气候变化领域集成服务门户(CCPortal): Assessing the impact of seasonal-rainfall anomalies on catchment-scale water balance components

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DOI	10.5194/hess-24-3211-2020
	Assessing the impact of seasonal-rainfall anomalies on catchment-scale water balance components
	Nasta P.; Allocca C.; Deidda R.; Romano N.; Romano N.
发表日期	2020
ISSN	1027-5606
起始页码	3211
结束页码	3227
卷号	24 期号:6
英文摘要	Although water balance components at the catchment scale are strongly related to annual rainfall, the availability of water resources in Mediterranean catchments also depends on rainfall seasonality. Observed seasonal anomalies in historical records are fairly episodic, but an increase in their frequency might exacerbate water deficit or water excess if the rainy season shortens or extends its duration, e.g., due to climate change. This study evaluates the sensitivity of water yield, evapotranspiration, and groundwater recharge to changes in rainfall seasonality by using the Soil Water Assessment Tool (SWAT) model applied to the upper Alento River catchment (UARC) in southern Italy, where a long time series of daily rainfall is available from 1920 to 2018. We compare two distinct approaches: (i) a "static"approach, where three seasonal features (namely rainy, dry, and transition fixed-duration 4-month seasons) are identified through the standardized precipitation index (SPI) and (ii) a "dynamic"approach based on a stochastic framework, where the duration of two seasons (rainy and dry seasons) varies from year to year according to a probability distribution. Seasonal anomalies occur when the transition season is replaced by the rainy or dry season in the first approach and when season duration occurs in the tails of its normal distribution in the second approach. Results are presented within a probabilistic framework. We also show that the Budyko curve is sensitive to the rainfall seasonality regime in UARC by questioning the implicit assumption of a temporal steady state between annual average dryness and the evaporative index. Although the duration of the rainy season does not exert a major control on water balance, we were able to identify season-dependent regression equations linking water yield to the dryness index in the rainy season. © 2020 Author(s).
语种	英语
scopus关键词	Catchments; Climate change; Drought; Evapotranspiration; Normal distribution; Rain; Runoff; Soil moisture; Stochastic systems; Ground water recharge; Mediterranean catchment; Probabilistic framework; Regression equation; Soil water assessment tool; Standardized precipitation index; Stochastic framework; Water balance components; Recharging (underground waters); anomaly; catchment; climate change; hydrological regime; precipitation assessment; rainfall; water budget; wet season
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159369
作者单位	Nasta, P., Department of Agricultural Sciences, AFBE Division, University of Naples Federico II, Portici (Naples), Italy; Allocca, C., Department of Agricultural Sciences, AFBE Division, University of Naples Federico II, Portici (Naples), Italy; Deidda, R., Department of Civil and Environmental Engineering and Architecture, University of Cagliari, Cagliari, Italy; Romano, N., Department of Agricultural Sciences, AFBE Division, University of Naples Federico II, Portici (Naples), Italy; Romano, N., Interdepartmental Research Center for Environmental Research (C.I.R.AM.), University of Naples Federico II, Naples, Italy
推荐引用方式 GB/T 7714	Nasta P.,Allocca C.,Deidda R.,et al. Assessing the impact of seasonal-rainfall anomalies on catchment-scale water balance components[J],2020,24(6).
APA	Nasta P.,Allocca C.,Deidda R.,Romano N.,&Romano N..(2020).Assessing the impact of seasonal-rainfall anomalies on catchment-scale water balance components.Hydrology and Earth System Sciences,24(6).
MLA	Nasta P.,et al."Assessing the impact of seasonal-rainfall anomalies on catchment-scale water balance components".Hydrology and Earth System Sciences 24.6(2020).