Hydro Nepal: Journal of Water, Energy and Environment最新文献

{"title":"Hydropower in New Roles in Changed Context","authors":"S. Bhat","doi":"10.3126/HN.V22I0.18997","DOIUrl":"https://doi.org/10.3126/HN.V22I0.18997","url":null,"abstract":"This article focuses on how hydropower can facilitate to integrate more and more renewable in the grid. Doing so, we will have to create new hydropower products and market them. This will be possible if we have a vibrant power market allowing marketing of innovative hydropower products offering primary supply as well as other services in the grid. HYDRO Nepal Journal Journal of Water Energy and Environment Issue No: 22 Page: 48-50 Uploaded date: January 14, 2018","PeriodicalId":117617,"journal":{"name":"Hydro Nepal: Journal of Water, Energy and Environment","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124338582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical Study of Wall Shear and Velocities Using a Commercial CFD Code: Some Crucial Aspects to Consider","authors":"B. Baidar, M. Cervantes","doi":"10.3126/HN.V21I0.17835","DOIUrl":"https://doi.org/10.3126/HN.V21I0.17835","url":null,"abstract":"This paper presents the numerical prediction of wall shear and velocities in steady and superposed pulsatile turbulent flow in a pipe, the phenomena that can be observed in hydropower. The previously conducted experiment is a base for this study and some crucial aspects of CFD while using a commercial code have been emphasized. The widely-accepted grid convergence index approach is adopted to quantify the discretization uncertainty and the results are validated against the experiment. The influence of the wall functions applied in the code is also studied with two turbulence models: standard k-e and kω based SST model. The time-averaged results of superposed flow with small amplitude unsteadiness are equivalent to results from the steady flow. The results and the method used in this paper may be useful for the CFD simulations in hydropower applications like penstock and bifurcations designs. HYDRO Nepal Journal Journal of Water Energy and Environment Issue: 21, July, 2017 Page: 45-49 Upload Date: July 20, 2017","PeriodicalId":117617,"journal":{"name":"Hydro Nepal: Journal of Water, Energy and Environment","volume":"116 9. Vyp. 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130098918","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hydropower development in Nepal: WHAT went WRONG!","authors":"R. P. Thanju","doi":"10.3126/HN.V21I0.17829","DOIUrl":"https://doi.org/10.3126/HN.V21I0.17829","url":null,"abstract":"Not Available. HYDRO Nepal Journal Journal of Water Energy and Environment Issue: 21, July, 2017 Page 1-1 Upload Date: July 18, 2017","PeriodicalId":117617,"journal":{"name":"Hydro Nepal: Journal of Water, Energy and Environment","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122318633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimizing Location of Cutoffs to Improve Safety and Economy of Hydropower Projects","authors":"A. Khanal","doi":"10.3126/hn.v21i0.17820","DOIUrl":"https://doi.org/10.3126/hn.v21i0.17820","url":null,"abstract":"Large numbers of perennial rivers flowing through steep gradient has made Nepal an ideal place for hydropower development. Development of hydropower project in most economical way possible is the first prerequisite to get maximum benefit from harnessing water resources. The maximum benefit can be achieved only through optimal design of the project. Each project component must be designed considering the required level of factor of safety, performance standards of each component and economy. On this backdrop, this paper intends to optimize the location of cutoffs in headworks to get maximum benefits from use of it in terms of safety and economy. Improper placement of cutoff not only reduces the factor of safety against piping but also curtails the project benefits due to excessive seepage flow. Piping (internal erosion of soil particles under structure) is associated with high exit gradient. It threatens the structural stability and ultimately leads to failure of structure while as excessive seepage flow limits the availability of flow for power generation and reduces the project benefits. So, the optimal design of headworks is an attempt to identify the best location of cutoff to control seepage flow and reduce exit gradient. Five different cases representing different location of cutoff were analyzed and their roles in controlling seepage flow and reducing exit gradient was evaluated to optimize the cutoff location. 2D Finite Element Method (FEM) was used for the seepage analysis. The analysis showed that cutoffs are essential to control seepage flow when dam/weir is founded in pervious soil. However, the best location to place cutoff must be adroitly identified to reap maximum benefit from use of cutoff. The analysis reveals that the role of central cutoff in controlling seepage flow and reducing exit gradient is very limited. Likewise, the u/s cutoff has minimum effect in reducing exit gradient but the d/s cutoff seemed very effective in reducing exit gradient resulting increased factor of safety against piping. Hence, this paper concludes that the d/s end is the optimal location to place cutoff to improve safety and economy of the project. In addition, the use of both u/s and d/s cutoffs extend positive roles both in controlling seepage flow and reducing exit gradient. However, in author’s opinion the construction cost of two cutoffs must be compared with benefit added by use of two cutoffs over use of single d/s cutoff.  HYDRO Nepal Journal Journal of Water Energy and Environment Issue: 21, July, 2017 Page: 42-44 Upload Date: July 18, 2017","PeriodicalId":117617,"journal":{"name":"Hydro Nepal: Journal of Water, Energy and Environment","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116231744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"3D in-Situ Stress Model of Upper Tamakoshi Hydroelectric Project Area","authors":"Chhatra Bahadur Basnet, K. K. Panthi","doi":"10.3126/HN.V21I0.17819","DOIUrl":"https://doi.org/10.3126/HN.V21I0.17819","url":null,"abstract":"Reliable estimation of in-situ stress state is very important in implementing the shotcrete lined/ unlined tunnels and shafts. The in-situ stress state of the area of concern is mainly governed by the gravity-induced stress, tectonic activity of the earth’s crust and topographic condition of that area. The local tectonic and geological environment such as faulting and shearing activities in general influences the magnitude of tectonic stress level. The Himalayan region is renowned with its active tectonic movement (earthquake activities), which causes accumulation and sudden release of strain energy instigating changes in the stress environment. This paper aims to evaluate in-situ stress state at the Upper Tamakoshi Hydroelectric Project, where shotcrete lined/ unlined headrace tunnel with considerable hydrostatic head is being implemented. A detailed assessment of the in-situ stress state is carried out by using both measured data and three-dimensional numerical analysis using FLAC3D. HYDRO Nepal Journal Journal of Water Energy and Environment Issue: 21, July, 2017 Page: 34-41 Upload Date: July 18, 2017","PeriodicalId":117617,"journal":{"name":"Hydro Nepal: Journal of Water, Energy and Environment","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114099750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Variation Orders and It's Procedure for Hydropower Construction","authors":"A. Neupane","doi":"10.3126/hn.v21i0.17816","DOIUrl":"https://doi.org/10.3126/hn.v21i0.17816","url":null,"abstract":"There is lots of construction going in Nepal, of which hydropower construction is also moving in significant pace. As the design and drawings prepared during development of the hydropower project may not fully reflect the construction situation, due to the different circumstances led by the Employer, Engineer or Contractor working for the Project. It has been observed globally that the design during project preparation in hydropower projects needs revision during implementation; hence the basic understanding of Variation Orders is very important to the hydropower professionals.  HYDRO Nepal Journal Journal of Water Energy and Environment Issue: 21, July, 2017 Page: 15-16 Upload Date: July 18, 2017","PeriodicalId":117617,"journal":{"name":"Hydro Nepal: Journal of Water, Energy and Environment","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125353720","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reflections on India’s ‘Guidelines on Cross Border Trade of Electricity’ Vis-a-vis Nepal’s ‘Electricity Development Decade 2016/’026’ and ‘2017/’018 Budget’","authors":"S. Pun","doi":"10.3126/HN.V21I0.17814","DOIUrl":"https://doi.org/10.3126/HN.V21I0.17814","url":null,"abstract":"Nepal unfurled her 10,000 MW in 10 years Electricity Development Decade 2016/’026 in February 2016 supposedly with one eye on her own domestic consumption but definitely with the other eye on India’s growing hungry market. India, for ‘strategic, national and economic’ reasons, issued her Guidelines on December 5, 2016 whereby preferential treatment is given to Indian entities that wish to export power from Nepal to India. While Indian entities with 51% or more ownership require a one-time approval, all other participating entities are eligible to participate on ‘ case to case basis .’ The concerned authorities of Nepal, thick-skinned as they are, made no fuss at all about India’s Guidelines. In fact, Nepal held the 5 th Power Summit on December 16, 2016 concluding that, though the 10,000 MW is ambitious, it is realistic and achievable. In the immediate aftermath in January 2017, the USAID financed Delhi-based IRADe launched its report in Kathmandu wherein the Nepalese media was all agog reporting ‘Nepal can earn Rs 1 Trillion a year by selling power.’ This was then followed by the Nepal Investment Summit jamboree in March 2017 that boasted of garnering 13.6 billion US$ foreign commitments. All these were then topped by the Nepal government’s 2017/’018 budget that sanguinely hiked up the “10,000 MW in 10 years’ to an inconceivable ‘ 17,000 MW in 7 years !’ Sans the electricity regulatory commission, sans the Indo-Nepal downstream benefit sharing mechanism from storage projects and sans the huge required capital skillfully throttled by India’s Guidelines, Nepal’s 17,000 MW in 7 years is an extremely tall order, more likely to end up in the manner of Som Sharma’s sattu! HYDRO Nepal Journal Journal of Water Energy and Environment Issue: 21, July, 2017 Page: 5-10 Upload Date: July 18, 2017","PeriodicalId":117617,"journal":{"name":"Hydro Nepal: Journal of Water, Energy and Environment","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121516628","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Riverfront Restoration Plan Using Cipar Index: A Case Study of Gomti River, India","authors":"M. Tripathi, S. K. Singal","doi":"10.3126/HN.V21I0.17818","DOIUrl":"https://doi.org/10.3126/HN.V21I0.17818","url":null,"abstract":"Restoration of a polluted river front is as important as conservation of a polluted river itself because its shore line has the potential of making the conservation project self-sustainable. In the present study, an attempt has been made to study the polluted river front of a river in India. A self-sustainable restoration and development experimental plan has been prepared for the area considered in the study. This experimental plan aims at utilizing arable land strips on both sides of the river, currently deserted or encroached by rank vegetation, open wastewater drains, etc. The cost estimates have also been presented for various items and actions proposed under this study to prove its economical sustainability in the long run. The proposed plan and the existing conditions have been compared using CIPAR index to ensure increased public accessibility. It has been found that the present unsatisfactory conditions of the riverfront considered in this study can be raised to more than 90 % satisfaction by implementation of the proposed plan in a period of 3 to 4 years. HYDRO Nepal Journal Journal of Water Energy and Environment Issue: 21, July, 2017 Page: 25-33 Upload Date: July 18, 2017","PeriodicalId":117617,"journal":{"name":"Hydro Nepal: Journal of Water, Energy and Environment","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130391482","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hydro Nepal Excellence Awards Brief","authors":"J. Thapa","doi":"10.3126/hn.v21i0.17823","DOIUrl":"https://doi.org/10.3126/hn.v21i0.17823","url":null,"abstract":"Not Available. HYDRO Nepal Journal Journal of Water Energy and Environment Issue: 21, July, 2017 Page: 1-2 Upload Date: July 18, 2017","PeriodicalId":117617,"journal":{"name":"Hydro Nepal: Journal of Water, Energy and Environment","volume":"126 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114409351","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Stabilization Measure Adopted for Controlling Landslide: A Case Study of Upper Mai Hydroelectric Project","authors":"Kanchan Chaulagai","doi":"10.3126/HN.V21I0.17815","DOIUrl":"https://doi.org/10.3126/HN.V21I0.17815","url":null,"abstract":"Stability is the key issue in landslide stabilization. Methodology and component adopted in stabilizing the slide play vital role in this regards. In many occasion, stability measure adopted for controlling slide has been found to be unsuccessful, inadequate causing not only the safety risk but also huge economic loss. This paper describe history, effects, causes, stabilization measures and effectiveness of these measures played for controlling landslide of headwork area of Upper Mai Hydroelectric Project. The pioneering solution applied for landslide stabilization such as application of rock bolts, shotcrete and water management found to be highly effective in controlling the landslide.  HYDRO Nepal JournalJournal of Water Energy and EnvironmentIssue: 21, July, 2017Page: 11-14Upload Date: July 18, 2017","PeriodicalId":117617,"journal":{"name":"Hydro Nepal: Journal of Water, Energy and Environment","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121836184","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}