Evaluating the effects of zinc chloride as a preservative in cracked table olive packing
Smith, Peter
2011
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11 records were found.
Águeda watershed is a sub-catchement of the Douro river
(northern Portugal) and it is distributed on both Spanish and
Portuguese territories. The main core of this work is the
achievement of a methodological tool able to be used for
vulnerability assessment in ttransboudary watersheds.
Groundwaters’ vulnerability mapping was carried out by
two different methodological approches: DRASTIC and
DRASTIC Pesticide [1].
DRASTIC is a numerical index derived from ratings and
weights assigned to seven parameters – Deep to water, net
Recharge, Aquifer media, Soil media, Topography, Impact of
the vadose zone and hidraulic Conductivity. The obtained
values raises between 23 (not vulnerable) to 230 (highly
vulnerable). Drastic Pesticide uses the same parameters with
the reassignment of attributes’ weights to stress the
importance of agricultural activities.
DRASTIC’s map for Águeda watershed shows three
spatially distributed vulnerability classes: low (102 - 119),
moderate (120 - 139) and moderate to high (140 - 154). The
low vulnerable zones occupy almost 78% of the all area while
the moderate vulnerable zones correspond to 21% of the
remaining area. The moderate to high vulnerable zones
represents less than 1% of the total area and it is localized in
the central part of the Águeda watershed overlapping the
tertiary sedimentary aquifer and the mostly populated area.
DRASTIC Pesticide map shows four spatially distributed
vulnerability classes: low (120 - 139), low to moderate (140 -
159), moderate to high (160 - 179) and high (180 - 195). The
high proportion increases considerably in the central zone of
the Águeda watershed representing more than 20% of the land
parceling.
Although similar hydrogeological intrinsic characteristics
are observed in the central watershed’s area obvious
differences can be stressed when anthropogenic activities are
taken into consideration. Feasibility studies and the
development of specific monitoring activities must be
addressed in future work.
Comunicação oral da qual só está disponível o resumo.
Comunicação oral da qual só está disponível o resumo.
Análise de riscos ambientais em bacias transfronteiriças : projecto-piloto no rio Águeda.
Análise da vulnerabilidade e risco para as águas subterrâneas da bacia do rio Águeda.
Documento originalmente apresentado em International workshop “Uranium, Environment and Public Health”, UrEnv 2013.
Surface water is exposed to contaminants which change the natural hydrological parameters and consequent
contaminant dispersion. Water self-depuration is an ecological process aiming to restore the natural watercourse balance, which depends on the quality and quantity of topical and diffuse contributions. The main goal of this research is the evaluation of surface water quality in the Águeda River (Portugal-Spain transboundary watershed) and its self-depuration ability considering different predicted scenarios. Biochemical oxygen demand (BOD5), dissolved oxygen (DO), dry residue, Ptotal, Ntotal, pH, temperature and microbiological parameters were analyzed, in thirty-six surface water samples. Simulation of different quality scenarios was undertaken using Qual2Kw software and the river's self-depuration ability discussed. The obtained model's calibration achieved a score of 95% confidence interval, for almost analyzed parameters. The calibrated model was used for two prediction scenario construction. The first one, intending to assess the influence of topical contaminated discharge and the second one, aiming to evaluate the influence of minimum flow rates, representing an extremely dry year. The two considered scenarios revealed that self-depuration capacity is more affected by the presence of minimum flow rates than topical discharges, attesting a large potential for self-depuration along the Águeda River.
Teledetección e fotointerpretación para el estudio de la evolución de la cuenca del rio Águeda.
Cohesión cartográfica en proyectos transfronterizos. El proyecto Agueda.
A obra é constituída pelos resumos das comunicações apresentadas pelos docentes da Escola Superior Agrária do Instituto Politécnico de Castelo Branco e são referentes aos projetos de investigação nos quais estão envolvidos.
