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DEVELOPMENT OF A SEMI-DISTRIBUTED HYDROLOGICAL MODEL FOR GLACIATED PUNATSHANGCHU BASIN IN BHUTAN 不丹punatshangchu冰川盆地半分布式水文模型的建立
Q4 Engineering Pub Date : 2021-06-30 DOI: 10.54417/jaetm.v1i1.19
V. Sharma, Jessica Jorden, P. Manso, G. D. Cesare
Hydropower plays a pivotal role in the socio-economic development of Bhutan where water resource is abundantly available and therefore several hydropower plants are being planned and a few under construction. However, with the presence of several potentially dangerous glacier lakes within the higher elevations, the country is always at the risk of Glacial Lake Outburst Flood (GLOF) and climate change which poses higher uncertainty regarding the sustainability of hydropower reservoirs in the long run. To understand the hydrological response of the basin, where new hydropower plants are going to be installed soon, a complex semi-distributed hydrological model has been prepared for the Punatshangchu basin using RS MINERVE. After calibration and validation of the model, it is observed that the model reflects low relative volume bias (-0.196 - 0.050) and high Nash efficiency (0.540 - 0.990) which is an important aspect to be considered for any hydropower dam and its operational schemes. Such a model is a viable tool well adapted to an operational flood forecasting system and management. With the built-in scheme for hydropower, reservoir, planner, and turbines within RS Minerve, it could be used to understand the array of scenarios for planning and operations.
水力发电在不丹的社会经济发展中起着关键作用,不丹的水资源丰富,因此正在规划几个水电站,并正在建设几个水电站。然而,由于在高海拔地区存在几个潜在危险的冰川湖,该国总是面临冰湖溃决洪水(GLOF)和气候变化的风险,这给水电站水库的长期可持续性带来了更高的不确定性。为了了解即将安装新水电站的流域的水文响应,使用RS MINERVE为Punatshangchu流域准备了复杂的半分布式水文模型。通过对模型的标定和验证,发现该模型具有较低的相对体积偏差(-0.196 ~ 0.050)和较高的纳什效率(0.540 ~ 0.990),这是任何水电站大坝及其运行方案都应考虑的重要方面。这种模型是一种可行的工具,可以很好地适用于实际的洪水预报系统和管理。RS Minerve内置水电、水库、规划器和涡轮机方案,可用于了解规划和操作的一系列场景。
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引用次数: 0
SIMULATION AND MODELING OF INTEGRATED RENEWABLE ENERGY RESOURCES (HYDRO, SOLAR AND WIND ENERGY) 综合可再生能源(水电、太阳能、风能)仿真与建模
Q4 Engineering Pub Date : 2021-06-30 DOI: 10.54417/jaetm.v1i1.25
S. Dorji, Hemlal Bhattarai, P.Mallikarjun sharma, Sonam Yoser, Karma Singye, J. Tenzin
Renewable energy sources are likely to become prominent in the future due to less environmental impact and energy cost escalation. However, due to its intermittent essence, it encourages us to integrate various renewable energy resources to improve the reliability and quality of power supply to the consumer. Henceforth, this paper emphasizes the integration of various renewable energy sources (RES) such as - photovoltaic (PV), wind energy (WE) and hydro-electric grid (HEG) systems through software simulation. The purpose of this research was to compare the end user power quality and reliability between isolated mode and integrated mode operation of the power system through the result analysis in MATLAB simulation. In this qualitative study, the required data on wind and solar of a particular place, Samdrup Jongkhar (Bhutan) were collected in the form of satellite recorded data (NASA and SolarGIS). The result from this study highlights the nature of energy output from isolated-mode operated power plants and integrated power plant systems. From the result analysis, it has been shown that the quality and reliability of energy output from an integrated power system is much higher as compared to the isolated-mode operated power plant.
由于对环境的影响较小,能源成本上升,可再生能源在未来可能会变得突出。然而,由于其间歇性的本质,它鼓励我们整合各种可再生能源,以提高向消费者供电的可靠性和质量。因此,本文强调通过软件仿真实现各种可再生能源(RES)如光伏(PV)、风能(WE)和水力电网(HEG)系统的集成。本研究的目的是通过MATLAB仿真的结果分析,比较电力系统隔离模式和集成模式运行的最终用户电能质量和可靠性。在这项定性研究中,以卫星记录数据(NASA和SolarGIS)的形式收集了Samdrup Jongkhar(不丹)这一特定地点所需的风能和太阳能数据。这项研究的结果突出了隔离模式运行的发电厂和综合发电厂系统的能量输出的性质。结果分析表明,综合电力系统输出电能的质量和可靠性远远高于隔离模式运行的电厂。
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引用次数: 0
ANALYSIS ON PREDICTION OF PATH LOSS FOR MOBILE NETWORK IN JNEC, DEWATHANG AT 1800 MHz 1800mhz时dewahang JNEC移动网络路径损耗预测分析
Q4 Engineering Pub Date : 2021-06-30 DOI: 10.54417/jaetm.v1i1.24
Bevek Subba, Namgay Dema, Thinley Wangmo
As the mobile cellular subscription is constantly increasing, the demand for good network and data traffic, remains to be high. In order to achieve that, proper network planning is important to enhance reliable mobile network and optimization. Path loss modelling is extensively used in the initial feasibility studies for the proper deployment of telecommunication. Prediction of path loss helps to indicates the field strength of the radio propagation. Path loss is the weakening of signal strength during propagation and can be determined by using different models. Largely affected by the complex terrain, buildings, trees, generally, the path loss is caused by reflection, refraction and diffraction. The evaluation is performed at 1800 MHz frequency which is the operating band of Long-Term Evolution (LTE) 4G network service in the region. A comparative study is done between different types of path loss models used in LTE networks in MATLAB. Analysis of path loss for irregular terrain in the region is also being simulated using Radio-mobile. With this study, a person can predict the mobile signal quality and a proper network can be planned.
随着移动蜂窝用户的不断增加,对良好的网络和数据流量的需求仍然很高。为此,合理的网络规划对于增强移动网络的可靠性和优化至关重要。路径损耗模型广泛用于电信合理部署的初步可行性研究。路径损耗的预测有助于表明无线电传播的场强。路径损耗是信号在传播过程中强度的减弱,可以通过使用不同的模型来确定。在很大程度上受复杂地形、建筑物、树木的影响,路径损耗主要由反射、折射和衍射引起。评估在1800mhz频段进行,该频段是该地区LTE (Long-Term Evolution) 4G网络业务的工作频段。在MATLAB中对LTE网络中不同类型的路径损耗模型进行了比较研究。还利用Radio-mobile模拟了该地区不规则地形的路径损失分析。通过这项研究,人们可以预测移动信号质量,并可以规划适当的网络。
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引用次数: 0
PHOTOGRAMMETRIC MAPPING FROM HIGH-RESOLUTION STEREO IMAGERY AND COMPARATIVE ANALYSIS USING EXISTING DATA 从高分辨率立体图像和利用现有数据进行比较分析的摄影测量制图
Q4 Engineering Pub Date : 2021-06-30 DOI: 10.54417/jaetm.v1i1.26
Yangchen Pelmo, J. Tenzin, Dawa Tshering, Pema Tshedrup
The launch of the very high resolution (VHR) sensor satellites has paved the way for further exploitation of the capabilities of stereo satellite imagery for many applications and most importantly in the extraction of topographical details. Advances in digital technologies in the photogrammetric technique provide more accurate and up to date topographic representation, while traditional methods of topographic mapping are time-consuming and require large technical support. This paper explores the methods of production and an analysis of the capabilities of the high-resolution stereo imaging system for the extraction of features (topographic map) and generation of digital elevation model (DEM). This study uses high-resolution GeoEye-1 stereo pair images. For qualitative assessment, topographic features were extracted by digitizing the georeferenced stereo pair images and overlapped to form a DEM and orthophoto within the Summit Evolution software. Georeferencing was carried out using the existing Ground Control Points (GCPs) and Check Points (CPs) established using Real-Time Kinematic Global Navigation Satellite System (RTK-GNSS) technique. For quantitative assessment, a total of 7 existing GCPs were considered suitable for use and 5 CPs were established as a check for accuracy of the output. The accuracy of the CPs was evaluated by computing Root Mean Square Error (RMSE). The average horizontal RMSE for the left image and right image were 1.17150098m and 0.819334672m respectively and the average vertical RMSE was 1.605898565m. Additionally, the standard deviation for elevation data from generated DEM using photogrammetric technique and existing elevation data of RTK-GNSS technique were computed, which resulted in 15.91286667 and 16.59529228 respectively. The accuracy was evaluated by comparing the results of the data extracted using stereo satellite images and those extracted from ground measurement techniques (Total station and RTK-GNSS). The comparative analysis showed that stereo pair images provide a viable alternative to other ground mapping techniques providing results within the acceptable range. Based on error estimation and analysis, it concludes that, if strict photogrammetric processing model and ground control points are employed, high-resolution satellite imagery can be used for the accurate generation and update of the topographic maps, DEM and digital orthophotos, which can be further be used as a reference for comparative analysis applications.
超高分辨率(VHR)传感器卫星的发射为进一步开发立体卫星图像的能力铺平了道路,用于许多应用,最重要的是提取地形细节。数字技术在摄影测量技术方面的进步提供了更准确和最新的地形表示,而传统的地形测绘方法耗时且需要大量的技术支持。本文探讨了高分辨率立体成像系统在提取地形图和生成数字高程模型(DEM)方面的生产方法和能力分析。本研究使用高分辨率GeoEye-1立体图像对。为了进行定性评估,地形特征通过对地理参考立体对图像进行数字化提取,并在Summit Evolution软件中重叠形成DEM和正射影像。利用实时运动学全球导航卫星系统(RTK-GNSS)技术建立的现有地面控制点(gcp)和检查点(CPs)进行地理参考。为了进行定量评估,共有7个现有的gcp被认为适合使用,并建立了5个cp以检查输出的准确性。通过计算均方根误差(RMSE)来评估CPs的准确性。左右图像的平均水平RMSE分别为1.17150098m和0.819334672m,垂直平均RMSE为1.605898565m。利用摄影测量技术生成的DEM与现有RTK-GNSS技术的高程数据进行高程数据标准差计算,分别得到15.91286667和16.59529228。通过比较使用立体卫星图像提取的数据和从地面测量技术(全站仪和RTK-GNSS)提取的数据的结果,对精度进行了评估。对比分析表明,立体图像对提供了一种可行的替代其他地面测绘技术,其结果在可接受的范围内。通过误差估计和分析,得出在采用严格的摄影测量处理模型和地面控制点的情况下,高分辨率卫星影像可用于地形图、DEM和数字正射影像的精确生成和更新,可进一步作为对比分析应用的参考。
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引用次数: 0
PERFORMANCE MEASURE OF SERIES-PARALLEL PIEZOELECTRIC TRANSDUCER CIRCUITY FOR IMPROVEMENT OF OUTPUT VOLTAGE 提高压电换能器输出电压的串并联电路性能测量
Q4 Engineering Pub Date : 2021-06-30 DOI: 10.54417/jaetm.v1i1.21
T. Dema, Srijana Gajmer, T. Dema, Renuka Mothey, Birman Rai
This project presents a comparative study between power generation using piezoelectric transducers available in the literature and the proposed model design. The parallel and series-connected piezoelectric transducers arrangement in this project, when subjected to mechanical stress (footsteps), generates an electric charge. The power generated from piezoelectric transducers will be given as input to bridge rectifier and chopper for conversion to dc quantity and its amplification respectively. This energy will be stored in a Li-ion battery. The paper mainly highlights aspects of improvement of power generation by optimizing circuit design and adapting output enhancement and amplification. Comparative analysis of power generated from predecessor circuit designs and output voltage obtained from current circuit design is validated and presented
本计画提出利用文献中可用的压电换能器发电与提出的模型设计之间的比较研究。在这个项目中,并联和串联的压电换能器在受到机械应力(脚步声)时,会产生电荷。压电换能器产生的电能将分别作为输入给桥式整流器和斩波器转换成直流量并进行放大。这些能量将被储存在锂离子电池中。本文着重从优化电路设计和适应输出增强和放大等方面对发电性能进行了改进。验证并给出了前人电路设计产生的功率与当前电路设计得到的输出电压的对比分析
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引用次数: 0
EFFECTS OF INFILL WALLS ON BUILDING BEHAVIOUR UNDER SEISMIC LOADS 地震荷载作用下填充墙对建筑性能的影响
Q4 Engineering Pub Date : 2021-06-30 DOI: 10.54417/jaetm.v1i1.22
Lobzang Dorji
In the design of Reinforced Concrete (RC) building, infill walls are normally assumed as non-structural elements and they are accepted as vertical uniform loads on beams. Therefore, the RC buildings are designed as bare frame structures. However, in reality, infill walls are present in RC buildings, and the seismic performance of the buildings will be different with and without infill walls.  In this study, 5 storey RC buildings with 2 bays and 5 bays in X-direction and Y-direction respectively are considered. The infill walls were replaced as equivalent diagonal struts and the non-linear static pushover analysis was performed to evaluate the effects of infill walls on the overall performance of the structures. The lateral strength capacity and performance point of the building were determined for the conventional (bare frame) method and with the presence of infill walls. The study reveals that the effects of infill walls under seismic loads in significant until elastic region in which the initial stiffness and strength of the structures increases, while lateral deformation capacity decreases. It is also observed that there are no significant changes in terms of ultimate lateral strength and roof displacement of the building as compared within presence of infill walls and bare frame. 
在钢筋混凝土(RC)建筑设计中,填充墙通常被视为非结构单元,并被接受为梁上的垂直均布荷载。因此,钢筋混凝土建筑设计为裸框架结构。然而,在现实中,钢筋混凝土建筑中存在填充墙,并且在有填充墙和没有填充墙的情况下,建筑物的抗震性能会有所不同。本研究考虑5层钢筋混凝土建筑,分别在x方向和y方向上有2个隔板和5个隔板。将填充墙替换为等效斜支撑,进行非线性静力推覆分析,评价填充墙对结构整体性能的影响。建筑的横向强度能力和性能点是根据传统的(裸框架)方法和填充墙的存在来确定的。研究表明,在弹性区域内,填充墙在地震荷载作用下的影响是显著的,在弹性区域内,结构的初始刚度和强度增加,而侧向变形能力下降。还可以观察到,与存在填充墙和裸框架相比,建筑物的极限侧移强度和屋顶位移没有显着变化。
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Journal of Technology, Management, and Applied Engineering
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