The Taim Wetland Conflict: A Compromise Between<i>Environment Conservation and Irrigation</i>

Villanueva, Adolfo; Marques, David da Motta; Tucci, Carlos Eduardo Morelli

doi:10.1080/02508060008686876

Cited by 12 publications

(10 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The water demand for rice irrigation is about 2 l/s/ha, representing *80% of the annual water input into the lagoon. This diminishes the water (Beltrame and Tucci 1998;Villanueva et al 2000). The situation is dramatic because the water pumping coincides with the dry season, when the difference between precipitation and evaporation is -32 mm/month (December), in contrast to +90 mm/month during the wet season (July).…”

Section: Study Areamentioning

confidence: 96%

Major Ion Chemistry in a Freshwater Coastal Lagoon from Southern Brazil (Mangueira Lagoon): Influence of Groundwater Inputs

et al. 2008

View full text Add to dashboard Cite

This paper characterizes major ion distributions and investigates whether groundwater exerts a major control on the chemical functioning of Mangueira Lagoon, a large (90 km long), shallow (*4-5 m deep), and fresh coastal lagoon in southern Brazil. Water volumes equivalent to *80% of the total annual input are used in the summer for irrigating nearby rice plantations, the most important regional economic activity. While Na + and Cl -are the major ions in local groundwater, Na + and HCO 3 -are the most enriched ions in lagoon water. The ion concentrations measured in Mangueira Lagoon were homogeneous, except for a few samples affected by rainwater and groundwater inputs. A shore-normal transect starting at the pump house of a rice irrigation canal indicated strong groundwater input at this canal. In spite of the small volume contribution (*2% of precipitation), groundwater discharge accounts for 50-70% of major ion inputs into the lagoon, with *70% of the groundwater inputs being anthropogenically derived (e.g., from the rice irrigation canals). This may have serious implications for the management of the coastal water resources from Mangueira Lagoon and other similar areas as groundwater associated with agricultural systems may be contaminated by fertilizers and pesticides. The results imply that groundwater should not be neglected in dissolved species' budgets even when its volume contribution is small.

show abstract

Section: Study Areamentioning

confidence: 96%

Major Ion Chemistry in a Freshwater Coastal Lagoon from Southern Brazil (Mangueira Lagoon): Influence of Groundwater Inputs

et al. 2008

View full text Add to dashboard Cite

show abstract

“…A dam was constructed to prevent brackish water from the Patos Lagoon estuary from entering Mirim and Mangueira Lagoons during droughts. Rice irrigation accounts for more than 99% of the total water usage in the Mangueira basin and 80% of the total water inflow into the lagoon (Beltrame and Tucci, 1998;Villanueva et al, 2000). The situation is dramatic because the water pumping coincides with the dry season, when the difference between precipitation and evaporation is À32 mm/month (December), in contrast to +90 mm/month during the wet season (July).…”

Section: Site Descriptionmentioning

confidence: 97%

Tracing anthropogenically driven groundwater discharge into a coastal lagoon from southern Brazil

Santos

Niencheski

Burnett

et al. 2008

Journal of Hydrology

107

View full text Add to dashboard Cite

“…These are interlinked systems, so that water removal for irrigation and the construction of irrigation systems (drainage channels, rising stations, dams) affect the whole system and may cause a reduction in the water volume needed for the maintenance of local ecosystems (BURGER, 2002). The system is more susceptible to hydrologic change during times of heightened evapotranspiration, as observed by Villanueva (2000) to occur during the months of October/November and February/March. During the dry season, water removal from the lagoons increases in order to supply the deficit in precipitation rates.…”

Section: Introductionmentioning

confidence: 99%

“…As this region is a singular place in regard to its high nutrient concentration, and the consequent high fish availability (SEELIGER et al, 2004), a multidisciplinary project is under way, whose aim is described by its own title: "Comparative assessment of the influence of oceanographic patterns on biological production at the continental shelf and slope in two southern Brazilian areas". Villanueva (2000). …”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Evidences of continental groundwater inputs to the shelf zone in Albardão, RS, Brazil

et al. 2008

View full text Add to dashboard Cite

The southern coastal region of Brazil is highly productive and many of its oceanographic processes are still poorly understood due to a great number of forces, such as the continental input from the Plata River and Patos Lagoon, several distinct oceanic water masses, and a complex contribution from groundwater. The shelf near Albardão is highly rich in dissolved nutrients, particularly in the coastal zone. The narrow sandy barrier that separates the ocean from Mangueira Lagoon has led us to wonder about the possibility of groundwater, and if it might play a role in the productivity of the surrounding area. In order to test this hypothesis, nutrient data from Mirim and Mangueira Lagoons and from Albardão were collected during a rainy period. The present work shows the need to include groundwater transport from Mangueira Lagoon to the coastal zone as one of the main sources for the productivity in that region. However, for such phenomenon to be quantified and better understood, it becomes necessary to use natural isotopes as tracers of the underground input. RESUMOA região sul do Brasil é uma área altamente produtiva, cujos processos oceanográficos ainda são pouco compreendidos devido ao grande número de forçantes, tais como aportes continentais do Rio da Prata, Lagoa dos Patos, diferentes massas de água oceânicas e a complexa contribuição da água subterrânea. A plataforma da região do Albardão é extremamente rica em nutrientes dissolvidos, especialmente na zona costeira. O estreito cordão arenoso que separa a região do Albardão da Lagoa Mangueira levou-nos a questionar a possibilidade do transporte de água subterrânea e se este poderia contribuir de forma expressiva na produtividade dessa região. Para testar essa hipótese, associamos dados de nutrientes das Lagoas Mirim e Mangueira a dados inéditos da plataforma da região do Albardão, todos em período de alta precipitação. Este trabalho demonstra a necessidade de incluir o transporte de água subterrânea da Lagoa Mangueira para a região costeira, como uma das principais fontes para o aumento da produtividade da região. Entretanto, para quantificar e compreender melhor este fenômeno faz-se necessário o uso de isótopos naturais como traçadores desses aportes subterrâneos.

show abstract

The Taim Wetland Conflict: A Compromise BetweenEnvironment Conservation and Irrigation

Cited by 12 publications

References 0 publications

Major Ion Chemistry in a Freshwater Coastal Lagoon from Southern Brazil (Mangueira Lagoon): Influence of Groundwater Inputs

Major Ion Chemistry in a Freshwater Coastal Lagoon from Southern Brazil (Mangueira Lagoon): Influence of Groundwater Inputs

Tracing anthropogenically driven groundwater discharge into a coastal lagoon from southern Brazil

Evidences of continental groundwater inputs to the shelf zone in Albardão, RS, Brazil

Contact Info

Product

Resources

About