Your search found 11 records
1 Wang, Z.. 1991. The effect of utilization of hyperconcentrated flow and its conveying in Baogixia Weihui Irrigation District. In ICID, The Special Technical Session Proceedings, Beijing, China, April 1991. Vol.1-B: Operation of irrigation systems. New Delhi, India: ICID. pp.172-182.
(Location: IWMI-HQ Call no: ICID 631.7 G000 ICI Record No: H014738)
2 Wang, Z.; Zhen, M.; Wang, Z.. 1994. The use and conveyance of hyperconcentrated turbid flows. ICID Bulletin, 43(2):117-126.
(Location: IWMI-HQ Call no: PER Record No: H016381)
3 Wang, Z.; Reddy, J. M.; Feyen, J. 1995. Improved 0-1 programming model for optimal flow scheduling in irrigation canals. Irrigation and Drainage Systems, 9(2):105-116.
Irrigation canals ; Irrigation scheduling ; Mathematical models ; Flow control ; Flow regulators ; Computer techniques ; Optimization / China
(Location: IWMI-HQ Call no: PER Record No: H017431)
An improved 0-1 programming model was presented for optimal flow regulation and optimal grouping and sequencing of outlets in irrigation distributaries, under restrictions of both the rotational period and the incoming flow rate into distributaries. The problem was solved using a commercially available 0-1 programming software package. The example computations indicated that this model could effectively provide a constant flow rate into the canal during most of the rotation period, and thus reduce the frequency of headgate operation. This formulation also minimized the accidental water wastage by appropriately sizing the canal cross-section.
4 Wang, Z.; Zerihun, D.; Feyen, J. 1996. General irrigation efficiency for field water management. Agricultural Water Management, 30(2):123-132.
(Location: IWMI-HQ Call no: PER Record No: H018562)
5 Zerihun, D.; Wang, Z.; Feyen, J.; Reddy, J. M. 1997. Empirical functions for dependent furrow irrigation variables: 2. Applications. Irrigation Science, 17(3):121-126.
(Location: IWMI-HQ Call no: PER Record No: H020490)
6 Zerihun, D.; Wang, Z.; Rimal, S.; Feyen, J.; Reddy, J. M. 1997. Analysis of surface irrigation performance terms and indices. Agricultural Water Management, 34(1):25-46.
Surface irrigation ; Furrow irrigation ; Basin irrigation ; Irrigation efficiency ; Water loss ; Performance indexes
(Location: IWMI-HQ Call no: PER Record No: H021014)
7 Vollmer, D.; Shaad, K.; Souter, N. J.; Farrell, T.; Dudgeon, D.; Sullivan, C. A.; Fauconnier, I.; MacDonald, G. M.; McCartney, Matthew P.; Power, A. G.; McNally, A.; Andelman, S. J.; Capon, T.; Devineni, N.; Apirumanekul, C.; Nam Ng, C.; Shaw, M. R.; Wang, R. Y.; Lai, C.; Wang, Z.; Regan, H. M. 2018. Integrating the social, hydrological and ecological dimensions of freshwater health: the freshwater health index. Science of the Total Environment, 627:304-313. [doi: https://doi.org/10.1016/j.scitotenv.2018.01.040]
Freshwater ; Water governance ; Stakeholders ; Ecosystem services ; Ecological factors ; Water security ; Water resources ; Water management ; Water demand ; Sustainability ; Environmental health ; Indicators ; River basins / China / Dongjiang River Basin
(Location: IWMI HQ Call no: e-copy only Record No: H048519)
https://ac.els-cdn.com/S0048969718300421/1-s2.0-S0048969718300421-main.pdf?_tid=f9ece1d2-1aa6-11e8-bd92-00000aab0f6c&acdnat=1519616689_e389c8dbeceef2e477e95bff7632ec3f
https://vlibrary.iwmi.org/pdf/H048519.pdf
https://vlibrary.iwmi.org/pdf/H048519.pdf
(1.55 MB)
Degradation of freshwater ecosystems and the services they provide is a primary cause of increasing water insecurity, raising the need for integrated solutions to freshwater management. While methods for characterizing the multi-faceted challenges of managing freshwater ecosystems abound, they tend to emphasize either social or ecological dimensions and fall short of being truly integrative. This paper suggests that management for sustainability of freshwater systems needs to consider the linkages between human water uses, freshwater ecosystems and governance. We present a conceptualization of freshwater resources as part of an integrated social-ecological system and propose a set of corresponding indicators to monitor freshwater ecosystem health and to highlight priorities for management. We demonstrate an application of this new framework —the Freshwater Health Index (FHI) — in the Dongjiang River Basin in southern China, where stakeholders are addressing multiple and conflicting freshwater demands. By combining empirical and modeled datasets with surveys to gauge stakeholders' preferences and elicit expert information about governance mechanisms, the FHI helps stakeholders understand the status of freshwater ecosystems in their basin, how ecosystems are being manipulated to enhance or decrease water-related services, and how well the existing water resource management regime is equipped to govern these dynamics over time. This framework helps to operationalize a truly integrated approach to water resource management by recognizing the interplay between governance, stakeholders, freshwater ecosystems and the services they provide.
8 Meng, Y.; Liu, J.; Wang, Z.; Mao, G.; Wang, K.; Yang, H. 2021. Undermined co-benefits of hydropower and irrigation under climate change. Resources, Conservation and Recycling, 167:105375. (Online first) [doi: https://doi.org/10.1016/j.resconrec.2020.105375]
Hydropower ; Hydroelectric power generation ; Irrigation water ; Water supply ; River basins ; Dam construction ; Climate change ; Global warming ; Water demand ; Energy ; Food security ; Nexus ; Rice ; Models / Cambodia / Thailand / Mekong River Basin
(Location: IWMI HQ Call no: e-copy only Record No: H050238)
https://www.sciencedirect.com/science/article/pii/S092134492030690X/pdfft?md5=f75c9af18cfb3f7dc59ecfefa5c7bee5&pid=1-s2.0-S092134492030690X-main.pdf
https://vlibrary.iwmi.org/pdf/H050238.pdf
https://vlibrary.iwmi.org/pdf/H050238.pdf
(6.67 MB) (6.67 MB)
Dam construction is mostly aimed for multiple functions, including irrigation water provision, hydropower, and some others that bring substantial social benefits. However, global warming impacts on the interaction of the positive outcomes of damming remain little known, particularly in terms of the sustainability of their co-benefits, whereby investigating the different impacts of global warming scenarios of 1.5 °C and 2 °C has been a hotspot in water resources and energy research worldwide. This study used an integrative analysis based on a hydrological, techno-economic and agricultural modeling framework to evaluate the effects of global warming scenarios of 1.5 °C and 2 °C on the co-benefits between hydropower and irrigation in the Mekong River basin. The results show the declined hydropower generation and irrigation water supply in the Mekong River basin under 1.5 °C and 2 °C warming scenarios. The co-benefits between the hydropower and the irrigation is more undermined by the global warming of 2 °C relative to 1.5 °C in the Mekong River basin. Moreover, the changes of co-benefits are sensitive to the consideration of the protected areas in the basin. With the consideration of the protected areas, the co-benefits would be enhanced by 2 °C global warming compared to 1.5 °C global warming. Therefore, it is critical for decision-makers to consider the tradeoffs between the environment and dam construction for ensuring energy and food security under global warming scenarios.
9 Wang, Z.; Liu, J.; Li, J.; Meng, Y.; Pokhrel, Y.; Zhang, H. 2021. Basin-scale high-resolution extraction of drainage networks using 10-m sentinel-2 imagery. Remote Sensing of Environment, 255:112281. [doi: https://doi.org/10.1016/j.rse.2020.112281]
River basins ; Drainage ; Surface water ; Remote sensing ; Satellite imagery ; Landsat ; Topography ; Hydrology ; Waterlogging ; Models ; Sensitivity analysis / South East Asia / Lancang-Mekong River basin
(Location: IWMI HQ Call no: e-copy only Record No: H050243)
https://www.sciencedirect.com/science/article/pii/S0034425720306544/pdfft?md5=2f76248cacbe2d8d068d7a1245264788&pid=1-s2.0-S0034425720306544-main.pdf
https://vlibrary.iwmi.org/pdf/H050243.pdf
https://vlibrary.iwmi.org/pdf/H050243.pdf
(12.90 MB) (12.9 MB)
Extraction of drainage networks is an important element of river flow routing in hydrology and large-scale estimates of river behaviors in Earth sciences. Emerging studies with a focus on greenhouse gases reveal that small rivers can contribute to more than half of the global carbon emissions from inland waters (including lakes and wetlands). However, large-scale extraction of drainage networks is constrained by the coarse resolution of observational data and models, which hinders assessments of terrestrial hydrological and biogeochemical cycles. Recognizing that Sentinel-2 satellite can detect surface water up to a 10-m resolution over large scales, we propose a new method named Remote Sensing Stream Burning (RSSB) to integrate high-resolution observational flow location with coarse topography to improve the extraction of drainage network. In RSSB, satellite-derived input is integrated in a spatially continuous manner, producing a quasi-bathymetry map where relative relief is enforced, enabling a fine-grained, accurate, and multitemporal extraction of drainage network. RSSB was applied to the Lancang-Mekong River basin to derive a 10-m resolution drainage network, with a significant reduction in location errors as validated by the river centerline measurements. The high-resolution extraction resulted in a realistic representation of meanders and detailed network connections. Further, RSSB enabled a multitemporal extraction of river networks during wet/dry seasons and before/after the formation of new channels. The proposed method is fully automated, meaning that the network extraction preserves basin-wide connectivity without requiring any postprocessing, hence facilitating the construction of drainage networks data with openly accessible imagery. The RSSB method provides a basis for the accurate representation of drainage networks that maintains channel connectivity, allows a more realistic inclusion of small rivers and streams, and enables a greater understanding of complex but active exchange between inland water and other related Earth system components.
10 Wang, Z.; Guo, J.; Ling, H.; Han, F.; Kong, Z.; Wang, W. 2022. Function zoning based on spatial and temporal changes in quantity and quality of ecosystem services under enhanced management of water resources in arid basins. Ecological Indicators, 137:108725. [doi: https://doi.org/10.1016/j.ecolind.2022.108725]
Water resources ; Water management ; River basin management ; Arid zones ; Ecosystem services ; Groundwater ; Water depth ; Evapotranspiration ; Indicators ; Ecological factors ; Soil moisture ; Farmland ; Vegetation index / China / Tarim River Basin
(Location: IWMI HQ Call no: e-copy only Record No: H051042)
https://www.sciencedirect.com/science/article/pii/S1470160X22001960/pdfft?md5=e6486faba3832bd2330718ca8ff536a1&pid=1-s2.0-S1470160X22001960-main.pdf
https://vlibrary.iwmi.org/pdf/H051042.pdf
https://vlibrary.iwmi.org/pdf/H051042.pdf
(6.62 MB) (6.62 MB)
With global warming, the contradiction between the supply and demand of water resources is increasingly prominent in arid areas. Enhancing water resource management is an important way to alleviate the shortage of ecological water supply and improve ecosystem services in arid river basins. However, previous studies have rarely conducted comprehensive function zoning of ecosystem services using two aspects: category (quantity) and strength change (quality), based on the changes in ecosystem services. In this regard, two scientific problems need to be solved:(1) quantifying the temporal and spatial changes of ecosystem services and (2) conducting function zoning of ecosystem services in terms of quantity and quality. To answer these two questions, we took the upper and middle reaches of the Tarim River Basin in China as the study area. According to the eco-environmental characteristics of arid basins, this study measured four key indices: carbon storage (CAS), evapotranspiration (ET), temperature vegetation dryness index (TVDI) and groundwater depth (GWD). We used the related model to quantitatively analyze the spatial and temporal distribution of these four indicators and the spatial aggregation characteristics of increases and decreases. We used the Reclassify tool of ArcGIS 10.5 to classify areas with more than two important zones as high-quantity ecosystem services zones. We used factor analysis, combined with Quantile, to divide ecosystem service quality into high-quality and low-quality zones. Considering the quantity and quality of ecosystem services, we divided ecosystem services into important, general, sensitive and fragile ecosystem services zones. Based on comprehensive zoning results during 2000–2018, an ecosystem services restoration zoning was determined. We used correlation analysis to analyze the basic drivers of changes in these four indicators. The results showed that during 2000–2018, CAS and ET in the Tarim River Basin increased by 0.2% and 15.3%, respectively, TVDI decreased by 22.5% and GWD rose by 1.7%. In 2018, the hot spots of CAS, ET, TVDI and GWD accounted for a small proportion of the whole study area, accounting for 3.8%, 5.9%, 9.0% and 1.4%, respectively. Compared with 2000, the high-quantity zone of ecosystem services increased by 10.7% and the high-quality zone of ecosystem services increased by 2.0% in 2018. This clearly showed that water diversion and riverway loss were the main factor driving changes in ecosystem services. In terms of maintaining groundwater depth and increasing vegetation coverage, specific counter measures and suggestions for increasing the number of ecosystem services (“increment”) and improving the quality of ecosystem services (“quality improvement”) were proposed. This study can provide a scientific reference for achieving optimal management of water resource systems for similar river basins in arid regions.
11 He, Q.; Liu, De L.; Wang, B.; Wang, Z.; Cowie, A.; Simmons, A.; Xu, Z.; Li, L.; Shi, Y.; Liu, K.; Harrison, M. T.; Waters, C.; Huete, A.; Yu, Q. 2024. A food-energy-water-carbon nexus framework informs region-specific optimal strategies for agricultural sustainability. Resources, Conservation and Recycling, 203:107428. (Online first) [doi: https://doi.org/10.1016/j.resconrec.2024.107428]
Sustainable agriculture ; Strategies ; Nexus approaches ; Carbon footprint ; Carbon sequestration ; Water use ; Energy ; Food production ; Greenhouse gas emissions ; Profitability ; Cover plants ; Cropping systems ; Crop production ; Cash crops ; Sorghum ; Wheat ; Chickpeas ; Crop rotation ; Crop yield ; Water footprint ; Rainfall / Australia / New South Wales
(Location: IWMI HQ Call no: e-copy only Record No: H052623)
(7.12 MB)
Agricultural sustainability is threatened by pressures from water scarcity, energy crises, escalating greenhouse gas (GHG) emissions, and diminishing farm profitability. Practices that diversify crop rotations, retain crop residues, and incorporate cover crops have been widely studied for their impacts on soil organic carbon and crop production. However, their associated usage of natural resources and economic returns have been overlooked. Here, we employed a food-energy-water-carbon (FEWC) nexus framework to assess the sustainability of crop rotations plus various management strategies across three sub-regions of New South Wales (NSW) in Australia. We found that compared with residue burning and fallowing, residue retention and cover cropping contributed to GHG abatement, but the latter consumed more energy and water per hectare. The composite sustainability scores, calculated with the FEWC framework, suggested that legume-inclusive rotations were generally more sustainable. Furthermore, in northern NSW (with existing sorghum/wheat/chickpea/wheat rotation), residue retention with cover cropping was most suitable combination, while the use of residue retention with fallow yielded greater benefits in southern NSW (with existing wheat/field pea/wheat/canola rotation). Regional disparities in climate, soil, cropping systems, and on-farm costs prompted region-specific strategies to address the unbalanced distribution among FEWC domains. Our study provides assessments for identifying feasible management practices to advance agricultural sustainability.
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