Your search found 5 records
1 Cabangon, R. J.; Castillo, E. G.; Lu, G.; Cui, Y. L.; Tuong, T. P.; Bouman, B. A. M.; Li, Y.; Chen, C.; Wang, J.; Liu, X. 2001. Impact of alternate wetting and drying irrigation on rice growth and resource-use efficiency. Barker, R.; Loeve, R.; Li, Y. H.; Tuong, T. P. (Eds.). Water-saving irrigation for rice: proceedings of an international workshop held in Wuhan, China, 23-25 March 2001. Colombo, Sri Lanka: International Water Management Institute (IWMI) pp.55-79.
Crop-based irrigation ; Rice ; Fertilizers ; Nitrogen ; Rain ; Crop yield ; Percolation ; Seepage ; Paddy fields ; Experiments / China / Hubei / Tuanlin
(Location: IWMI-HQ Call no: IWMI 631.7.2 G592 BAR Record No: H027863)
2 Chen, C.; Roseberg, R. J.; Selker, J. S. 2002. Using microsprinkler irrigation to reduce leaching in a shrink/swell clay soil. Agricultural Water Management, 54(2):159-171.
Sprinkler irrigation ; Small scale systems ; Leaching ; Clay soils ; Precipitation ; Percolation ; Flood irrigation / USA / Oregon
(Location: IWMI-HQ Call no: PER Record No: H029552)
3 Cabangon, R. J.; Tuong, T. P.; Castillo, E. G.; Bao, L. X.; Lu, G.; Wang, G.; Cui, Y.; Bouman, B. A. M.; Li, Y.; Chen, C.; Wang, J. 2004. Effect of irrigation method and N-fertilizer management on rice yield, water productivity and nutrient-use efficiencies in typical lowland rice conditions in China. Paddy and Water Environment, 2:195-206.
Rice ; Paddy fields ; Crop yield ; Irrigated farming ; Experiments ; Water balance ; Productivity ; Fertilizers ; Nitrogen ; Climate / China
(Location: IWMI-HQ Call no: P 7105 Record No: H035933)
4 Durand, M.; Chen, C.; Frasson, R. P. D. M.; Pavelsky, T. M.; Williams, B.; Yang, X.; Fore, A. 2020. How will radar layover impact SWOT [Surface Water and Ocean Topography] measurements of water surface elevation and slope, and estimates of river discharge? Remote Sensing of Environment, 247:111883. (Online first) [doi: https://doi.org/10.1016/j.rse.2020.111883]
Surface water ; Rivers ; Discharges ; Estimation ; Slope ; Digital elevation models ; Uncertainty ; Topography ; Hydrology ; Interferometry ; Radar imagery
(Location: IWMI HQ Call no: e-copy only Record No: H049831)
(6.71 MB)
Water surface elevation (WSE), slope and width measurements from the forthcoming Surface Water and Ocean Topography (SWOT) mission will enable spaceborne estimates of global river discharge. WSE will be measured by interferometric synthetic aperture radar (InSAR). InSAR measurements are vulnerable to contamination from layover, a phenomenon wherein radar returns from multiple locations arrive at the sensor simultaneously, rendering them indistinguishable. This study assesses whether layover will significantly impact the precision of SWOT estimates of global river discharge. We present a theoretical river layover uncertainty model at the scale of nodes and reaches, which constitute nominal 200 m and 10 km averages, respectively, along river centerlines. The model is calibrated using high-resolution simulations of SWOT radar interaction with topography covering a total of 41,233 node observations, across a wide range of near-river topographic features. We find that height uncertainty increases to a maximum value at relatively low values of topographic standard deviation and varies strongly with position in the swath. When applied at global scale, the calibrated model shows that layover causes expected height uncertainty to increase by only a modest amount (from 9.4 to 10.4 cm at the 68th percentile). The 68th percentile of the slope uncertainty increases more significantly, from 10 to 17 mm/km. Nonetheless, the 68th percentile discharge uncertainty increases only marginally. We find that the impact of layover on SWOT river discharge is expected to be small in most environments.
5 Shi, H.; Luo, G.; Zheng, H.; Chen, C.; Hellwich, O.; Bai, J.; Liu, T.; Liu, S.; Xue, J.; Cai, P.; He, H.; Ochege, F. U.; Van de Voorde, T.; de Maeyer, P. 2021. A novel causal structure-based framework for comparing a basin-wide water-energy-food-ecology nexus applied to the data-limited Amu Darya and Syr Darya river basins. Hydrology and Earth System Sciences, 25(2):901-925. [doi: https://doi.org/10.5194/hess-25-901-2021]
Water resources ; Energy ; Food security ; Ecology ; Nexus ; River basins ; Downstream ; Upstream ; Reservoirs ; International waters ; Water use ; Conflicts ; Agricultural production ; Models / Central Asia / Aral Sea Basin / Amu Darya River Basin / Syr Darya River Basin
(Location: IWMI HQ Call no: e-copy only Record No: H050537)
https://hess.copernicus.org/articles/25/901/2021/hess-25-901-2021.pdf
https://vlibrary.iwmi.org/pdf/H050537.pdf
https://vlibrary.iwmi.org/pdf/H050537.pdf
(17.90 MB) (17.9 MB)
The previous comparative studies on watersheds were mostly based on the comparison of dispersive characteristics, which lacked systemicity and causality. We proposed a causal structure-based framework for basin comparison based on the Bayesian network (BN) and focus on the basin-scale water–energy–food–ecology (WEFE) nexus. We applied it to the Syr Darya River basin (SDB) and the Amu Darya River basin (ADB), of which poor water management caused the Aral Sea disaster. The causality of the nexus was effectively compared and universality of this framework was discussed. In terms of changes in the nexus, the sensitive factor for the water supplied to the Aral Sea changed from the agricultural development during the Soviet Union period to the disputes in the WEFE nexus after the disintegration. The water–energy contradiction of the SDB is more severe than that of the ADB, partly due to the higher upstream reservoir interception capacity. It further made management of the winter surplus water downstream of the SDB more controversial. Due to this, the water–food–ecology conflict between downstream countries may escalate and turn into a long-term chronic problem. Reducing water inflow to depressions and improving the planting structure prove beneficial to the Aral Sea ecology, and this effect of the SDB is more significant. The construction of reservoirs on the Panj River of the upstream ADB should be cautious to avoid an intense water–energy conflict such as the SDB's. It is also necessary to promote the water-saving drip irrigation and to strengthen the cooperation.
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