Environmental Management of the Puyango–Tumbes River Basin in Ecuador and Peru

Author(s):  
Napoleon Puño
1994 ◽  
Vol 30 (5) ◽  
pp. 135-145 ◽  
Author(s):  
D. W. Rodda

The Programme has the objective of providing a regional approach to environmental management in the Danube River Basin where there is great pressure from a diverse range of human activities. Serious pollution problems exist from urban populations, from industry, and from intensive agricultural practices. Although the water quality of the main Danube river is probably better than the Rhine because of its greater flow, the same is not the case in the tributaries where there the problems are more serious. A factor which makes a compelling case for a regional approach is the deterioration of the Black Sea into which the main Danube river discharges significant loads of nutrients and a range of non-degradable contaminants. The application of limited financial resources will require fine judgement about the high priority pollution sources that will lead to cost-effective improvements. This action, and other technical assistance, also requires a considerable effort to strengthen the organisations having responsibility for environmental management, and to develop effective public participation. The paper emphasises the water pollution problems in the river basin.


2020 ◽  
Vol 13 (6) ◽  
pp. 3060
Author(s):  
Suelen Crispim Sutil ◽  
José Augusto Costa Gonçalves ◽  
Eliane Maria Vieira

A avaliação da fragilidade ambiental das bacias hidrográficas vem se tornando cada vez mais importante no cenário ambiental, devido ao desenvolvimento gradativo da sociedade e a expansão tecnológica e econômica ao longo dos anos. Uma estratégia adotada para amenizar a degradação e restabelecer o equilíbrio, é a formação de corredores ecológicos (CEs), que auxilia na ligação entre remanescentes naturais. A bacia do rio Piracicaba passa por um longo histórico de degradação e de fragmentação florestal, principalmente próximo às cidades devido ao desmatamento de matas ciliares. Em vista disso, este trabalho analisou e comparou a aplicação de dois diferentes modelos de fragilidade ambiental, aplicada a esta bacia e, a partir de seus produtos identificou a melhor metodologia base para a proposição de corredores ecológicos na região. Com os resultados obtidos, foi possível inferir que, além de grande parte da bacia apresentar grau de fragilidade entre fraco e médio, as áreas mais vulneráveis são aquelas mais próximas à cabeceira da bacia. O estabelecimento dos corredores ecológicos abrangeu, prioritariamente, as áreas de maior fragilidade entre a conexão dos fragmentos de vegetação e as Áreas de Preservação Permanentes (APPs), assim, verificou-se que é necessário o reflorestamento de cerca de 342,24 km² das APPs da bacia para que seja possível a conexão entre as remanescentes e 2,0 km²  de áreas de ligação. Comparative analysis of the environmental fragility of the Piracicaba river basin using two methodological models: support for the application and proposition of Biological Corridors A B S T R A C TThe assessment of a river basin’s environmental fragility has become even more important on the environmental scenery due to society’s gradual development and technological and economic expansion over the years. An adopted strategy to ease the degradation and restore the ecological balance is the establishment of biological corridors that can assist the connection between natural forest patches. The Piracicaba river basin has been going through a long history of degradation and forest fragmentation, especially near the cities because of the deforestation of riparian forests. Therefore, this paper analyzed and compared the application of two adapted environmental fragility models in this river basin and identified from their products the best base methodology for the proposition of ecological corridors. From the results, it was possible to infer that, in addition to a big part of the basin present poor and average fragility level, the most vulnerable areas are the ones close to the source of the main rivers. The biological corridors establishment covered, primarily, the most vulnerable areas between the fragments of remaining forests and the Permanent Preservation Areas (PPAs) and, from this, it was possible to verify that the reforestation of around 132,14 mi² of PPAs is necessary for the connection of patches of remaining forests and 0,77 mi² of connections areas.Keywords: environmental vulnerability, geoprocessing, environmental management.


2022 ◽  
Vol 14 (2) ◽  
pp. 927
Author(s):  
Zhanna Buryak ◽  
Fedor Lisetskii ◽  
Artyom Gusarov ◽  
Anastasiya Narozhnyaya ◽  
Mikhail Kitov

The quantitative and qualitative depletion of water resources (both surface and groundwater) is closely related to the need to protect soils against degradation, rationalization of land use, and regulation of surface water runoff within the watershed area. Belgorod Oblast (27,100 km2), one of the administrative regions of European Russia, was chosen as the study area. It is characterized by a high activity of soil erosion (the share of eroded soils is about 48% of the total area of arable land). The development phase of the River Basin Environmental Management Projects (217 river basins from the fourth to seventh order) allowed for the proceeding of the development of an integrated monitoring system for river systems and river basin systems. The methods used to establish a geoecological network for regional monitoring include the selection and application of GIS techniques to quantify the main indicators of ecological state and predisposition of river basins to soil erosion (the share of cropland and forestland, the share of the south-oriented slopes, soil erodibility, Slope Length and Steepness (LS) factor, erosion index of precipitation, and the river network density) and the method of a hierarchical classification of cluster analysis for the grouping of river basins. An approach considering the typology of river basins is also used to expand the regional network of hydrological gauging stations to rationalize the national hydrological monitoring network. By establishing 16 additional gauging stations on rivers from the fourth to seventh order, this approach allows for an increase in the area of hydro-agroecological monitoring by 1.26 times (i.e., up to 77.5% of the total area of Belgorod Oblast). Some integrated indicators of agroecological (on the watershed surface) and hydroecological (in river water flow) monitoring are proposed to improve basin environmental management projects. Six-year monitoring showed the effectiveness of water quality control measures on an example of a decrease in the concentrations of five major pollutants in river waters.


2015 ◽  
Vol 18 (1) ◽  
pp. 211-228 ◽  
Author(s):  
Rodrigo Constante Martins

This article addresses the themes of inequality and difference in water governance in Brazil. The production of hierarchies in the arenas of governance is discussed, defending the hypothesis that the shift from difference to inequality is the result of practices of justification that consolidate the sovereignty of technical competence in environmental management. Some of the more significant findings of studies about the structure and functioning of River Basin Committees in different regions of the country are taken as reference for this discussion. Based on these findings, we discuss the discursive production of the Committees, the authority of the agents that embody the new principles of management, and the implications of the process of scientification of the politics. The article concludes by pointing out the importance of diversity in the construction of a new narrative of environmental governance.


Author(s):  
Pedro Luiz Teixeira Camargo ◽  
Marcílio Baltazar Teixeira ◽  
Paulo Pereira Martins Junior ◽  
Fernando Antônio Madeira ◽  
Raphaella Karla Portes Beserra

Managing natural resources responsibly is undoubtedly one of the biggest environmental management challenges. Thus, interpolation methods for generating Digital Elevation Models - DEM have been frequently used to help people make decisions. This study was carried out in the Northwest (B) bank of the municipality of São Francisco, North of Minas Gerais, located in the upper-middle São Francisco River basin, where the natural Cerrado suffered intense degradation in the 41 year interval (1975-2016). The aim of the project was to generate a map capable of presenting the populational average of Sucupira (Schinopsis brasiliensis) per collection point. We used overlapping cartographic images and the IDW tool of Arcgis 10.2 software. After the successful methodological experience presented in this article, results indicate that the overlapping mapping performed here shows Sucupira (Schinopsis brasiliensis) present basically throughout the studied margin, with the exception of the East and West ends. It is possible to highlight, however, a significant population growth in the South, exactly where the main water bodies of the place are, indicating that even though it is adapted to the entire study area, the species has a preference for humid regions. Further studies are suggested about the hypothesis proposed here for the distribution of the species throughout the Northwest region of the municipality of São Francisco.


2021 ◽  
pp. 837-846
Author(s):  
Siamak Aram ◽  
Maria H. Rivero ◽  
Nikesh K. Pahuja ◽  
Roozbeh Sadeghian ◽  
Joshua L. Ramirez Paulino ◽  
...  

1996 ◽  
Vol 33 (4-5) ◽  
pp. 117-126 ◽  
Author(s):  
Atsushi Ichiki ◽  
Kiyoshi Yamada ◽  
Toshiyuki Ohnishi

The objectives of this study are to establish a runoff model and show profiles of pollutant runoff by simulating the change in runoff load with variance in the characteristics of river basins (i.e. population, urban area, rate of sewerage, etc.). The model, hereinafter referred to as “MACRO MODEL”, consists of three main sections. The first one shows pollutant runoff from point sources taking into consideration the sedimentation of pollutants in sewers. The second and third ones show pollutant runoff from nonpoint sources in an urban and rural area taking land use into consideration. Since it was proved that MACRO MODEL could simulate runoff load accurately enough to predict profiles of pollutant runoff, it has become possible to estimate the effect of characteristics of a river basin on pollutant runoff. As a result, some available knowledge concerned with the environmental management of water was obtained by using MACRO MODEL.


2006 ◽  
Vol 88 (3) ◽  
pp. 617-631 ◽  
Author(s):  
Michio Watanabe ◽  
Richard M. Adams ◽  
Junjie Wu

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