Irrigation Suitability Evaluation of Asu River Basin Soils, South Eastern Nigeria

2007 ◽  
Vol 3 (1) ◽  
pp. 35-41
Author(s):  
A.S. Fasina
Keyword(s):  
River Basin ◽  
Irrigation Suitability ◽  
Suitability Evaluation ◽  
South Eastern

The use of desalinated seawater for crop irrigation in the Segura River Basin (south-eastern Spain)

Desalination ◽  
2017 ◽  
Vol 422 ◽  
pp. 153-164 ◽  
Author(s):  
V. Martínez-Alvarez ◽  
M.J. González-Ortega ◽  
B. Martin-Gorriz ◽  
M. Soto-García ◽  
J.F. Maestre-Valero
Keyword(s):  
River Basin ◽  
South Eastern ◽  
Crop Irrigation

scholarly journals Pottery from the Vak-Kur cemetery of the Yudina Culture (based on materials from excavations 3–6)

2020 ◽  
pp. 83-97
Author(s):  
N.P. Turova
Keyword(s):  
River Basin ◽  
Morphological Features ◽  
Burial Ground ◽  
The South ◽  
Significant Similarity ◽  
Funeral Ritual ◽  
South Eastern ◽  
The Status ◽  
The Right ◽  
Archeological Artifacts

Researchers associate the medieval archeological artifacts of the Middle Trans-Urals, whose pottery bears cord impressions, with the Chiyalik, Molchanvo and Yudina Cultures. Despite the large number of artifacts that have been studied, many questions remain open. These include the status, chronology, and interaction of the Molchanovo and Yudina antiquities, as well as the evolution and specifics of their pottery complexes. Publication and analysis of the ceramic collections from Vak-Kur, the largest burial ground of the Yudina Culture, contribute to addressing some problems related to «the Corded Ware cultures». The Vak-Kur burial ground is dated to the 10th–11th centuries based on the assemblage of the associated goods. It is located in the south-eastern part of the Yudina Culture areal, on the right shore of the Tobol River. For all the time of excavations in the area of the ne-cropolis, 220 burials have been studied. The dead were buried in shallow pits according to the ritual of inhuma-tion, on their backs. A specific feature of the funeral ritual is breaking of a part of the accompanying equipment and use of funerary masks. Decorative and morphological features of 143 Yudina vessels have been examined. The tableware has been categorized according to four topographic groups after excavations 3 to 6. It has been noted that, despite the similar shapes of pots, and ornamental proportions and patterns, the pottery from excava-tions 3 to 6 demonstrates a different frequency in use of such elements in the décor as the cord and figured stamps. The biggest differences were detected between the ceramic artifacts found in excavations 4 and 6. It was suggested that the differences in décor between pottery from different excavations are determined not by their asynchronous nature, but by the existence of several tribal sites in the area of the Yudina necropolis. The com-parison of ceramic collections from the Vak-Kur burial ground with those from the medieval burial and settlement sites of the Yudina Culture showed that the pottery from the necropolis is most closely related to collections from the Plamya Sibiri 6 and 7, and Antonovo 1 settlements located in the Tura River basin. These sites were dated by their investigator to the earlier period (6th to 9th centuries) and attributed to the Molchanovo Culture. Based on the significant similarity between the pottery of the named sites and the dishware of the 10th to 11th centuries from excavation 4 of the Vak-Kur burial ground, a revision of the chronology and cultural attribution of these sites has been proposed.

scholarly journals Reservoir storage and hydrologic responses to droughts in the Paraná River basin, south-eastern Brazil

2016 ◽  
Vol 20 (11) ◽  
pp. 4673-4688 ◽  
Author(s):  
Davi de C. D. Melo ◽  
Bridget R. Scanlon ◽  
Zizhan Zhang ◽  
Edson Wendland ◽  
Lei Yin
Keyword(s):  
Remote Sensing ◽  
Water Supply ◽  
River Basin ◽  
Paraná River ◽  
Monitoring Data ◽  
Reservoir Storage ◽  
Parana River ◽  
South Eastern ◽  
Eastern Brazil ◽  
Paraná River Basin

Abstract. Droughts are particularly critical for Brazil because of impacts on water supply and because most (70 %) of its electricity is derived from hydroelectric generation. The Paraná basin (PB), a major hydroelectric producing region with 32 % (60 million people) of Brazil's population, recently experienced the most severe drought since the 1960s, compromising the water supply for 11 million people in São Paulo. The objective of this study is to quantify linkages between meteorological and hydrological droughts based on remote sensing, modelling, and monitoring data using the Paraná River basin in south-eastern Brazil as a case study. Two major meteorological droughts were identified in the early 2000s and 2014, with precipitation 20–50 % below the long-term mean. Total water storage change estimated from the Gravity Recovery and Climate Experiment (GRACE) satellites declined by 150 km3 between April 2011 and April 2015. Simulated soil moisture storage declined during the droughts, resulting in decreased runoff into reservoirs. As a result, reservoir storage decreased by 30 % relative to the system's maximum capacity, with negative trends ranging from 17 (May 1997–April 2001) to 25 km3 yr−1 (May 2011–April 2015). Storage in upstream reservoirs is mostly controlled by natural climate forcing, whereas storage in downstream reservoirs also reflects dam operations. This study emphasizes the importance of integrating remote sensing, modelling, and monitoring data to evaluate droughts and to establish a preliminary understanding of the linkages between a meteorological and hydrological drought for future management.

Calciphyte steppe communities of the Seim River basin (within the limits of the Kursk Region)

2005 ◽  
pp. 39-49 ◽  
Author(s):  
E. A. Averinova
Keyword(s):  
River Basin ◽  
The South ◽  
Diagnostic Species ◽  
New Associations ◽  
Typical Steppe ◽  
South Eastern ◽  
Steppe Communities ◽  
Steppe Plants ◽  
Bupleurum Falcatum ◽  
Kursk Region

The paper deals with the calciphyte steppe com­munities of the Seim River basin (Kursk Region), represented by the two new associations, Asperulo cynanchicae—Onobrychidietum arenariae ass. nov. and Achilleo collinae—Astragaletum onobrychis ass. nov., which form a new suballiance Bupleuro falcati—Gyp­sophi­lenion altissimae suball. nov. The diagnostic spe­cies of this unit are Anthemis tinctoria, Bupleurum falcatum, Campanula sibirica, Centaurea pseudomacu­­losa, Gypso­phila altissima, Jurinea arachnoidea, Poa compressa, Polygala sibirica, Salvia stepposa, S. ver­­ticillata, Viola rupestris and the ass. Asperulo-Ono­brychidietum is selected as its holotype. The suballiance comprises calciphyte steppe communities on Cre­ta­ceous marl outcrops in both steep and gentle southern and south-eastern gully slopes, characterized by the combination of calciphyte petrophytes and typical steppe plants. According to the diagnostic species set, the unit is referred to the alliance Festucion valesiacae Klika 1931. The studied communities may be treated as a variant of the petrophytic calciphyte steppes distributed in the south-western part of the Middle-Russian Upland.

scholarly journals Hydrochemical Characteristics and Irrigation Suitability Evaluation of Groundwater with Different Degrees of Seawater Intrusion

Water ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 3460
Author(s):  
Zhenyan Wang ◽  
Shu Wang ◽  
Wenyue Liu ◽  
Qiao Su ◽  
Hui Tong ◽  
...  
Keyword(s):  
Adverse Effects ◽  
Seawater Intrusion ◽  
Crop Failure ◽  
Irrigation Suitability ◽  
Suitability Evaluation ◽  
Water Testing ◽  
Groundwater Irrigation ◽  
Hydrochemical Composition ◽  
Water Quality Deterioration ◽  
Composition Changes

Groundwater in coastal aquifers is often affected by seawater intrusion, resulting in water quality deterioration. Using groundwater influenced by seawater intrusion for irrigation can lead to crop failure, erosion of machinery and pipes, and adverse effects on farming. In this study, the results of water testing, methods of statistical analysis, ion ratios, a Piper diagram, and a variety of groundwater irrigation suitability models were used to analyze the chemical composition of groundwater and the influence of seawater intrusion. The result shows that the content of Na+, K+, Ca2+, Mg2+, Cl−, and SO42− in groundwater would increase due to seawater intrusion, and the increasing trend was consistent with the freshwater–seawater mixing line. With the deepening of seawater intrusion, the hydrochemical type gradually changes from Ca-HCO3·Cl to Na·Mg-Cl·SO4 and then to Na-Cl type, and the source of hydrochemical composition changes from “Rock Weathering Dominance” to “Evaporation Dominance”. When the Cl− concentration is greater than 7.1 meq/L, groundwater will corrode pipelines and instruments; when greater than 28.2 meq/L, excessively high salinity of groundwater will have adverse effects on planting; and when greater than 14.1 meq/L, the groundwater hardness is too high, which may make the groundwater unsuitable for cultivation.

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