RBRH-Revista Brasileira de Recursos Hidricos最新文献

{"title":"Revision of <i>Belvosia</i> Robineau-Desvoidy (Diptera, Tachinidae) and 33 new species from Area de Conservación Guanacaste in northwestern Costa Rica with a key to known North and Mesoamerican species.","authors":"A J Fleming, Norman Woodley, M Alex Smith, Winnie Hallwachs, Daniel H Janzen","doi":"10.3897/BDJ.11.e103667","DOIUrl":"10.3897/BDJ.11.e103667","url":null,"abstract":"&lt;p&gt;&lt;strong&gt;Background: &lt;/strong&gt;This revision is part of a continuing series of taxonomic work aimed at the description of new taxa and the redescription of known taxa of the Tachinidae of Area de Conservación Guanacaste in northwestern Costa Rica. Here we describe 33 new species in the genus &lt;i&gt;Belvosia&lt;/i&gt; Robineau-Desvoidy, 1830 (Diptera: Tachinidae). All species described here were reared from this ongoing inventory of wild-caught caterpillars spanning a variety of families (Lepidoptera: Erebidae, Eupterotidae, Noctuidae, Notodontidae, Saturniidae, and Sphingidae). We provide a morphological description of each species with limited information on life history, molecular data, and photographic documentation. In addition to the new species, the authors provide a redescription of the genus &lt;i&gt;Belvosia&lt;/i&gt;, as well as provide a key to the identification of the species present in the Meso- and North-American fauna.&lt;/p&gt;&lt;p&gt;&lt;strong&gt;New information: &lt;/strong&gt;The following 33 new species of &lt;i&gt;Belvosia&lt;/i&gt; Robineau-Desvoidy, 1830, all authored by Fleming & Woodley, are described: &lt;i&gt;Belvosiaadrianguadamuzi&lt;/i&gt; Fleming & Woodley &lt;b&gt;sp. n.&lt;/b&gt;, &lt;i&gt;Belvosiaanacarballoae&lt;/i&gt; Fleming & Woodley &lt;b&gt;sp. n.&lt;/b&gt;, &lt;i&gt;Belvosiaangelhernandezi&lt;/i&gt; Fleming & Woodley &lt;b&gt;sp. n.&lt;/b&gt;, &lt;i&gt;Belvosiabrigittevilchezae&lt;/i&gt; Fleming & Woodley &lt;b&gt;sp. n.&lt;/b&gt;, &lt;i&gt;Belvosiaalixtomoragai&lt;/i&gt; Fleming & Woodley &lt;b&gt;sp. n.&lt;/b&gt;, &lt;i&gt;Belvosiacarolinacanoae&lt;/i&gt; Fleming & Woodley &lt;b&gt;sp. n.&lt;/b&gt;, &lt;i&gt;Belvosiaciriloumanai&lt;/i&gt; Fleming & Woodley &lt;b&gt;sp. n.&lt;/b&gt;, &lt;i&gt;Belvosiadiniamartinezae&lt;/i&gt; Fleming & Woodley &lt;b&gt;sp. n.&lt;/b&gt;, &lt;i&gt;Belvosiaduniagarciae&lt;/i&gt; Fleming & Woodley &lt;b&gt;sp. n.&lt;/b&gt;, &lt;i&gt;Belvosiaduvalierbricenoi&lt;/i&gt; Fleming & Woodley &lt;b&gt;sp. n.&lt;/b&gt;, &lt;i&gt;Belvosiaeldaarayae&lt;/i&gt; Fleming & Woodley &lt;b&gt;sp. n.&lt;/b&gt;, &lt;i&gt;Belvosiaeliethcantillanoae&lt;/i&gt; Fleming & Woodley &lt;b&gt;sp. n.&lt;/b&gt;, &lt;i&gt;Belvosiafreddyquesadai&lt;/i&gt; Fleming & Woodley &lt;b&gt;sp. n.&lt;/b&gt;, &lt;i&gt;Belvosiagloriasihezarae&lt;/i&gt; Fleming & Woodley &lt;b&gt;sp. n.&lt;/b&gt;, &lt;i&gt;Belvosiaguillermopereirai&lt;/i&gt; Fleming & Woodley &lt;b&gt;sp. n.&lt;/b&gt;, &lt;i&gt;Belvosiaharryramirezi&lt;/i&gt; Fleming & Woodley &lt;b&gt;sp. n.&lt;/b&gt;, &lt;i&gt;Belvosiahazelcambroneroae&lt;/i&gt; Fleming & Woodley &lt;b&gt;sp. n.&lt;/b&gt;, &lt;i&gt;Belvosiajorgehernandezi&lt;/i&gt; Fleming & Woodley &lt;b&gt;sp. n.&lt;/b&gt;, &lt;i&gt;Belvosiajosecortezi&lt;/i&gt; Fleming & Woodley &lt;b&gt;sp. n.&lt;/b&gt;, &lt;i&gt;Belvosiajoseperezi&lt;/i&gt; Fleming & Woodley &lt;b&gt;sp. n.&lt;/b&gt;, &lt;i&gt;Belvosiakeinoraragoni&lt;/i&gt; Fleming & Woodley &lt;b&gt;sp. n.&lt;/b&gt;, &lt;i&gt;Belvosialuciariosae&lt;/i&gt; Fleming & Woodley &lt;b&gt;sp. n.&lt;/b&gt;, &lt;i&gt;Belvosiamanuelpereirai&lt;/i&gt; Fleming & Woodley &lt;b&gt;sp. n.&lt;/b&gt;, &lt;i&gt;Belvosiamanuelriosi&lt;/i&gt; Fleming & Woodley &lt;b&gt;sp. n.&lt;/b&gt;, &lt;i&gt;Belvosiaminorcarmonai&lt;/i&gt; Fleming & Woodley &lt;b&gt;sp. n.&lt;/b&gt;, &lt;i&gt;Belvosiaosvaldoespinozai&lt;/i&gt; Fleming & Woodley &lt;b&gt;sp. n.&lt;/b&gt;, &lt;i&gt;Belvosiapabloumanai&lt;/i&gt; Fleming & Woodley &lt;b&gt;sp. n.&lt;/b&gt;, &lt;i&gt;Belvosiapetronariosae&lt;/i&gt; Fleming & Woodley &lt;b&gt;sp. n.&lt;/b&gt;, &lt;i&gt;Belvosiaricardocaleroi&lt;/i&gt; Fleming & Woodley &lt;b&gt;sp. n.&lt;/b&gt;, &lt;i&gt;Belvosiarobertoespinozai&lt;/i&gt; Fleming & Woodley &lt;b&gt;sp. n.&lt;/b&gt;, &lt;i&gt;Belvosiarostermoragai&lt;","PeriodicalId":54151,"journal":{"name":"RBRH-Revista Brasileira de Recursos Hidricos","volume":"21 1","pages":"e103667"},"PeriodicalIF":1.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10848636/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89808439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Density and classification of the rainfall network and spatiotemporal analysis of rain in the upper Parana river region, Brazil","authors":"Eduarda Noriko Tokuda, C. G. R. Lima, Milton Dall’Aglio Sobrinho, Jefferson Nascimento de Oliveira","doi":"10.1590/2318-0331.282320220101","DOIUrl":"https://doi.org/10.1590/2318-0331.282320220101","url":null,"abstract":"ABSTRACT Water management aims to ensure the water availability necessary to meet the current and future demand for water resources. For which it is essential to implement monitoring networks that support the investigation of events that interfere with the rainfall regime of watersheds, such the phases of the ocean-atmospheric phenomenon El Niño – Southern Oscillation (ENSO). The classification of the rainfall network was proposed according to the World Meteorological Organization (WMO) for 14 management watersheds in the Upper Parana River (UPR) region, Brazil. On the other hand, the spatial and temporal variability of annual rainfall was analyzed using geostatistical techniques and confronted with ENSO data. To this purpose, data from 408 stations were collected via the Hidroweb portal, for the period from 1990 to 2020. The low representativeness of data in the region was verified from the observational network. The areas with the lowest and highest rainfall reduction were the north and northwest regions of the UPR, and the areas surrounding the Paraná River, respectively. The years 2019 and 2020 were identified as the most critical period of the last 3 decades with below-average rainfall (-13.21%) in 49.55% of the studied area, indicating a persistence in the drought scenario.","PeriodicalId":54151,"journal":{"name":"RBRH-Revista Brasileira de Recursos Hidricos","volume":"24 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2023-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83236748","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":"Proposal to use new methods of design and construction in mobile riverbed physical models: the Salto do Paraopeba dam case","authors":"C. B. Martinez, A. Saliba, Edna M. de F. Viana, J. L. Z. Tarqui, E. D. Teixeira, Mary Elma Ferreira Costa, Adriano Silva Bastos","doi":"10.1590/2318-0331.282320220107","DOIUrl":"https://doi.org/10.1590/2318-0331.282320220107","url":null,"abstract":"ABSTRACT The study of the interaction between hydraulic structures in mobile bed river systems is complex because it involves sediment transport and dynamic changes in the boundary conditions, requiring the use of physical models. This article presents the procedure for the design and construction of a physical model of the reservoir and dam of the Small Hydroelectric Power Plant (SHPP) of Salto Paraopeba. In the design phase, computational modelling of sediment transport was used to reconstitute the primitive geometry of the river, and simulations of the flow regime and the transport capacity along the course of the river were also carried out; both results allowed to delimit the model extension. Considering the choice of scale and the similarity criteria between the model and the prototype, the use of a new alternative material was proposed, composed of crushed tire rubber particles, with a lower specific mass and a larger diameter than the prototype's sediment. In the construction phase, a new constructive method of the physical model was applied using fiberglass, the method presents constructive advantages, such as better representation of the morphology, lower weight, simple installation and uninstallation through modules, and simple and fast repairs, among others.","PeriodicalId":54151,"journal":{"name":"RBRH-Revista Brasileira de Recursos Hidricos","volume":"94 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2023-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89838147","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":"Estimation of monthly rainfall missing data in Southwestern Colombia: comparing different methods","authors":"Juan Sebastián Del Castillo-Gómez, T. Canchala, W. A. Torres-López, Y. Carvajal-Escobar, Camilo Ocampo-Marulanda","doi":"10.1590/2318-0331.282320230008","DOIUrl":"https://doi.org/10.1590/2318-0331.282320230008","url":null,"abstract":"ABSTRACT Historical rainfall records are relevant in hydrometeorological studies because they provide information on the spatial features, frequency, and amount of precipitated water in a specific place, therefore, it is essential to make an adequate estimation of missing data. This study evaluated four methods for estimating missing monthly rainfall data at 46-gauge stations in southwestern Colombia covering 1983-2019. The performance of the Normal Ratio (NR), Principal Components Regression (PCR), Principal Least Square Regression (PLSR), and Artificial Neural Networks (ANN) methods were compared using three standardized error metrics: Root Mean Square Error (RMSE), Percent BIAS (PBIAS), and Mean Absolute Error (MAE). The results generally showed a better performance of the nonlinear ANN method. Regarding the linear methods, the best performance was registered by the PLSR, followed by the PCR. The results suggest the applicability of the ANN method in regions with a low density of stations and a high percentage of missing data, such as southwestern Colombia.","PeriodicalId":54151,"journal":{"name":"RBRH-Revista Brasileira de Recursos Hidricos","volume":"85 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2023-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86908318","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":"Modeling water quality in a tropical reservoir using CE-QUAL-W2: handling data scarcity, urban pollution and hydroclimatic seasonality","authors":"I. L. Lima Neto","doi":"10.1590/2318-0331.282320230003","DOIUrl":"https://doi.org/10.1590/2318-0331.282320230003","url":null,"abstract":"ABSTRACT This study applies a 2-D hydrodynamic model (CE-QUAL-W2) for simulating water quality dynamics in a tropical reservoir located in Fortaleza, Ceará, Brazil. While rainfall concentrates basically in the first semester, this reservoir receives untreated sewage from an urban catchment throughout the year. To deal with data scarcity, model simplifications are justified and several adjustments are carried out, so that only the parameters temperature (T), dissolved oxygen (DO), chlorophyll a (Chla) and phosphate (PO4) are kept in the modeling process. Additionally, different assumptions are performed regarding the time-evolution of reservoir inlet concentrations: constant values, step and linear variations. The results indicate that the simplified model can predict well the seasonal variations of T, DO, Chla and PO4. The best fitting between model results and measurements are obtained with the assumption of linear variation in inlet concentrations, followed by the assumptions of constant values and step variation. Moreover, the results reveal that while PO4 presents a complete mixing behavior with a clear increase in concentration from the wet to the dry season, T, DO and Chla show an alternating stratification-destratification patter during the day-night but without relevant variations throughout the year. Model simulations of different scenarios also indicate a significant reduction in Chla concentration in the second semester, but external load reduction has a stronger impact on model outputs than hydroclimatic variability. The modeling approach developed in the present study is proposed as a simple way to cope with data scarcity, urban pollution and hydroclimatic seasonality in tropical reservoirs.","PeriodicalId":54151,"journal":{"name":"RBRH-Revista Brasileira de Recursos Hidricos","volume":"28 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2023-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88408594","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":"Data imputation of water quality parameters through feed-forward neural networks","authors":"L. Peixoto, Bárbara Alves de Lima, Camila de Carvalho Almeida, C. Fernandes, J. Centeno, J. C. D. Azevedo","doi":"10.1590/2318-0331.282320220118","DOIUrl":"https://doi.org/10.1590/2318-0331.282320220118","url":null,"abstract":"ABSTRACT The constant monitoring of water quality is fundamental for the understanding of the aquatic environment, yet it demands great financial investments and is susceptible to inconsistencies and missing values. Using a database composed of 59 sampling campaigns, performed for 12 years, on 10 monitoring stations along the Iguassu River Basin (Southern Brazil), this study presents a model, based on feed-forward neural networks, which imputed 1,370 values for 11 traditional water quality parameters, as well as 3 contaminants of emerging concern (caffeine, estradiol and ethinylestradiol). The model validation errors varied from 0.978 mg L-1 and 0.017 mg L-1 for the traditional parameters, for caffeine the validation error was of 0.212 µg L-1 and for the hormones, the errors were of 0.04 µg L-1 (E1) and 0.044 µg L-1 (EE1). The models underwent two techniques to understand the operations performed within the model (isolation and nullification), which were consistent to those explained by natural processes. The results point to the validity of modeling water quality parameters (especially the concentrations of caffeine) through neural networks, which could lead to better resource allocation in environmental monitoring, as well as improving available datasets and valuing previous monitoring efforts.","PeriodicalId":54151,"journal":{"name":"RBRH-Revista Brasileira de Recursos Hidricos","volume":"48 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2023-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85461235","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":"Uncertainty in groundwater recharge estimation using groundwater level fluctuation and aquifer test","authors":"G. Penner, Rubens Takeji Aoki Araujo Martins, Salim Rodrigues, E. Wendland","doi":"10.1590/2318-0331.282320220113","DOIUrl":"https://doi.org/10.1590/2318-0331.282320220113","url":null,"abstract":"ABSTRACT For sustainable groundwater management the rate of groundwater recharge and specific yield are both of the most important elements in the analysis and management of groundwater resources, and, sometimes, estimation of these parameters remains a challenge. This research presents a combining approach of the water-table fluctuation method (WTF) with an aquifer test to estimate both and quantify their uncertainty. The methodology requires at least three wells: two instrumented observation wells with a level sensor for long-term monitoring and a pump well located nearby for aquifer testing. The test interpretation was supported by the Aqtsolv Demo software obtaining the best fit with the method proposed by Tartakovsky-Neuman, with a specific yield varying, in 2σ, between 9.4% and 10.6%. Recharge was estimated with WTF, and the uncertainty in recharge is obtained by propagating the uncertainties about the specific yield (Bayesian inference) and the groundwater recession dynamics to the WTF. The uncertainty about recharge stems from uncertainty about the specific yield. The approach was applied on the campus of the Federal University of Pará, Belém, Brazil. Recharge was estimated at 1078.9 mm, from 03/sep/2020 to 30/sep/2021, with an associated uncertainty of 129.5 mm in 2σ, which equates to a range between 33.9 and 39.8% in terms of precipitation. Through the use of cost-effective instrumentation and interpretation methodology, replication of that approach can be encouraged to provide reliable estimates of recharge and specific yield in a site specific. Such condition can be useful to reduce the predictive uncertainty of groundwater management.","PeriodicalId":54151,"journal":{"name":"RBRH-Revista Brasileira de Recursos Hidricos","volume":"70 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2023-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86299726","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":"SARDIM: a real-time hydrological monitoring platform of South American rivers","authors":"Gustavo Gabbardo dos Reis, R. Paiva, J. P. Brêda, V. Siqueira","doi":"10.1590/2318-0331.282320220106","DOIUrl":"https://doi.org/10.1590/2318-0331.282320220106","url":null,"abstract":"ABSTRACT Due to the frequent occurrence of extreme hydrological events in the South American rivers, this work aims to develop a hydrological monitoring platform open to the public, with a wide and intuitive access, using resources of an online geographic information system, in order to contribute to a better understanding of the behavior of these natural disasters. SARDIM (South America River DIscharge Monitor) has been developed using programming resources in languages such as Python and JavaScript. The data of the platform are derived from results of a continental scale hydrological simulation model (MGB - South America) that uses, among other information, precipitation data from the GPM (Global Precipitation Measurement) mission and from the MSWEP (Multi-Source Weighted Ensemble Precipitation) product. After a statistical analysis of the model results, the platform is updated daily and operationally, with new data on the flow duration and the return period of river flows, allowing the identification, monitoring and evaluation of the intensity of extreme hydrological events in South America.","PeriodicalId":54151,"journal":{"name":"RBRH-Revista Brasileira de Recursos Hidricos","volume":"1 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2023-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82490660","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":"Hydraulic and economic analysis for rehabilitation of water distribution networks using pipes cleaning and replacement and leakage fixing","authors":"David Antonio Jimenez Osorio, G. Lima, B. Brentan","doi":"10.1590/2318-0331.282320220103","DOIUrl":"https://doi.org/10.1590/2318-0331.282320220103","url":null,"abstract":"ABSTRACT Water distribution networks (WDNs) are designed to operate over a long period, however, it is expected that their capacity reduces over time. The large set of options that can be applied to improve their capacity, combined with their hydraulic complexity and the search for the most economical solution create a difficult problem to solve. Therefore, in this paper the hydraulic and economic benefits of three rehabilitation strategies: pipes cleaning, pipe replacement and leakage fixing. were evaluated individually first and then combined into two case studies, through a cost minimization using the PSO algorithm. Initially, the relation between the investment and the reduction in pressure deficit is analyzed for each alternative to identify the best strategy, and at which point the benefits are saturated. Then, an optimization considering the combination of the three intervention techniques is made to verify if there is a prioritization of any technique, and if it is related with the individual performance. in economic and hydraulic terms pipe replacement was the best intervention technique, followed by pipe cleaning and leak repair. For substitution, few interventions are sufficient to significantly improve the pressure. Moreover, it was observed that in the intervention - combined, the algorithm prioritizes joint solutions.","PeriodicalId":54151,"journal":{"name":"RBRH-Revista Brasileira de Recursos Hidricos","volume":"58 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2023-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80510343","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":"Microplastics in sediments deposited by rainwater runoff in a populated center in the Peruvian Andes","authors":"Franklin Canchari, J. Iannacone","doi":"10.1590/2318-0331.282320220108","DOIUrl":"https://doi.org/10.1590/2318-0331.282320220108","url":null,"abstract":"ABSTRACT Microplastics (MPs) are present in surface sediments deposited on city streets as a result of stormwater runoff. The objective of this study was to determine the abundance and characteristics of MPs in surface sediments deposited by stormwater runoff from the village of Madeán in the Peruvian Andes based on size, shape, and color. Surface sediment samples were collected in triplicate at each of the eight sample sites. The sediments were deposited in some parts of the streets of this village due to the effect of rainwater runoff. The separation of MPs from the sediment was carried out in the laboratory by the density separation method with NaCl solution. The eight sampling sites in Madeán presented 292.91 ± 149.32 (MP Items/Kg of sediment) of MPs, showing significant differences in the abundance of MPs among the different sampling sites. The predominant characteristics of the MPs were small size (SMP) (50.95%) and large size MPs (LMP) (49.05%), being fiber (60.66%) and fragmented (38.39%) in morphology, and blue (29.86%), black (25.59%), and red (23.22%) in color, respectively. The following investigation suggests that solid waste is not being adequately managed by finding the presence of MPs in the sediments that are in the street ditches.","PeriodicalId":54151,"journal":{"name":"RBRH-Revista Brasileira de Recursos Hidricos","volume":"9 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2023-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91258022","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}