scholarly journals Global bilateral migration projections accounting for diasporas, transit and return flows, and poverty constraints

2021 ◽  
Vol 45 ◽  
pp. 87-140
Author(s):  
Albano Rikani ◽  
Jacob Schewe
Keyword(s):  
Return Flows

scholarly journals Modelling the Impact on Root Water Uptake and Solute Return Flow of Different Drip Irrigation Regimes with Brackish Water

Water ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 425 ◽  
Author(s):  
Fairouz Slama ◽  
Nessrine Zemni ◽  
Fethi Bouksila ◽  
Roberto De Mascellis ◽  
Rachida Bouhlila
Keyword(s):  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Water Uptake ◽  
Brackish Water ◽  
Deficit Irrigation ◽  
Root Zone ◽  
Root Water Uptake ◽  
Return Flows ◽  
Semi Arid

Water scarcity and quality degradation represent real threats to economic, social, and environmental development of arid and semi-arid regions. Drip irrigation associated to Deficit Irrigation (DI) has been investigated as a water saving technique. Yet its environmental impacts on soil and groundwater need to be gone into in depth especially when using brackish irrigation water. Soil water content and salinity were monitored in a fully drip irrigated potato plot with brackish water (4.45 dSm−1) in semi-arid Tunisia. The HYDRUS-1D model was used to investigate the effects of different irrigation regimes (deficit irrigation (T1R, 70% ETc), full irrigation (T2R, 100% ETc), and farmer’s schedule (T3R, 237% ETc) on root water uptake, root zone salinity, and solute return flows to groundwater. The simulated values of soil water content (θ) and electrical conductivity of soil solution (ECsw) were in good agreement with the observation values, as indicated by mean RMSE values (≤0.008 m3·m−3, and ≤0.28 dSm−1 for soil water content and ECsw respectively). The results of the different simulation treatments showed that relative yield accounted for 54%, 70%, and 85.5% of the potential maximal value when both water and solute stress were considered for deficit, full. and farmer’s irrigation, respectively. Root zone salinity was the lowest and root water uptake was the same with and without solute stress for the treatment corresponding to the farmer’s irrigation schedule (273% ETc). Solute return flows reaching the groundwater were the highest for T3R after two subsequent rainfall seasons. Beyond the water efficiency of DI with brackish water, long term studies need to focus on its impact on soil and groundwater salinization risks under changing climate conditions.

Reuse of return flows and its scale effect in irrigation systems based on modified SWAT model

2019 ◽  
Vol 213 ◽  
pp. 280-288 ◽  
Author(s):  
Di Wu ◽  
Yuanlai Cui ◽  
Yitong Wang ◽  
Manyu Chen ◽  
Yufeng Luo ◽  
...  
Keyword(s):  
Scale Effect ◽  
Swat Model ◽  
Irrigation Systems ◽  
Return Flows

Estimating groundwater-river connectivity factor for quantifying changes in irrigation return flows in the Murray–Darling Basin

2020 ◽  
Vol 24 (2) ◽  
pp. 121-138
Author(s):  
Glen Walker ◽  
Quan J. Wang ◽  
Avril C. Horne ◽  
Rick Evans ◽  
Stuart Richardson
Keyword(s):  
Murray Darling Basin ◽  
Return Flows ◽  
Irrigation Return Flows

Estimating the Effects of Return Flows

1967 ◽  
Vol 59 (7) ◽  
pp. 805-819
Author(s):  
Dan M. Wells ◽  
Earnest F. Gloyna
Keyword(s):  
Return Flows

Time‐dependent Circulation Flows: Iron Enrichment in Cooling Flows with Heated Return Flows

2004 ◽  
Vol 615 (2) ◽  
pp. 662-674 ◽  
Author(s):  
William G. Mathews ◽  
Fabrizio Brighenti ◽  
David A. Buote
Keyword(s):  
Time Dependent ◽  
Cooling Flows ◽  
Iron Enrichment ◽  
Return Flows

Open water metabolism and dissolved organic carbon in response to environmental watering in a lowland river–floodplain complex

2016 ◽  
Vol 67 (9) ◽  
pp. 1346 ◽  
Author(s):  
Todd A. Wallace ◽  
Deborah Furst
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Food Webs ◽  
Ecosystem Respiration ◽  
Open Water ◽  
Relative Role ◽  
Eastern Australia ◽  
Return Flows ◽  
Receiving Waters ◽  
The Impact

The relative importance of autochthonous and allochthonous organic material in fuelling ecosystem metabolism is increasingly understood for some river systems. However, in south-eastern Australia, the majority of studies have been conducted during low flows when the supply of allochthonous carbon was limited. Consequently, the importance of episodic inputs of terrestrially derived material in supporting these food webs remains poorly understood. We assessed the influence of return flows from two different scales of environmental watering actions on dissolved organic carbon and open-water productivity in receiving waters adjacent to the watered area. For the wetland-scale event, gross primary productivity and ecosystem respiration increased in the receiving waters during the period of return flows. During the floodplain-scale watering, differences were observed among sites. Within the managed inundation zone, values for net ecosystem productivity switched from near zero during the baseline to strongly negative during the impact period, whereas values at the river sites were either near zero or positive. The results contribute to our understanding of the relative role of allochthonous material in supporting aquatic food webs in lowland rivers, and demonstrate potential for watering actions to have a positive influence on riverine productivity during periods of low water availability.

Sediment and Nutrient Reduction in Irrigation Return Flows by Vegetated Filter Strips on Surface Irrigated Fields

2012 ◽  
Author(s):  
Brian William Bodah ◽  
Jeffrey L Ullman ◽  
Rafael Muñoz-Carpena ◽  
Gregory A Kiker ◽  
Oscar Perez-Ovilla ◽  
...  
Keyword(s):  
Nutrient Reduction ◽  
Filter Strips ◽  
Vegetated Filter Strips ◽  
Return Flows ◽  
Irrigation Return Flows
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