategy to develop the models using a network of Brazilian institutions and their related expertise along with international collaboration. This work has some similarity with goals of the international project Global Ocean Data Assimilation Experiment OceanView (GODAE OceanView).

scholarly journals Environmental effects of tourism and its seasonality on Mediterranean islands: the contribution of the Interreg MED BLUEISLANDS project to build up an approach towards sustainable tourism

2020 ◽  
Author(s):  
Cristina Andolina ◽  
Geraldina Signa ◽  
Agostino Tomasello ◽  
Antonio Mazzola ◽  
Salvatrice Vizzini
Keyword(s):  
Sustainable Tourism ◽  
Integrated Approach ◽  
Mitigation Measures ◽  
Mediterranean Islands ◽  
Tourist Destination ◽  
Local Economies ◽  
Good Opportunity ◽  
Management Plans ◽  
Seawater Quality ◽  
Great Burden

Abstract The Mediterranean basin is amongst the world’s main tourist destination, and its islands are a major attraction, being sites of historical, cultural and naturalistic importance. This is beneficial for the local economies, but it may also represent a great burden on the coastal environment, where other human pressures are concentrated. The awareness of detrimental side effects of tourism together with the importance to take into account social and economic facets has led to the concept of sustainable tourism, which, however, represents a goal far from being attained. A good opportunity to promote sustainable tourism was provided by the Interreg MED BLUEISLANDS project, whose main aim was to identify, address and mitigate the effects of the seasonal variation of waste generated by tourism on Mediterranean islands. Here, we present the methodological framework of the project aimed at biomonitoring coastal seawater in highly touristic sites using macroalgae as valuable bioindicators of seawater quality and improving its status through the implementation and assessment of mitigation measures that included also the involvement of stakeholders. Outcomes of the project highlighted the effectiveness of such an integrated approach, confirming the importance of choosing proper indicators and tools that can support the development of management plans aiming to mitigate environmental impact and foster sustainable tourism.

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