Investigating the controlling factors on salinity in soil, groundwater, and river water in a semi-arid agricultural watershed using SWAT-Salt

2021 ◽  
pp. 152293
Author(s):  
Pardis Hosseini ◽  
Ryan T. Bailey
Keyword(s):  
River Water ◽  
Controlling Factors ◽  
Agricultural Watershed ◽  
Semi Arid

scholarly journals Study on the hydro-chemistry process after mixing between water and rocks

2018 ◽  
Vol 54 (2) ◽  
pp. 104-114
Author(s):  
Xiuyan Jing ◽  
Hongbin Yang ◽  
Na Wang
Keyword(s):  
River Water ◽  
Arid Regions ◽  
Yellow River ◽  
Dilution Effect ◽  
Northwest China ◽  
Experimental Simulation ◽  
The Yellow River ◽  
Mixing Ratio ◽  
Close Attention ◽  
Semi Arid

Abstract The chemical evolution of groundwater has received close attention from hydro-geologists. Northwest China largely consists of arid and semi-arid regions, where surface water and groundwater frequently exchange with each other, and where the mixing and water–rock interactions significantly affect the direction of water quality evolution. Based on experimental simulation, this paper investigates the interactions among the Yellow River water, groundwater and rocks in Yinchuan. The study found that when groundwater is mixed with the Yellow River water, the Yellow River water has a certain dilution effect on the hydro-chemical composition of groundwater; however, this effect is not simply diluted by proportion for no reaction between irons, but a portion of calcium, sulfur, and carbonate form precipitates. After mixing of the Yellow River water, groundwater and rocks, the pH increased, and the carbon dioxide system reached equilibrium again. In addition, CO32− was produced. While Na+ increase was mainly due to dissolution, SO42− decrease was because of precipitation. The precipitation or dissolution of Ca2+, Mg2+, and CO32− mainly depended on the mixing ratio between groundwater and river water, which suggested the reversible behavior of the dissolution-precipitation of carbonate minerals.

scholarly journals Spatial Variation and Controlling Factors of H and O Isotopes in Lancang River Water, Southwest China

2019 ◽  
Vol 16 (24) ◽  
pp. 4932 ◽  
Author(s):  
Kunhua Yang ◽  
Guilin Han ◽  
Jie Zeng ◽  
Bin Liang ◽  
Rui Qu ◽  
...  
Keyword(s):  
Isotopic Composition ◽  
River Water ◽  
Hydrological Cycle ◽  
Water Cycle ◽  
Water Security ◽  
Controlling Factors ◽  
Main Stream ◽  
Wet Season ◽  
Lancang River ◽  
O Isotopes

Climate changes and other human activities have substantially altered the hydrological cycle with respect to elevation. In this study, longitudinal patterns in the stable isotopic composition (δ2H and δ18O) of Lancang River water, originating from the Qinghai–Tibetan Plateau, are presented, and several controlling factors in the wet season are hypothesized. Lancang River water δ2H (−145.2‰ to −60.7‰) and δ18O (−18.51‰ to −8.49‰) were low but close to those of the Global Meteoric Water Line. In the upper reaches of the river, δ2H decreased longitudinally, potentially due to groundwater inputs and melting ground ice in the headwater zone and to an increasing proportion of glacier meltwater with decreasing elevation. In the middle reaches of the river, δ2H values increased slowly moving downstream, likely due to shifts in precipitation inputs, as evidenced by the isotopic composition of tributaries to the main stream. In the lower reaches of the river, the isotopic composition was relatively invariant, potentially related to the presence of large artificial reservoirs that increase the water resident time. The results reveal different hydrological patterns along an alpine river in central Asia associated with both natural and anthropogenic processes. Understanding the degree and type of human interference with the water cycle in this region could improve water management and water security.

Characteristics and controlling factors of bank gullies in two semi-arid mediterranean environments

Geomorphology ◽  
2000 ◽  
Vol 33 (1-2) ◽  
pp. 37-58 ◽  
Author(s):  
L. Vandekerckhove ◽  
J. Poesen ◽  
D. Oostwoud Wijdenes ◽  
G. Gyssels ◽  
L. Beuselinck ◽  
...  
Keyword(s):  
Controlling Factors ◽  
Mediterranean Environments ◽  
Semi Arid

Oxygen-18 dynamics in precipitation and streamflow in a semi-arid agricultural watershed, Eastern Washington, USA

2009 ◽  
pp. n/a-n/a ◽  
Author(s):  
Bryan G. Moravec ◽  
C. Kent Keller ◽  
Jeffrey L. Smith ◽  
Richelle M. Allen-King ◽  
Angela J. Goodwin ◽  
...  
Keyword(s):  
Agricultural Watershed ◽  
Eastern Washington ◽  
Semi Arid

scholarly journals Hydrochemistry of the Lhasa River, Tibetan Plateau: Spatiotemporal Variations of Major Ions Compositions and Controlling Factors Using Multivariate Statistical Approaches

Water ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 3660
Author(s):  
Meizhuang Zhu ◽  
Xingxing Kuang ◽  
Yuqing Feng ◽  
Yinlei Hao ◽  
Qiule He ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
River Water ◽  
Major Ions ◽  
Anthropogenic Activities ◽  
Controlling Factors ◽  
Anthropogenic Activity ◽  
Chemical Compositions ◽  
Spatiotemporal Variations ◽  
Southern Tibetan Plateau ◽  
Lhasa River

Spatiotemporal variations of the hydrochemical major ions compositions and their controlling factors are essential features of a river basin. However, similar studies in the southern Tibetan Plateau are relatively limited. This study focuses on the chemical compositions of the dissolved loads in the Lhasa River (LR) in the southern Tibetan Plateau. Two sampling campaigns were conducted during the rainy and dry seasons across the LR basin to systematically investigate the spatiotemporal variations of water chemistry and sources of the dissolved loads. The results show that the river water possesses slight alkalinity with an average pH of 8.05 ± 0.04. Total dissolved solids (TDS) and oxidation-reduction potential (ORP) range widely from 39.8 mg/L to 582.6 mg/L with an average value of 165.6 ± 7.7 mg/L and from −9.4 mV to 295 mV with a mean value of 153.7 ± 6.9 mV, respectively. The major cations follow the decreasing order of Ca2+, Mg2+, Na+, and K+ while HCO3−, SO42−, Cl−, and NO3− for anions. Ca2+ and Mg2+ account for 87.8% of the total cations, while HCO3− and SO42− accounts for 93.9% of the total anions. All the major ions show higher concentrations in the dry season. NO3−, HCO3−, and Mg2+ show significant spatial variations due to the influence of basin lithology and anthropogenic activity. Multi-variables statistical analysis reveals that the mechanisms controlling the LR hydrochemistry are mainly carbonate weathering followed by silicate weathering. Geothermal springs and anthropogenic activities also play crucial roles in altering river water ions composition in the middle stream and downstream. The relatively high NO3− value (3 ± 0.2 mg/L) suggests water quality will be under the threat of pollution with the increase of anthropogenic activities.

Pesticide contamination drives adaptive genetic variation in the endemic mayfly Andesiops torrens within a semi-arid agricultural watershed of Chile

2019 ◽  
Vol 255 ◽  
pp. 113099
Author(s):  
Nicolas Gouin ◽  
Angéline Bertin ◽  
Mara I. Espinosa ◽  
Daniel D. Snow ◽  
Jonathan M. Ali ◽  
...  
Keyword(s):  
Genetic Variation ◽  
Agricultural Watershed ◽  
Pesticide Contamination ◽  
Adaptive Genetic Variation ◽  
Semi Arid
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