scholarly journals How effective is river restoration in re-establishing groundwater–surface water interactions? – A case study

2015 ◽  
Vol 19 (6) ◽  
pp. 2663-2672 ◽  
Author(s):  
A.-M. Kurth ◽  
C. Weber ◽  
M. Schirmer
Keyword(s):  
Surface Water ◽  
River Restoration ◽  
Morphological Changes ◽  
Cost Effective ◽  
Urban Stream ◽  
Distributed Temperature Sensing ◽  
River Bed ◽  
Before And After ◽  
Restoration Measures

Abstract. In this study, we investigated whether river restoration was successful in re-establishing groundwater–surface water interactions in a degraded urban stream. Restoration measures included morphological changes to the river bed, such as the installation of gravel islands and spur dykes, as well as the planting of site-specific riparian vegetation. Standard distributed temperature sensing (DTS) and novel active and passive DTS approaches were employed to study groundwater–surface water interactions in two reference streams and an experimental reach of an urban stream before and after its restoration. Radon-222 analyses were utilized to validate the losing stream conditions of the urban stream in the experimental reach. Our results indicated that river restoration at the study site was indeed successful in increasing groundwater–surface water interactions. Increased surface water downwelling occurred locally at the tip of a gravel island created during river restoration. Hence, the installation of in-stream structures increased the vertical connectivity and thus groundwater–surface water interactions. With the methods presented in this publication, it would be possible to routinely investigate the success of river restorations in re-establishing vertical connectivity, thereby gaining insight into the effectiveness of specific restoration measures. This, in turn, would enable the optimization of future river restoration projects, rendering them more cost-effective and successful.

scholarly journals How effective is river restoration in re-establishing groundwater – surface water interactions? – A case study

2015 ◽  
Vol 12 (1) ◽  
pp. 1093-1118
Author(s):  
A.-M. Kurth ◽  
C. Weber ◽  
M. Schirmer
Keyword(s):  
Surface Water ◽  
River Restoration ◽  
Cost Effective ◽  
Urban Stream ◽  
Distributed Temperature Sensing ◽  
Before And After ◽  
Restoration Measures ◽  
Insight Into ◽  
Gaining Insight

Abstract. In this study we investigated whether river restoration was successful in re-establishing vertical connectivity and, thereby, groundwater-surface water interactions, in a degraded urban stream. Well-tried passive Distributed Temperature Sensing (DTS) and novel active and passive DTS approaches were employed to study groundwater-surface water interactions in an experimental reach of an urban stream before and after its restoration and in two (near-) natural reference streams. Results were validated with Radon-222 analyses. Our results indicated that river restoration at the study site was indeed successful in increasing groundwater-surface water interactions. Increased surface water downwelling occurred locally at the tip of a gravel island created during river restoration. Hence, the installation of in-stream structures increased the vertical connectivity and thus groundwater-surface water interactions. With the methods presented in this publication it would be possible to routinely investigate the success of river restorations in re-establishing vertical connectivity, thereby gaining insight into the effectiveness of specific restoration measures. This, in turn, would enable the optimization of future river restoration projects, rendering them more cost-effective and successful.

scholarly journals An assessment of effectiveness of participatory video and drama in enhancing learning of “climate-smart” push-pull technology: a case study of butere and vihiga farmers in western Kenya

2018 ◽  
Vol 6 (2) ◽  
pp. 109-115
Author(s):  
Wakesho George ◽  
Pittchar Jimmy ◽  
Midega Charles ◽  
Khan Zeyaur
Keyword(s):  
Data Collection ◽  
Level Set ◽  
A Priori ◽  
Cost Effective ◽  
Chi Square ◽  
Western Kenya ◽  
Participatory Video ◽  
Validated Questionnaires ◽  
Before And After

This study assessed the effectiveness of participatory video and drama in enhancing learning of climate-smart push-pull technology in western Kenya. A total of 80 farmers who had no knowledge of push pull technology were exposed to participatory drama and video that had been developed by farmers who are adopting push pull technology. Validated questionnaires were used for data collection where sampled non push pull farmers were interviewed before and after exposure to push pull knowledge using participatory video and drama. Data obtained was analyzed using chi square at 0.05 confidence level set a priori and also presented using frequency tables, percentages, charts and averages relevant. Results show that the effectiveness of participatory video and drama in disseminating   push pull content is significantly differentiated by the type or component of the push pull knowledge being disseminated. For instance, among farmers exposed to drama, 38.4% were rated as average and good in their understanding of Push Pull concepts, descriptions and definitions compared 19.2% for farmers exposed to participatory video (χ^2=15.949, p0.05). This is completely different for push pull knowledge contents of “establishment and management of Push pull fields”, where among farmers exposed to video,46.1% were rated as good and average compared to 28.2% who were exposed to drama (χ^2=10.1921, p=5). The study concludes that while both methods are cost effective, drama is more effective in  the attraction of larger crowd ,ignition of initial  interest  and educating farmers  on  minimum basics of push pull technology .Participatory video does better in explaining deeper details of push pull knowledge where farmers need not only to hear of the technology but also to adopt it .However no single dissemination method can work perfectly alone, whereas drama can be used as an introductory in attracting the crowd and teaching the basic technological knowledge of push pull technology, this knowledge can be affirmed for purposes of actual adoption by other dissemination methodologies like   participatory video. 

scholarly journals Numerical groyne layout optimisation for restoration projects in large rivers: An adaptive approach towards a desired morphodynamic equilibrium

2018 ◽  
Vol 40 ◽  
pp. 02002
Author(s):  
Martin Glas ◽  
Michael Tritthart ◽  
Marcel Liedermann ◽  
Sebastian Pessenlehner ◽  
Helmut Habersack
Keyword(s):  
Transport Model ◽  
Numerical Models ◽  
Cost Effective ◽  
Pilot Project ◽  
Large Rivers ◽  
Sediment Transport Model ◽  
River Bed ◽  
Morphodynamic Equilibrium ◽  
3D Numerical Model ◽  
Restoration Measures

Integrative restoration measures at large rivers target the improvement of morphological and ecological conditions, under consideration of economic demands, specifically navigational ones. Alternative groyne layouts with e.g. reduced groyne spacing and lowered crest elevation reduce ecological deficits and have the potential to cease frequently encountered river bed incision of heavily modified rivers. On the other hand, the induced change in the morphodynamic equilibrium may interfere with navigation by reducing the water depth in the fairway. In 2009, a pilot project was realised on the Austrian Danube, including an alternative groyne layout. As a consequence the desired aggradations in the fairway became too large, leading to an increased dredging effort. In 2014, a numerical groyne optimisation, specifically a 3D numerical model in combination with a sediment transport model, was applied. In 2015, after implementing the optimised groyne layout in the field, morphodynamic equilibrium was reached reducing the need of extensive dredging. This equilibrium could be shown by analysing subsequently observed bathymetries until 2017. Moreover, the morphodynamic changes due to the groyne optimisation in 2015 were reproduced successfully with the numerical models. Thus they represent a cost effective tool for planning and optimising future restoration measures in large and heavily modified rivers.

scholarly journals Monitoring of waters status on the area of the waste landfill – case study Piškornica

2019 ◽  
Vol 6 (2) ◽  
pp. 49-58
Author(s):  
Jasna Nemčić-Jurec
Keyword(s):  
Water Management ◽  
Surface Water ◽  
Numerical Model ◽  
Groundwater Flow ◽  
Groundwater Pollution ◽  
Waste Landfill ◽  
Significant Difference ◽  
Before And After ◽  
Harmful Effects

The remediation of the municipal waste landfill reduces the harmful effects of inadequately disposed waste in the environment and reduce the risks on human health. The aim of this paper is to evaluate the efficiency of the remediation (2005 to 2012) of waste landfill of Piškornica. Groundwater from piezometers (P2, P3, P4 and P5) at Piškornica and surface water from the Gliboki stream (upstream and downstream) were analyzed, before and after the remediation. The results of the analyzed parameters (KPK, BPK5, electroconductivity, iron) showed significant decrease in values (p <0.05) and up to 82% (BPK5 in P5) after remediation. The most significant decrease in the value of the indicators was determined in the P5, which is nearest and downstream from the landfill body. Significant difference (p <0.05) was not found at the upstream and downstream locations of the Gliboki stream basin before and after remediation. The numerical model of the groundwater flow shows that groundwater pollution will not occur even in the worst scenario (the largest possible pumping of 420 l/s) of the current capacity of the Ivanščak source. The results contributed to decisions on water management and further monitoring of water plans on landfill area.

scholarly journals Balancing river restoration measures around a river bifurcation: A case study from the Netherlands

2018 ◽  
Vol 40 ◽  
pp. 06019
Author(s):  
Ralph Schielen ◽  
Bert Voortman ◽  
Tjeerd Driessen
Keyword(s):  
The Netherlands ◽  
River Restoration ◽  
Planning Process ◽  
Control Structure ◽  
Rhine River ◽  
Control Structures ◽  
Flood Level ◽  
Level Lowering ◽  
Restoration Measures

The Rhine River in the Netherlands still has some characteristics of a delta, although the river is extremely engineered and confined between dikes. An important characteristic are the bifurcation points where the river bifurcates into different branches. The discharge partitioning at the bifurcates is predefined, as this is an important element for the protection of the downstream branches. Adjustable control structures in the vicinity of the bifurcation point facilitate this setting. In order to mitigate higher discharges due to climate change, measures in the floodplains to reduce flood levels are projected. In the planning process, it is important to maintain the discharge partitioning and to guarantee a setting of the control structure such that some control space is left. This can be done by balancing measures. A measure which lowers the flood levels on one branch, should be balanced by another measure on the other branch in order to maintain the correct settings. This requires a careful planning process and careful considerations between flood level lowering and settings of the control structures.

Disposable Fibre Optic Intervention System: Case Study of Successful Leak Detection Offshore North Sea

2021 ◽  
Author(s):  
Craig Feherty ◽  
Andrew Garioch ◽  
Annabel Green
Keyword(s):  
North Sea ◽  
Single Mode ◽  
Cost Effective ◽  
Leak Detection ◽  
Fibre Optic ◽  
Distributed Temperature Sensing ◽  
The North ◽  
First Case ◽  
Well Data

Abstract Maintaining well integrity is critical to sustaining production from mature and aging fields. Disposable fibre optic technology has been deployed in wells in the North Sea to locate known tubing leaks in the completion. The disposable fibre optic intervention system releases a probe into the well to enable the deployment of bare fibre optic line. The fibres are released from the probe as it descends into the well. In the presented case study, the probe contained both single-mode and multi-mode fibre optic lines to enable simultaneous Distributed Temperature Sensing (DTS) and Distributed Acoustic Sensing (DAS) surveys to be performed. Once deployed in the well, pressure manipulation programs were performed to activate any tubing or casing leaks while acquiring DTS and DAS data. As a result of the exceptional sensitivity of the bare fibres and the effective coupling of the fibre with the tubing wall the technology is shown to be highly effective in detecting leaks and confirming barrier integrity. In the presented example a leak was located along with the direction and rate of the fluid movement in the ‘B’ annulus. The simplicity of the system and highly efficient operations greatly reduced survey times in comparison to conventional intervention techniques thereby greatly reducing the cost of intervention. It can be demonstrated that the disposable fibre optic deployment system provides a game changing and cost-effective solution for both leak detection and determining liquid levels in the wells. The disposable fibre solution is a unique deployment method which provides an alternative to conventional well surveys, reducing the complexity, time and cost to acquire valuable distributed well data. This is the first case history published for this technology in leak detection application.

Case Study of Particle-Related UV Shielding of Microorganisms When Disinfecting Unfiltered Surface Water

2010 ◽  
Vol 45 (3) ◽  
pp. 343-351 ◽  
Author(s):  
Raymond E. Cantwell ◽  
Ron Hofmann ◽  
Jennie L. Rand ◽  
Patrick M. Devine ◽  
Monique VanderMarck
Keyword(s):  
Surface Water ◽  
Uv Light ◽  
Pilot Scale ◽  
Uv Disinfection ◽  
Particle Count ◽  
Uv Reactor ◽  
Before And After ◽  
Log Linear ◽  
Uv Lamps

Abstract The goal of this case study was to provide pilot-scale information about the ability of ultraviolet (UV) light to disinfect unfiltered surface water. A pilot-scale (0.25 L/s) UV reactor with low-pressure UV lamps was installed on raw water entering an aqueduct from the Pardee Reservoir at the East Bay Municipal District, California. A pilot monitoring system also collected hourly particle count (2 to 100 m), turbidity, and ultraviolet transmittance (UVT) measurements for 14 months. Grab microbial samples were collected and analyzed for indigenous total coliforms and total aerobic spores (TAS) both before and after UV disinfection, to correlate survival of the organisms across the UV reactor to water quality characteristics. Concentrations of indigenous coliforms and TAS ranged up to 163 and 1,383 per 100 mL respectively, before UV exposure. The data showed that the ability of UV to disinfect coliforms was essentially unaffected by the presence of particles (up to 703>10 m per mL and 1.3 nephelometric turbidity unit [NTU]) in the unfiltered surface water. In 13 of 14 samples, no coliforms were detected in the UV treated water. Log-linear inactivation of TAS up to 2.5-log suggests that at least 99.6% of the TAS were not protected from UV disinfection by particles.

scholarly journals MODELING OVERWASH VULNERABILITY ALONG MIXED SAND-GRAVEL COASTS WITH XBEACH-G CASE STUDY OF PLAYA GRANADA, SOUTHERN SPAIN

2017 ◽  
pp. 13 ◽  
Author(s):  
Rafael J Bergillos ◽  
Gerd Masselink ◽  
Robert T McCall ◽  
Miguel Ortega-Sánchez
Keyword(s):  
Morphological Changes ◽  
Propagation Model ◽  
Southern Spain ◽  
Phase Lag ◽  
Field Surveys ◽  
Skill Scores ◽  
Before And After ◽  
Mean Square Errors ◽  
Coarse Gravel

This work aims to calibrate the XBeach-G model on a mixed sand-gravel deltaic coast (Playa Granada, southern Spain) and apply it to address the overwash vulnerability. Field surveys, consisting of topographical measurements and sediment sampling in two selected areas, were performed before and after two extreme southwesterly storms. A calibrated wave propagation model (Delft3D-WAVE) was used to obtain the inshore conditions required to drive the XBeach-G model. The XBeach-G results for the coarse gravel fraction, a sediment friction factor of 0.03 and a Nielsen's boundary layer phase lag of 20º were found to provide the best fits to the observed morphological changes of the beach profile. This indicates that the morphodynamic response of the beach is dominated by the coarse gravel fraction, which is in agreement with previous experimental and numerical works carried out in the study site. The obtained brier skill scores and root-mean-square errors were higher than 0.89 and lower than 0.18 m, respectively, highlighting that the XBeach-G model is capable of reproducing the profile response under southwesterly storm conditions. The model was used to compute the required water level to generate overwash as a function of the wave height and direction, and results show how the application of XBeach-G can be used to address issues of storm-induced coastal vulnerability on gravel-dominated coasts.

The Influence of Attitudes, Subjective, Norms, and Behavior Controls on Intention to Choose Islamic Banks With Islamic Religiosity as a Moderating Variable (Case Study at Bri Syariah Purwokerto Customers)

2018 ◽  
Vol 2 (1) ◽  
Author(s):  
Akhmad Khoyrun Najakh ◽  
Dwiwiyati Astogini ◽  
Sri Martini
Keyword(s):  
Behavioral Control ◽  
Sampling Technique ◽  
Subjective Norm ◽  
Subjective Norms ◽  
Islamic Banks ◽  
Control Behavior ◽  
Before And After ◽  
And Behavior ◽  
Number Of Customers

The purpose of this study was to analyze the influence of attitudes on the intention to choose Islamic banks, to analyze the effect of subjective norm on the intention to choose Islamic banks. to analyze the effect of the control behavior of the intention to choose the Islamic banks, to analyze the moderating influence of religiosity on the relationship attitudes, subjective norms and behavioral control of the intention to choose the Islamic banks . The method used is a survey with a sampling technique used purposive sampling with a sample size of this study was 100 respondents . Further analysis tools used in this study is multiple regression analysis using SPSS 16.0 software . Based on this study it can be concluded that the attitude does not affect to the intention of choose Bank BRISyariah. Subjective norm positive effect on intention choose Bank BRISyariah. Control behavior does not affect to the intention choose Bank BRISyariah. Relationship between Attitudes, Subjective Norms and Behavior Control with the intention to select Bank BRISyariah not moderated by religiosity.Based on these conclusions can be said that the Bank BRISyariah should improve understanding related to the subjective norm in order to increase the number of customers who use the services of Islamic Banking . Further research is recommended in order to follow up and develop this research to further explore the independent and dependent variables continued before and after behavioral intention or intention to perform a specific action .

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