scholarly journals TAXAS DE ASSOREAMENTO E A INFLUÊNCIA ANTRÓPICA NO CONTROLE DA SEDIMENTAÇÃO DA BAÍA DE ANTONINA - PARANÁ

2003 ◽  
Vol 53 ◽  
Author(s):  
Lydio Luiz Rissetti Odreski ◽  
Carlos Roberto Soares ◽  
Rodolfo José Angulo ◽  
Rafaela Cristine Zem
Keyword(s):  
Sedimentation Rate ◽  
Historical Survey ◽  
River Catchment ◽  
Serra Do Mar ◽  
Sediment Volume ◽  
Significant Acceleration ◽  
Catchment Areas ◽  
Periodic Maintenance ◽  
Anthropic Influence ◽  
Total Sediment

A manutenção dos canais de navegação que acessam os portos organizados de Paranaguá e Antonina, por meio das operações de dragagens e despejo de material dragado, constituem uma atividade onerosa para os portos e impactante para o meio ambiente. Este estudo procurou oferecer uma contribuição ao conhecimento da dinâmica batimétrica da Baía de Antonina, correlacionando levantamentos históricos de batimetria com dados mais recentes. O resultado desta comparação evidenciou um intenso assoreamento da Baía de Antonina, principalmente na porção superior e nas margens, onde se constatou progradação das planícies de maré. O volume de sedimento depositado no período entre 1901 e 1979 foi cerca de 60 x 10 (elevado a 6) m3 , caracterizando uma taxa de sedimentação de aproximadamente 2,6 cm/ano. A influência antrópica exercida pela interligação das bacias de drenagem dos rios Capivari e Cachoeira para a construção de uma usina hidroelétrica, do desmatamento da Serra do Mar na região das cabeceiras dos rios e das atividades de dragagens e despejo de material dragado, parece ter tido uma contribuição significativa na aceleração do processo de colmatação deste setor do Complexo Estuarino de Paranaguá. SILTING RATE AND THE ANTHROPIC INFLUENCE ON THE SEDIMENTATION PROCESS OF ANTONINA BAY - PARANÁ Abstract The maritime channel that yields access to Paranaguá and Antonina harbours requires periodic maintenance of its security maritime depth. That maintenance requires dredging and disposal operations. This study aims at increasing the knowledge of the bathymetric dynamics of Antonina Bay, correlating historical survey data to actual data. The results of this comparison show an intense shoaling on Antonina Bay, mainly on the upper portion and on the margins, where extensive tidal flats have developed. The total sediment volume deposited in the period between 1901 and 1979 was around 60 x 10 (raised the 6) m3 , reflecting a sedimentation rate of approximately 2,6 cm/year. Anthropic influence such as the connection between the rivers Capivari and Cachoeira for hydroelectric purposes, deforestation on river catchment areas at Serra do Mar, and activities of dredging and disposal, hints at a significant acceleration of the silting process of this portion of the Paranaguá Bay Estuarine Complex.

scholarly journals Remote Sensing of Snow Cover Variability and Its Influence on the Runoff of Sápmi’s Rivers

Geosciences ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 130
Author(s):  
Sebastian Rößler ◽  
Marius S. Witt ◽  
Jaakko Ikonen ◽  
Ian A. Brown ◽  
Andreas J. Dietz
Keyword(s):  
Remote Sensing ◽  
Snow Cover ◽  
Air Temperature ◽  
Kendall Test ◽  
The Arctic ◽  
Boreal Winter ◽  
Snowmelt Runoff ◽  
River Catchment ◽  
Catchment Areas ◽  
Runoff Model

The boreal winter 2019/2020 was very irregular in Europe. While there was very little snow in Central Europe, the opposite was the case in northern Fenno-Scandia, particularly in the Arctic. The snow cover was more persistent here and its rapid melting led to flooding in many places. Since the last severe spring floods occurred in the region in 2018, this raises the question of whether more frequent occurrences can be expected in the future. To assess the variability of snowmelt related flooding we used snow cover maps (derived from the DLR’s Global SnowPack MODIS snow product) and freely available data on runoff, precipitation, and air temperature in eight unregulated river catchment areas. A trend analysis (Mann-Kendall test) was carried out to assess the development of the parameters, and the interdependencies of the parameters were examined with a correlation analysis. Finally, a simple snowmelt runoff model was tested for its applicability to this region. We noticed an extraordinary variability in the duration of snow cover. If this extends well into spring, rapid air temperature increases leads to enhanced thawing. According to the last flood years 2005, 2010, 2018, and 2020, we were able to differentiate between four synoptic flood types based on their special hydrometeorological and snow situation and simulate them with the snowmelt runoff model (SRM).

scholarly journals The Mediterranean coastal areas from watershed to the sea: interactions and changes

2007 ◽  
Keyword(s):  
European Commission ◽  
Information Flow ◽  
Sustainable Management ◽  
Integrated Approach ◽  
Coastal Areas ◽  
Coastal Zones ◽  
Multidisciplinary Research ◽  
River Catchment ◽  
International Conference ◽  
Catchment Areas

This volume presents the Proceedings of the International Conference of the MEDCORE project held in Florence, Italy, in November 2005. The MEDCORE project "From river catchment areas to the sea: a comparative and integrated approach to the ecology of Mediterranean coastal zones for sustainable management", funded by the European Commission, was carried out from 2002 to 2005 by a consortium of researchers from European and Mediterranean partner countries. It focused on coastal areas, with particular attention to the interactions and links between the elements. The approach was characterised by multidisciplinary research and integration of expertise. This book contributes to the information flow originated by the project and the conference. Despite the variety of the contributions, they have been gathered into this single volume to construct a baseline for an innovative interdisciplinary perspective.

scholarly journals Suitability Conservation Types Analysis of Panglima Besar Soedirman Reservoir

2019 ◽  
Vol 280 ◽  
pp. 01006
Author(s):  
Widodo Brontowiyono ◽  
Rizal Kartika Wardhana ◽  
Dhandhun Wacano
Keyword(s):  
Sedimentation Rate ◽  
Analytical Hierarchy Process ◽  
River Flow ◽  
High Rate ◽  
Average Sedimentation Rate ◽  
Critical Phase ◽  
Structural Conservation ◽  
Hierarchy Process ◽  
Total Sediment

Mrica Reservoir located in Banjarnegara Regency is amultipurpose reservoir. Based on the report of PT Indonesia Power UnitPembangkitan (UP) Mrica in 2016, the sediment of Mrica Reservoir hasentered the critical phase as it reached 114.25 million m3 and the value ofland-cover index of Mrica reservoir was 80% of the total watershed areawith the average sedimentation rate reaching 4.09 million m3 per year. Itis estimated that the reservoir will be full of sediment by 2021. The maincause of the high rate of sedimentation in Mrica reservoir is the changes inland use and agricultural-plantation activities in the upper river areas andalong the river flow of Serayu River, Merawu River, and Lumajang River. This study aimed to determine the appropriate type of conservation forMrica Reservoir. The method used was the Analytical Hierarchy Process(AHP), in which the determination of conservation efforts was based onsecondary data and observation. According to the current condition ofMrica Reservoir, the planned conservation efforts include two types, namely non-structural conservation and structural conservation. If theconservation begins in 2019, the total sediment in 2021 will decrease to74% and it is predicted that the sediment will be exhausted by 2056.

scholarly journals Reservoir sedimentation impact downstream in a semi-arid basin with greenhouses cultivation

2018 ◽  
Vol 40 ◽  
pp. 03006
Author(s):  
Sergio Arjona ◽  
Agustín Millares ◽  
Asunción Baquerizo
Keyword(s):  
Water Volume ◽  
Medium Term ◽  
Rainfall Events ◽  
Structural Problems ◽  
Sediment Volume ◽  
Term Basis ◽  
Points Of View ◽  
To Come ◽  
Total Sediment

This work analyzes the loss of storage, in a medium-term basis, of Beninar reservoir (Almería, Spain) built in a semiarid watershed and its consequences downstream. The reservoir, in the Adra river basin (Southern Spain), was designed to supply water for the irrigation of more than 28.000 hectares of greenhouses. Its storage volume, that was initially of 68 hm3 in 1984, has been reduced approximately to half. The total sediment volume arrived to the reservoir during the last 32 years is 6,8 hm3, of which 1,68 hm3 are estimated to come from fluvial contributions. The results remark the torrential nature of rainfall events for generating large sediment contributions and highlights the importance of taking into account these types of events. The total loss of storage is especially relevant from two points of view 1) reduction of flood abatement due to sedimentation and structural problems of dam, which has left only 2 hm3 of regulation capacity and 2) loss of water volume which is essential to improve the water quality of the overexploited and salinized aquifers which supply the greenhouses downstream. Beninar reservoir is a key infrastructure to preserve a competitive price of water for greenhouse cultivation.

Bedload dynamics in the rapidly changing paraglacial zone of a high alpine catchment

2020 ◽  
Author(s):  
Clemens Hiller ◽  
Kay Helfricht ◽  
Gabriele Schwaizer ◽  
Severin Hohensinner ◽  
Kerstin Wegner ◽  
...  
Keyword(s):  
Bedload Transport ◽  
Sediment Flux ◽  
High Mountain ◽  
Channel Network ◽  
Scientific Debate ◽  
Coarse Sediment ◽  
Sediment Volume ◽  
Mountain Environments ◽  
Fluvial Transport ◽  
Catchment Areas

<p>High mountain environments have been confronted with rising temperatures and geomorphological changes over the past 150 years, with the considerable retreat of glaciers constituting one of the most pronounced impacts in the Alps. Concurrent degradation of permafrost in headwalls exposed from the downwasting ice and in periglacial hillslopes alongside glaciers causes increasing sediment flux onto glacier surfaces. The accumulation of supraglacial debris at the current glacier tongue promotes water-storage in debris-covered ice bodies and is assessed as an important source of sediment in the proglacial zone, since a close connection to the fluvial channel network can be assumed. The evolution of mountain streams, the degree of connectivity and conditional sedimentation-erosion effects significantly determine the dynamics in a generally unstable paraglacial landscape in which retreating glaciers provide high stream discharges while sediment is widely unconsolidated.</p><p>In the recent scientific debate, the anticipated progressive shift from supply-limitation (fluvial transport overcapacity) to transport-limitation (abundance of sediment) in high alpine catchment areas is discussed. Thus, this study intends to contribute by investigating the connection of coarse sediment including supraglacial debris from the proglacial transition zone to downstream fluvial transport. Key aspect is the feedback between increasing debris cover and a shifting runoff regime due to a changing composition of glacier melt, snow melt and heavy rainfall events. In that respect, the focus will be on the dynamics of bedload transport and the proglacial coarse sediment budget.</p><p>This study is part of the Hidden.Ice project and conducts in-depth monitoring of the connectivity, runoff measurements and geomorphological surveys at the LTER site Jamtalferner, Silvretta Range, Austria. Hydraulic modelling of the potential transport capacity supported by bedload trap measurements, the analysis of grain size distribution in the proglacial area and sediment volume changes calculated from UAV-based photogrammetry are aimed at raising knowledge on hydrological and geomorphological dynamics.</p>

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