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| DOI | 10.1016/j.advwatres.2020.103618 |
| The effect of seasonal variation in precipitation and evapotranspiration on the transient travel time distributions | |
| Rahimpour Asenjan M.; Danesh-Yazdi M. | |
| 发表日期 | 2020 |
| ISSN | 0309-1708 |
| 卷号 | 142 |
| 英文摘要 | Precipitation (P), plant water use, and evaporation from the soil surface control the travel time of streamflow (Q) and evapotranspiration (ET) in a complex way. However, the impact of soil moisture and energy availability on the travel time distribution (TTD) of evaporated and transpired waters are yet less understood. In this study, we investigate how the seasonal variability of P and ET in terms of phase shift and rate influences the temporal dynamics of TTDs. To this end, we choose four contrasting climate types described as in-phase P and ET, out-of-phase P and ET, year-round constant P with seasonal ET, and year-round constant ET with seasonal P. We use a physically-based hydrological model to simulate dominant processes in the water and energy cycles as well as subsurface flow velocity, which are subsequently used in a Lagrangian particle-tracking model to characterize the age distribution of water particles in space and time. The results prove that the soil moisture availability than the ET rate imposes a stronger control on the TTD of transpired water in all climate scenarios. Plants indicate an overall tendency towards younger water particles unless in periods with a pronounced dry condition when old waters are more available in the deeper soil layers. In particular, the climate scenario with out-of-phase P and ET yields the highest percentage of old particles taken up by plants. Furthermore, ET age sampling mechanism shows hysteresis against the ET rate, with an opposite direction in climates with in-phase and out-of-phase P and ET. Our results also suggest that the ratio between the median travel time of Q and the median age of water storage has a dual relationship with the Q rate, indicating the existence of a threshold behavior that distinguishes the direct and inverse storage effects based on the storage volume. © 2020 |
| 关键词 | Climate modelsEvapotranspirationFlow velocitySoil moistureWater supplyEnergy availabilityHydrological modelingLagrangian particle-tracking modelSampling mechanismsSeasonal variabilitySeasonal variationSoil moisture availabilityTravel time distributionsTravel timeevapotranspirationflow fieldflow velocityhydrological modelingprecipitation (climatology)seasonal variationstreamflowtravel timewater use |
| 语种 | 英语 |
| 来源机构 | Advances in Water Resources |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/131775 |
| 推荐引用方式 GB/T 7714 | Rahimpour Asenjan M.,Danesh-Yazdi M.. The effect of seasonal variation in precipitation and evapotranspiration on the transient travel time distributions[J]. Advances in Water Resources,2020,142. |
| APA | Rahimpour Asenjan M.,&Danesh-Yazdi M..(2020).The effect of seasonal variation in precipitation and evapotranspiration on the transient travel time distributions.,142. |
| MLA | Rahimpour Asenjan M.,et al."The effect of seasonal variation in precipitation and evapotranspiration on the transient travel time distributions".142(2020). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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