RBRH-Revista Brasileira de Recursos Hidricos最新文献_第9页

Intensity-duration-frequency curves in the municipality of Belo Horizonte from the perspective of non-stationarity 非平稳性视角下贝洛奥里藏特市的强度-持续时间-频率曲线

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RBRH-Revista Brasileira de Recursos Hidricos Pub Date : 2021-01-01 DOI: 10.1590/2318-0331.262120210017

A. A. Nunes, E. Pinto, M. Baptista, Mhaisa Henrique de Paula, Mateus Oliveira Xavier

{"title":"Intensity-duration-frequency curves in the municipality of Belo Horizonte from the perspective of non-stationarity","authors":"A. A. Nunes, E. Pinto, M. Baptista, Mhaisa Henrique de Paula, Mateus Oliveira Xavier","doi":"10.1590/2318-0331.262120210017","DOIUrl":"https://doi.org/10.1590/2318-0331.262120210017","url":null,"abstract":"ABSTRACT The study of changes in hydrological data series is of great scientific and practical importance for water resources systems, since these are normally projected based on the assumption that time series is statistically stationary. However, such assumption may not be verified when aspects as changes or climatic variability are considered. In this sense, the present study sought to identify trends in maximum rainfall intensities in Belo Horizonte (MG) and propose, in view of the observed results, a new intensity-duration-frequency (IDF) curve from the perspective of non-stationarity. For the trend analysis, statistical tests were applied, and an adaptation of the concept “Minimax Design Life Level” was proposed to quantify rainfall intensities and fit a non-stationary IDF curve. As a result, different trends were detected, with an increase in rainfall intensities for durations equal to or less than 1 hour starting in 2000. Regarding the IDF relationships, the obtained rain intensities were up to 48% higher than current estimates. Our results emphasize the need to periodically review IDF relationships in order to avoid under or overestimation in the design of hydraulic structures.","PeriodicalId":54151,"journal":{"name":"RBRH-Revista Brasileira de Recursos Hidricos","volume":"6 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78965461","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}

引用次数: 3

Optimal architecture for artificial neural networks as pressure estimator 人工神经网络压力估计器的最优结构

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RBRH-Revista Brasileira de Recursos Hidricos Pub Date : 2021-01-01 DOI: 10.1590/2318-0331.262120210100

Rui Gabriel Souza, B. Brentan, G. Lima

引用次数: 1

Influence of rainfall and design criteria on performance of rainwater harvesting systems placed in different Brazilian climatological conditions 降雨和设计标准对巴西不同气候条件下雨水收集系统性能的影响

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RBRH-Revista Brasileira de Recursos Hidricos Pub Date : 2021-01-01 DOI: 10.1590/2318-0331.262120210067

Carla Fernanda Perius, R. Tassi, Lucas Alves Lamberti, A. Silva, Liriane Élen Böck

{"title":"Influence of rainfall and design criteria on performance of rainwater harvesting systems placed in different Brazilian climatological conditions","authors":"Carla Fernanda Perius, R. Tassi, Lucas Alves Lamberti, A. Silva, Liriane Élen Böck","doi":"10.1590/2318-0331.262120210067","DOIUrl":"https://doi.org/10.1590/2318-0331.262120210067","url":null,"abstract":"ABSTRACT Using rainwater harvesting (RWH) system is influenced by socioeconomic, environmental and technical factors. This work presents as analysis of the influence of the rainfall time series characteristics and design criteria on RWH performance of five Brazilian capitals with different climatic characteristic: Goiânia, João Pessoa, Manaus, Porto Alegre and São Paulo. The analysis combined different rooftop areas, storage volumes and the indoor and outdoor demands. Rainfall temporal discretization and the types of demands were the most important characteristics when assessing RWH reliability. Daily rainfall data were suitable for sizing the RWH, the time series length influenced the sizing of larger storage volumes, and the RWH efficiency was not significantly affected by the first-flush. Toilet flushing and the irrigation demands had the greatest impact on RWH performance. The greatest potentials for the implementation of RWH were observed for Porto Alegre, because of well distributed rainfall throughout the year, and for Manaus owing to higher annual volumes of precipitation. These results highlight relevant aspects that must be observed during the conception and design of RWH, complementing the guidelines provided in the Brazilian technical standards.","PeriodicalId":54151,"journal":{"name":"RBRH-Revista Brasileira de Recursos Hidricos","volume":"2015 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83404213","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}

引用次数: 3

Statistical analysis of hydrochemistry and isotopic characterization of groundwater from the Parecis Basin 帕雷西斯盆地地下水水化学及同位素特征的统计分析

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RBRH-Revista Brasileira de Recursos Hidricos Pub Date : 2021-01-01 DOI: 10.1590/2318-0331.262120210087

M. R. Stradioto, E. H. Teramoto, H. K. Chang

{"title":"Statistical analysis of hydrochemistry and isotopic characterization of groundwater from the Parecis Basin","authors":"M. R. Stradioto, E. H. Teramoto, H. K. Chang","doi":"10.1590/2318-0331.262120210087","DOIUrl":"https://doi.org/10.1590/2318-0331.262120210087","url":null,"abstract":"ABSTRACT Knowledge of mechanism controlling the hydrochemistry of groundwater are crucial requirement to understand the hydrochemical evolution and evaluate the water quality of subsurficial water resources. Thus, to understand the process governing the hydrochemistry variability and flow dynamics of the Parecis and Ronuro Aquifers, the use of statistical analysis and isotopic characterization were combined. In the correlation matrix it was found that the highest correlation coefficient was observed for HCO3-, Ca2+, Mg2+, Sr2+, SO42-, and F-, which suggested that these parameters are derived from the same source, most likely from rock–water interactions. Additionally, we noticed moderate to high correlation among NO3-, Cl-, Na+, K+, and Ba2+, which collectively are indicative of domestic sewage contamination. Finally, a principal component analysis (PCA) identified that the most variance in hydrochemistry from the evaluated samples was controlled by HCO3-, Ca2+ and Mg2+, which is associated with rock–water interaction. Regarding the 18O and 2H isotope values, it could be observed that the aquifer recharges were of meteoric origin and that the Ronuro Aquifer samples were more enriched than the PAS samples. This work reinforces the capability of multivariate statistics to discern the main process that controls the variability of groundwater hydrochemistry.","PeriodicalId":54151,"journal":{"name":"RBRH-Revista Brasileira de Recursos Hidricos","volume":"58 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74638396","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}

引用次数: 1

Induced aeration flow over stepped spillways: mean pressures, air entrainment and flow behavior 阶梯式溢洪道上的诱导曝气流量:平均压力、空气夹带和流动特性

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RBRH-Revista Brasileira de Recursos Hidricos Pub Date : 2021-01-01 DOI: 10.1590/2318-0331.262120210098

C. K. Novakoski, Rute Ferla, P. S. Priebe, Aline Saupe Abreu, M. Marques, Maurício Dai Prá, A. V. Canellas, E. D. Teixeira

{"title":"Induced aeration flow over stepped spillways: mean pressures, air entrainment and flow behavior","authors":"C. K. Novakoski, Rute Ferla, P. S. Priebe, Aline Saupe Abreu, M. Marques, Maurício Dai Prá, A. V. Canellas, E. D. Teixeira","doi":"10.1590/2318-0331.262120210098","DOIUrl":"https://doi.org/10.1590/2318-0331.262120210098","url":null,"abstract":"ABSTRACT Stepped spillways can dissipate a great amount of energy during the flow passage over the chute, however these structures have limited operation due to the risk of cavitation damage. The induced aeration may protect the concrete chute through the air concentration near the channel bottom. Furthermore, some research studies have indicated that the presence of air in flows may reduce the mean pressures. The present research aims to analyze mean pressures, air entrainment coefficient and flow behavior over a stepped spillway with aeration induced by two different deflectors, comparing the results to natural aeration flow. Despite the jet impact influence, the induced aeration does not change significantly the mean pressures compared to natural aeration flow. The air entrainment coefficient, as well as the jet impact position, is higher for the deflector with the longer extension and, although air bubbles can be seen throughout the extension of the chute due to the air entrainment through the inferior flow surface, the induced aeration did not anticipate the boundary layer inception point position.","PeriodicalId":54151,"journal":{"name":"RBRH-Revista Brasileira de Recursos Hidricos","volume":"9 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81828859","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}

引用次数: 1

Validation of TRMM data in the geographical regions of Brazil 巴西地理区域的TRMM数据验证

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RBRH-Revista Brasileira de Recursos Hidricos Pub Date : 2021-01-01 DOI: 10.1590/2318-0331.262120210071

Rafael Brandão Ferreira de Moraes, F. V. Gonçalves

引用次数: 3

State-transition matrices as an analysis and forecasting tool applied to water quality in reservoirs 状态转换矩阵在水库水质分析预测中的应用

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RBRH-Revista Brasileira de Recursos Hidricos Pub Date : 2021-01-01 DOI: 10.1590/2318-0331.262120210072

J. M. Carvalho, T. Bleninger

{"title":"State-transition matrices as an analysis and forecasting tool applied to water quality in reservoirs","authors":"J. M. Carvalho, T. Bleninger","doi":"10.1590/2318-0331.262120210072","DOIUrl":"https://doi.org/10.1590/2318-0331.262120210072","url":null,"abstract":"ABSTRACT Water reservoirs have the function to control the temporal variability of the water availability, thus bringing greater security over these resources. The water quality of these systems must be adequate for their multiple uses, and one of the main tools to understand it, is mathematical modelling. Given the importance of the water quality, the goal of this paper is to develop an analysis that takes into account the randomness of the variables that affect the thermal and/or biochemical regimes of a reservoir. For this, it is proposed a combination of deterministic and statistical analysis, where the probabilities of occurrence of a given event are considered. Difficult factors, such as the lack of data on the water quality and other variables, were considered, which increases the replicability of the method. The research method is divided into three groups: Modelling, Scenarios and Compilation of these scenarios. Through modelling, a base layout is created, enabling the use of scenarios, which are statistically analysed, and compiled into a state-transition matrix. With this, a more robust tool to understand the dynamics of water quality in a system is obtained, since it is not heavily dependent on field measurements and is easily adaptable and replicable.","PeriodicalId":54151,"journal":{"name":"RBRH-Revista Brasileira de Recursos Hidricos","volume":"12 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88261557","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}

引用次数: 1

Green roof evapotranspiration rates and stormwater control under subtropical climate: a case study in Brazil 亚热带气候下绿色屋顶蒸散速率和雨水控制:以巴西为例

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RBRH-Revista Brasileira de Recursos Hidricos Pub Date : 2021-01-01 DOI: 10.1590/2318-0331.262120210089

Nathana Karina Swarowski Arboit, R. Tassi, Tiago Liberalesso, D. E. Ceconi, Daniel Gustavo Allasia Piccili

{"title":"Green roof evapotranspiration rates and stormwater control under subtropical climate: a case study in Brazil","authors":"Nathana Karina Swarowski Arboit, R. Tassi, Tiago Liberalesso, D. E. Ceconi, Daniel Gustavo Allasia Piccili","doi":"10.1590/2318-0331.262120210089","DOIUrl":"https://doi.org/10.1590/2318-0331.262120210089","url":null,"abstract":"ABSTRACT In this study a long-term field experiment evaluating evapotranspiration rates from irrigated and non-irrigated green roof modules, as well their impacts on stormwater control was accomplished. Six green roof modules (3 irrigated and 3 non-irrigated) vegetated with S. rupestre were monitored throughout 8 months in southern Brazil. Four non-vegetated modules (2 irrigated and 2 non-irrigated) were simultaneously assessed to understand the role of the vegetation in the whole process. The average evapotranspiration under water-stress (ETr) was 2.6 mm.day-1, while mean evapotranspiration under water-abundance (ETp) was 2.8 mm.day-1. Higher evapotranspiration rates were observed during summer, increasing the substrate storage capacity, although ETr amount along the seasons was very similar, mainly affected by climatic conditions. The long-term analysis showed that 47% of the total rainfall was converted into runoff, 21% was retained in the green roof modules and 32% was released through evapotranspiration, reinforcing the importance of vegetation as a mechanism for improving stormwater control benefits. The results of this research also allowed the establishment of a crop coefficient (Kc) time series, with a monthly average of 0.9 which permits the S. rupestre evapotranspiration to be preliminarily estimated by using equations developed for reference culture without the need of monitoring.","PeriodicalId":54151,"journal":{"name":"RBRH-Revista Brasileira de Recursos Hidricos","volume":"24 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78716662","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}

引用次数: 4

Increasy eutrophication symptoms during a prolonged drought event in tropical semi-arid reservoirs, Brazil 在巴西热带半干旱水库长期干旱事件期间，富营养化症状增加

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RBRH-Revista Brasileira de Recursos Hidricos Pub Date : 2021-01-01 DOI: 10.1590/2318-0331.262120210097

D. Santos, Jonathan Gonçalves da Silva, V. Becker

{"title":"Increasy eutrophication symptoms during a prolonged drought event in tropical semi-arid reservoirs, Brazil","authors":"D. Santos, Jonathan Gonçalves da Silva, V. Becker","doi":"10.1590/2318-0331.262120210097","DOIUrl":"https://doi.org/10.1590/2318-0331.262120210097","url":null,"abstract":"ABSTRACT Eutrophication is a global problem and an important cause of the ecological health degradation of aquatic ecosystems. The aim was to evaluate the effect of prolonged drought period (2012 to 2019) on the trophic state of two Brazilian semi-arid reservoirs, Boqueirão de Parelhas (BOQ) and Passagem das Traíras (TRA). The work was carried out according to a drought classification system, based on the Standardized Precipitation Index (SPI), with an aggregated timescale of 36 months, defining three periods. In the Period I, higher values of Secchi and lower values of turbidity, solids, nutrients and chlorophyll-a were registered, when compared to the other periods, mainly in BOQ. The principal component analyses of both reservoirs reveled a showed a temporal trend of the sample units according to the consequences of the prolonged drought. The results indicated changes in limnological variables due to the reduction of accumulated water volume, and they demonstrated that prolonged droughts impact the intensification of eutrophication in both systems. The trophic state of the BOQ reservoir was changed from mesotrophic to eutrophic as a consequence of the drought, while in TRA the eutrophic state remained, but with more intensified symptoms, with higher concentration values of nutrients, solids and algal biomass.","PeriodicalId":54151,"journal":{"name":"RBRH-Revista Brasileira de Recursos Hidricos","volume":"270 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76280666","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}

引用次数: 5

Effect of hydraulic and geometric factors upon leakage flow rate in pressurized pipes 水压和几何因素对加压管道泄漏流量的影响

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RBRH-Revista Brasileira de Recursos Hidricos Pub Date : 2021-01-01 DOI: 10.1590/2318-0331.262120210057

Mayara Francisca da Silva, F. V. Gonçalves, J. Janzen

引用次数: 2