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Event-based hydrology and sedimentation in paired watersheds under commercial eucalyptus and grasslands in the Brazilian Pampa biome

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International Soil and Water Conservation Research 2021年第2期9卷 180-194页

作者： Ederson Diniz Ebling Jose Miguel Reichert jhon jairo zuluaga pelaez Miriam Fernanda Rodrigues Mirian Lago Valente Rosane Barbosa Lopes Cavalcante Paolo Reggiani Raghavan Srinivasan Soils Department Universidade Federal de Santa MariaAvenida Roraima1000 Bairro CamobiSanta MariaRS97105-900Brazil Corporacion Colombiana de Investigacion Agropecuaria(AGROSAVIA) Centro de Investigacion NataimaEspinalColombia CMPC Celulose Riograndense Rua Sao Geraldo1680GuaibaRS92500-000Brazil Department of Civil Engineering University of SiegenPaul Bonatz Strasse 9-11Siegen D57068Germany Department of Ecology and Conservation Biology Texas A&M University(TAMU)534 John Kimbrough Blvd.Room 305College StationTX77843-2120USA Current address:Instituto Tecnologico Vale.Rua Boaventura da Silva 955UmarizalBelemPABrazil.

Ecological and hydrological impacts are expected when watersheds are under commercial *** this study we evaluated event-based hydrology and sedimentation in paired watersheds under commercial eucalyptus and grasslands ***,suspended sediment concentration,and sediment production were measured and simulated with the Limburg Soil Erosion Model(LISEM)in paired hydrographic watersheds located in southern Brazil;one occupied with 7-years old Eucalyptus saligna plantation(forest watershed-FW;0.83 km^(2))and another Pampa biome with native and exotic grasses used for beef cattle production(grassland watershed-GW;1.10 km^(2)).The effect of rainfall on hydrological and sedimentological variables was more evident in GW compared with *** shape of the hydrograph was steepest in GW,with rapid,marked increase and decrease in flow during *** parameters changed for model calibration in FW and GW were soil saturated hydraulic conductivity,initial soil moisture,and Manning roughness coefficient,whereby the statistical performance was classified as good(NSE>0.75).Fourteen events different from those used in the calibration process were validated for FW and GW,with NSE index classified as“good”and“very good”for *** study shows limitations of LISEM in calibrating and validating the sediment yield for individual events due to the spatial variability of factors controlling soil *** validated modeling results of this study may be applied in simulating soil and crop scenarios in watersheds cultivated with commercial forest and grassland for grazing.

关键词： Southern grasslands Paired watersheds Runoff Erosion LISEM

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The Zhou’s Method for Solving the Euler Equidimensional Equation

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Applied Mathematics 2016年第17期7卷 2165-2173页

作者： Pedro Pablo Cárdenas Alzate jhon jairo León Salazar Carlos Alberto Rodríguez Varela Department of Mathematics and GEDNOL Universidad Tecnológica de Pereira Pereira Colombia Department of Mathematics Universidad Tecnológica de Pereira Pereira Colombia

In this work, we apply the Zhou’s method [1] or differential transformation method (DTM) for solving the Euler equidimensional equation. The Zhou’s method may be considered as alternative and efficient for finding the approximate solutions of initial values problems. We prove superiority of this method by applying them on the some Euler type equation, in this case of order 2 and 3 [2]. The power series solution of the reduced equation transforms into an approximate implicit solution of the original equations. The results agreed with the exact solution obtained via transformation to a constant coefficient equation.

关键词： Zhou’s Method Equidimensional Equation Euler Equation DTM

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Solid Waste Characterization, Fats and Oils in Two Tourist Resorts Cartagena Colombia

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Journal of Environmental Protection 2013年第8期4卷 1-4页

作者： Claudia Diaz Mendoza Juan Carlos Valdelamar jhon jairo Jimenez Gilma Rosa Avila Fundacion Universitaria Tecnologico Comfenalco Colombia Cartagena Colombia.

The objective of the proposed work was collecting samples continuously, once a month, for a period of two years, it was conducted to determine the types of solid waste generated and deposited in the sand of the tourist beaches, finding that there is predominance waste plastics, cigarette butts and organic debris, other parameter analyzed was determination of fats and oils in sand whose results indicate that the levels found are above the detection limit. In conclusion we have that solid waste types commonly arranged in the sand are plastic, the presence of fats and oils in the sand affect the environmental quality of the beach.

关键词： Waste Sand Beaches Fats Quality

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为2759名热带雨林居民架起通信的桥梁

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21世纪商业评论 2012年第21期 102-102页

作者： jhon jairo Monedero 华为

2010年4月哥伦比亚奴基热带雨林不通公路,也不具备空运条件。我们人拉肩扛,克服丛林的炎热和道路的荆棘,将通信基站搬运上山,为当地2759名居民架起通信的桥梁。

关键词：热带雨林地球之肺热带林人拉肩扛

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