Additional surface-water deficit to meet global universal water accessibility by 2030

2021 ◽  
pp. 128829
Author(s):  
Yan Bo ◽  
Feng Zhou ◽  
Jianshi Zhao ◽  
Junguo Liu ◽  
Jiahong Liu ◽  
...  
Keyword(s):  
Surface Water ◽  
Water Deficit ◽  
Water Accessibility

Surface water deficiency zoning of China based on surface water deficit index (SWDI)

2014 ◽  
Vol 41 (4) ◽  
pp. 372-378 ◽  
Author(s):  
Yaohuan Huang ◽  
Jianhua Wang ◽  
Dong Jiang ◽  
Kang Zhou ◽  
Xiangyi Ding ◽  
...  
Keyword(s):  
Surface Water ◽  
Water Deficit ◽  
Water Deficiency

scholarly journals Comparison of Three Operative Models for Estimating the Surface Water Deficit Using ASTER Reflective and Thermal Data

Sensors ◽  
2007 ◽  
Vol 7 (6) ◽  
pp. 860-883 ◽  
Author(s):  
Mónica García ◽  
Luis Villagarcía ◽  
Sergio Contreras ◽  
Francisco Domingo ◽  
Juan Puigdefábregas
Keyword(s):  
Surface Water ◽  
Water Deficit ◽  
Thermal Data

Rainfall-Runoff Estimation Using SCS-CN and GIS Approach in the Kuakhai Watershed of the Mahanadi Basin of Bhubaneswar Odisha

2018 ◽  
Vol 6 (12) ◽  
pp. 9 ◽  
Author(s):  
Mamata Singh ◽  
D.P Satapathy
Keyword(s):  
Surface Water ◽  
Water Resources ◽  
Ground Water ◽  
Artificial Recharge ◽  
Source Water ◽  
Rainfall Runoff ◽  
Planning And Design ◽  
Water Accessibility ◽  
Scs Cn ◽  
Recharge Structures

Rainfall and runoff are significant constitute the source of water for recharge of ground water in the watershed. Rainfall is a major the primary source of recharge into the ground water. Other, substantial sources of recharge include seepage from tank, canals, streams and functional irrigation. Evaluation of water availability by understanding of rainfall and runoff is essential. Hydrometerological and hydrological data are an important role in the assessment of source water accessibility for planning and design of source water accessibility for planning and design of artificial recharge structures. The surface water resources are available in the watershed from runoff from rivers, streams and in surface water bodies. The total area of study is about 453.5km2, of which fall in kuakhai river basin so considered for runoff model assessment in a watershed is a precondition for the design of artificial recharge structures, reservoir and soil erosion control. Surface water resource planning and management is an important and critical issue in the hard rock regions. Runoff in a watershed affected by geomorphological factors, particularly, land use change affects the runoff volume and runoff rate significantly. In the present case study assumed to estimate the surface runoff from a catchment but one of the Curve Number methods is mostly used. The SCS-CN method is useful for calculation volume of runoff from the land surface meets in the river or streams. The proposed construction of artificial recharge structures can be thought of in the given study area. The output is useful for the watershed development and planning of water resources effectively. Rainfall and runoff are important components contributing significantly to the hydrological cycle, design of hydrological structures and morphology of the drainage system. Estimation of the same is carried out to determine and forecast its effects. Estimation of direct rainfall-runoff is always efficient but is not possible for most of the location in desired time. Use of remote sensing and GIS technology can be useful to overcome the problem in conventional methods for estimating runoff. In this paper, modified Soil Conservation System (SCS) CN method is used for runoff estimation that considers parameter like slope, vegetation cover, area of watershed.

scholarly journals Reconstructed natural runoff suggests imbalance in water scarcity between upstream and downstream regions of China's river basins

2018 ◽  
Author(s):  
Xinyao Zhou ◽  
Yonghui Yang ◽  
Zhuping Sheng
Keyword(s):  
Water Management ◽  
Surface Water ◽  
Water Scarcity ◽  
North China ◽  
Management Strategies ◽  
Water Shortage ◽  
Water Withdrawal ◽  
Management Policy ◽  
Water Accessibility

Abstract. The increasing conflicts for water resources appeal for chronological insight into the imbalance water scarcity between upstream and downstream regions. While the changes of water scarcity in whole basins have been widely analysed, the divergent development of water scarcity between upstream and downstream regions received little concern. Here non-anthropologically intervened runoff (natural runoff) was first reconstructed in China's 67 basins for the period 1961–2010 using the Fu–Budyko framework and then systematically evaluated in comparison with the observed data. Divergent changes in water scarcity, including water stress and water shortage, between upstream and downstream regions were analyzed for the period of 1980s–2000s. The results showed that surface water withdrawal rapidly increased from 140.8 billion m3 (9 % of natural runoff) in 1980s to 189.7 billion m3 (14 %) in 2000s, with 73 % increase occurring in North China (North of the Yangtze River). This led to severe water scarcity of approximately 0.4 billion people (29 % of population) in 2000s in comparison with only ~ 0.2 billion people (17 %) in the 1980s, with all increase of water scarcity-threaten population in North China. Since 1990s, the increase of upstream water withdrawal came along with the decrease of downstream surface water availability in most northern basins, leading to slower increase in upstream water scarcity and faster increase in downstream water scarcity. Even though restrict water management policy restrained upstream surface water withdrawal in some northern basins over latest decade, the effect of such a reduction in upstream surface water withdrawal was too little to stop the continued decline in downstream surface water accessibility. Meanwhile, semi-arid/humid basins are following in the footsteps of arid basins by rapidly increasing upstream surface water withdrawal. The Chinese case study provides an all-round observation of the imbalance upstream–downstream development in water scarcity, as well as the experiences and lessons from different water management strategies.

scholarly journals Simulation-Optimization Model for Conjunctive Management of Surface Water and Groundwater for Agricultural Use

Water ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 3444
Author(s):  
Agbortoko Bate Ashu ◽  
Sang-Il Lee
Keyword(s):  
Surface Water ◽  
Water Resources ◽  
Water Deficit ◽  
Water Resource ◽  
Water Demand ◽  
Simulation Optimization ◽  
Groundwater Resources ◽  
Ann Model ◽  
Agricultural Water ◽  
Conjunctive Management

The conjunctive management of surface water and groundwater resources is essential to sustainably manage water resources. The target study is the Osan watershed, in which approximately 60–70% of rainfall occurs during the summer monsoon in Central South Korea. Surface water resources are overexploited six times as much as groundwater resources in this region, leading to increasing pressure to satisfy the region’s growing agricultural water demand. Therefore, a simulation-optimization (S-O) model at the sub-basin scale is required to optimize water resource allocation in the Osan watershed. An S-O model based on an artificial neural network (ANN) model coupled with Jaya algorithm optimization (JA) was used to determine the yearly conjunctive supply of agricultural water. The objective was to minimize the water deficit in the watershed subject to constraints on the cumulative drawdown in each subarea. The ANN model could predict the behaviour of the groundwater level and facilitate decision making. The S-O model could minimize the water deficit by approximately 80% in response to the gross water demand, thereby proving to be suitable for a conjunctive management model for water resource management and planning.

scholarly journals A Land Surface Water Deficit Model for an Arid and Semiarid Region: Impact of Desertification on the Water Deficit Status in the Loess Plateau, China

1999 ◽  
Vol 12 (1) ◽  
pp. 244-257 ◽  
Author(s):  
Qinxue Wang ◽  
Hidenori Takahashi
Keyword(s):  
Surface Water ◽  
Water Deficit ◽  
Loess Plateau ◽  
Land Surface ◽  
Large Scale ◽  
Semiarid Region ◽  
The Loess Plateau ◽  
Deficit Model ◽  
Land Surface Water ◽  
Arid And Semiarid

Abstract A land surface water deficit model was developed for a large-scale heterogeneous arid and semiarid area with various soil, vegetation, and land use types, and used to simulate seasonal and spatial variability in potential (E0) and actual (Ea) evapotranspiration and an index of water deficit (WDI). Comparisons with the results of other commonly used models and natural vegetation conditions suggest that this model can give an estimate of the success for large-scale regional studies. By using the model, the authors estimated E0, Ea, and WDI in a grid cell of 0.25° lat × 0.25° long over the Loess Plateau, China. Finally, the sensitivities of the model to both a vegetation parameter and an assumed desertification case were simulated, and several highly sensitive areas were found to be the risk regions to desertification.

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