• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Hydrology and Earth System Sciences >Analysis of effective resistance calculation methods and their effect on modelling evapotranspiration in two different patches of vegetation in semi-arid SE Spain
【24h】

Analysis of effective resistance calculation methods and their effect on modelling evapotranspiration in two different patches of vegetation in semi-arid SE Spain

机译：西班牙半干旱地区两种不同植被的有效阻力计算方法及其对蒸发蒸腾建模的影响分析

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Effective parameters are of major importance in modelling surface fluxes atdifferent scales of spatial heterogeneity. Different ways to obtain theseeffective parameters for their use in meso-scale and GCM models have beenstudied. This paper deals with patch-scale heterogeneity, where effectiveresistances were calculated in two patches with different vegetation(Retama sphaerocarpa (L.) Boiss shrubs, and herbaceous plants) using different methods:aggregating soil and plant resistances in parallel, in series or by anaverage of both. Effective aerodynamic resistance was also calculateddirectly from patch fluxes. To assess the validity of the different methodsused, the Penman-Monteith equation was used with effective resistances toestimate the total λE for each patch. The λE estimates found for each patch werecompared to Eddy Covariance system measurements. Results showed that foreffective surface resistances, parallel aggregation of soil and plantresistances led to λE estimates closer to the measured λE in both patches(differences of around 10%). Results for effective aerodynamicresistances differed depending on the patch considered and the method usedto calculate them. The use of effective aerodynamic resistances calculatedfrom fluxes provided less accurate estimates of λE compared to the measuredvalues, than the use of effective aerodynamic resistances aggregated fromsoil and plant resistances. The results reported in this paper show that thebest way of aggregating soil and plant resistances depends on the type ofresistance, and the type of vegetation in the patch.
机译：有效参数在不同空间异质性尺度下的表面通量建模中至关重要。已经研究了获得这些有效参数用于中尺度和GCM模型的不同方法。本文针对斑块规模的异质性进行了研究，其中使用不同的方法在两个具有不同植被（ Retama sphaerocarpa （L.）Boiss灌木和草本植物）的斑块中计算了有效抗性：汇总土壤和植物的抗性并联，串联或平均。有效的空气动力学阻力也直接从补片通量计算得出。为了评估所使用的不同方法的有效性，使用了Penman-Monteith方程和有效电阻来估算每个贴片的总λ E 。将每个补丁的λ E 估计值与涡流协方差系统测量结果进行比较。结果表明，在两个斑块中，有效的表面电阻，土壤的平行聚集和植物抗性导致λ E 估算值更接近实测的λ E （差异约10％）。有效空气动力学阻力的结果取决于所考虑的补丁和用于计算它们的方法而有所不同。与通过测量得出的值相比，使用通量计算出的有效空气动力学阻力提供的λ E 估算值较使用土壤和植物阻力中的有效空气阻力得到的准确估算要差。本文报道的结果表明，整合土壤和植物抗性的最佳方法取决于抗性的类型以及斑块中植被的类型。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号