Mariane Chittolina , Humberto R. da Rocha , Evandro M. Anselmo , Rodolfo M.S. Souza , Leonardo M. Domingues
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引用次数: 0
摘要
研究区域巴西东南部Mantiqueira山脉的四个小水源集水区研究重点我们利用微气象方法(涡动相关系数- ec和Bowen比)、能量平衡闭合修正和流域水收支,结合流量、降水和土壤湿度的测量,研究了小集水区的地表能量平衡制度。1)通过修正,利用EC进行能量平衡闭合得到了显著改善。潜热通量从可用能量的33 %上升到55 %,感热通量从23 %上升到37 %。2)各流域水收支的年平均蒸散发(ET)在2.6 ~ 2.9 mm day-1之间,与修正通量2.8 mm day-1更为接近。3)季节上,ET在年初达到峰值3.5 mm天(⁻¹ ),在7月下降到1.3 mm天(⁻¹ ),这主要是受太阳辐射的影响,而土壤湿度和叶面积指数的滞后最小值可能导致蒸发分数(LE/Rn)在上半年和下半年之间从0.86下降到0.79。4)估算流域年平均蒸发指数(ET/P)在59 % ~ 67 %之间。5)我们的研究结果表明,在复杂地形地区,使用简单的校正方法估算带EC的感热通量和潜热通量是可能的,在能量平衡闭合方面有显著的收获。
Estimation of evapotranspiration using micrometeorological and water budget methods in headwater catchments of southeastern Brazil
Study Region
Four small headwater catchments within the Mantiqueira Range, southeastern Brazil
Study Focus
We investigated the surface energy balance regime in small catchments using micrometeorological methods (eddy covariance-EC and Bowen ratio), energy balance closure corrections, and basin water budgets, incorporating measurements of streamflow, precipitation, and soil moisture.
New hydrological insights for the region
1) Energy balance closure using EC was significantly improved through corrections. Latent heat flux increased from ≃33 % to ≃55 % of the available energy, while sensible heat flux rose from ≃23 % to ≃37 %. 2) Mean annual evapotranspiration (ET) from the water budget across basins ranged from 2.6 to 2.9 mm day–1, aligning more closely with corrected fluxes, of 2.8 mm day–1. 3) Seasonally, ET peaked at 3.5 mm day⁻¹ early in the year and declined to 1.3 mm day⁻¹ in July, primarily driven by solar radiation, while lagged minima in soil moisture and leaf area index likely contributed to the accompanying reduction in evaporative fraction (LE/Rn) from 0.86 to 0.79 between the first and second halves of the year. 4) The mean annual evaporative index (ET/P) across basins was estimated to range from 59 % to 67 %. 5) Our findings show the possibility of using simple correction methods to estimate sensible and latent heat fluxes with EC in complex terrain regions, with significant gains in energy balance closure.
期刊介绍:
Journal of Hydrology: Regional Studies publishes original research papers enhancing the science of hydrology and aiming at region-specific problems, past and future conditions, analysis, review and solutions. The journal particularly welcomes research papers that deliver new insights into region-specific hydrological processes and responses to changing conditions, as well as contributions that incorporate interdisciplinarity and translational science.