Reservoir operation and environmental water demand: Scenarios for the Sub-Middle and Lower São Francisco River basin, Brazil

Despite advances in water resources management and planning, the São Francisco River Basin in Brazil has suffered from systematic drought problems in recent years, leading to severe human and environmental water security threats. This paper aims to track the water security for different periods and its relations with the changes in physical and natural asset conditions. The paper explores how investment planning to mitigate the water security threats and explore opportunities to increase the value of investments. The paper finds that grey infrastructure has regulated threats from increasing in the downstream of the river basin, however, continuous increase in water security threats in the upstream of the basin threatens water security downstream. This is evident from the spatial connectivity and unidirection externalities. As the capacity to further increase in grey investment is reaching its limit in the downstream, the increases in green infrastructure investment upstream, especially in the Grande River basin, could be one the way to reduce the externalities and minimise the water security risks.

Download Full-text

Induced reproduction and reproductive characteristics of Rhinelepis aspera Agassiz, 1829 (osteichthyes: Siluriformes, Loricariidae)

Brazilian Archives of Biology and Technology ◽

10.1590/s1516-89131998000300006 ◽

1998 ◽

Vol 41 (3) ◽

pp. 309-314 ◽

Cited By ~ 9

Author(s):

Yoshimi Sato ◽

Nelsy Fenerich-Verani ◽

José Roberto Verani ◽

Hugo Pereira Godinho ◽

Edson Vieira Sampaio

Keyword(s):

Body Weight ◽

Water Temperature ◽

River Basin ◽

Fertilization Rate ◽

Pituitary Extract ◽

Reproductive Characteristics ◽

Sao Francisco River ◽

Absolute Fecundity ◽

São Francisco River

Rhinelepis aspera is the largest Loricariidae species found in the São Francisco river basin where it is now rarely caught. Brooders kept in tanks were hypophysed with crude carp pituitary extract (CCPE). Approximately 82% of the females responded positive to the treatment. The egg was opaque, demersal, round, yellow and adhesive. Egg stripping was done at 212 hour-degrees (= 8.2 h) after application of the second dose of CCPE (water temperature = 25-26 ºC). Hatching of the larvae occurred at 1022 hour-degrees (= 42.2 h), after fertilization of the eggs (water temperature =24-25 ºC). Fertilization rate of the eggs was 72%. Absolute fecundity (AF), initial fertility (IF) and final fertility (FF) in relation to the females' body weight are expressed, respectively, by the equations: AF = - 33993 + 122308 Wt (r² = 0.88), IF = - 14823 + 58619 Wt (r² = 0.71) and FF = - 6553 + 29741 (r² = 0.61)

Download Full-text

Digenea of Hoplias intermedius and Hoplias malabaricus (Actinopterygii, Erythrinidae) from upper São Francisco River, Brazil

Revista Brasileira de Parasitologia Veterinária ◽

10.1590/s1984-29612015038 ◽

2015 ◽

Vol 24 (2) ◽

pp. 129-135 ◽

Cited By ~ 7

Author(s):

Danielle Priscilla Correia Costa ◽

Cassandra Moraes Monteiro ◽

Marilia Carvalho Brasil-Sato

Keyword(s):

River Basin ◽

Feeding Habits ◽

Minas Gerais ◽

New Host ◽

Hoplias Malabaricus ◽

Parasitic Fauna ◽

Sao Francisco River ◽

São Francisco River ◽

New Location

A total of 103 specimens of Hoplias intermedius (Günther, 1864) and 86 specimens of H. malabaricus (Bloch, 1794) from the upper São Francisco River, State of Minas Gerais were collected between April 2011 and August 2013, and their parasitic fauna were investigated. Four species of Digenea were found: metacercariae of Austrodiplostomum sp., and Ithyoclinostomum sp.; and adult specimens of Phyllodistomum spatula Odhner, 1902, and Pseudosellacotyla lutzi (Freitas, 1941) Yamaguti, 1954. The prevalence of the metacercariae was higher than that of the adult digeneans of erythrinids from the upper São Francisco River as a result of piscivorous feeding habits of these adult erythrinids. The presence of metacercariae and adult digeneans indicate that they act as intermediate and definitive hosts, respectively, in their biological cycles. Hoplias intermedius is a new host for the four species of Digenea, and the São Francisco River basin is a new location for the known geographical distributions of P. spatula and P. lutzi.

Download Full-text

Evaluation of Eta Model Rainfall Forecasts at São Francisco River Basin in Minas Gerais, Brazil

Anuário do Instituto de Geociências - UFRJ ◽

10.11137/2015_2_15_23 ◽

2016 ◽

Vol 38 (2) ◽

pp. 15

Author(s):

R. M. G. VIEIRA ◽

C. P. DERECZYNSKI ◽

S. C. CHOU ◽

J. L. GOMES ◽

A. C. PAIVA NETO

Keyword(s):

River Basin ◽

Minas Gerais ◽

Sao Francisco River ◽

São Francisco River ◽

Eta Model

Download Full-text

Evaluation of Ecological Water Consumption in Yanhe River Basin Based on Big Data

Computational Intelligence and Neuroscience ◽

10.1155/2021/2201964 ◽

2021 ◽

Vol 2021 ◽

pp. 1-12

Author(s):

Ting Guo ◽

Huiying Yu

Keyword(s):

Big Data ◽

River Basin ◽

Water Consumption ◽

Water Demand ◽

Environmental Water ◽

Big Data Analysis ◽

Ecological Environment ◽

Sustainable Utilization ◽

Runoff Change ◽

Consumption Change

Starting from the main eco-environmental problems faced by water environment, taking Yanhe River Basin as an example, this paper discusses the theoretical connotation and evaluation calculation method of eco-environmental water consumption. In order to study the eco-environmental water consumption of Yanhe River Basin, a runoff driving factor mining method based on big data analysis is established in this paper. Aiming at the problem that the statistical law and genetic law of runoff change frequently in changing environment, the mining technology method of runoff key driving factors is proposed by combining traditional methods with big data analysis. The characteristic factors that have no significant impact on runoff change are removed, the implicit characteristic factors affecting runoff change are extracted, the driving relationship of hydrological, meteorological, and vegetation characteristic factors on ecological water consumption change is identified, and the key driving factors of ecological water consumption change are extracted, which lays a data foundation for ecological water consumption prediction based on machine learning. The economic water consumption based on eco-environmental water consumption in Yanhe River Basin in the future is predicted (including water demand in three aspects of industry, agriculture, and life); that is, the prediction is to meet the economic water demand on the basis of ensuring that the water consumption of ecological environment will not be occupied, which can effectively ensure the improvement of ecological environment function in Yanhe River Basin and is conducive to the sustainable utilization of water resources in Yanhe River Basin. The research is only based on a small watershed such as Yanhe River Basin, and the purpose of the research is to provide a reference for ecological environment protection and sustainable utilization of water resources in the Loess Plateau, even in the arid, semiarid, and semihumid areas of North China.

Download Full-text