Characterising the hydrological regime of an ungauged temporary river system: a case study
Characterising the hydrological regime of an ungauged temporary river system: a case study
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描述未测量的临时河流系统的水文状况：案例研究
DOI：
10.1007/s11356-016-7169-0
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发表时间：
2017
影响因子：
5.8
通讯作者：
M. Rulli
中科院分区：
文献类型：
--
作者：
E. D’Ambrosio;A. De Girolamo;E. Barca;P. Ielpo;M. Rulli
临时河流的特点是特定的水文制度，影响生态系统过程，地下水和地表水的相互作用，沉积物制度，营养物质的输送，水质和生态状况。本文提出了一种方法来识别和分类的临时河流在意大利南部的水文指标（HI）计算与长期的日常流量记录的基础上的政权。通过主成分分析（PCA），确定了一组非冗余的指标，描述在研究区的水文情势的主要特征。确定的指标是年最大30和90天平均值（DH4和DH5），零流量天数（DL6），流量持久性（MF）和6个月的季节性可预测性干旱期（SD6）。一种方法也进行了测试，以估计选定的HI在ungauged河段。流域特征，如汇水面积，测量站海拔，平均流域坡度，平均年降雨量，土地利用，土壤导水率和有效水含量推导出每个站点。然后，利用回归分析将选定的指标与集水特征联系起来。最后，利用MF和SD6对各河段进行了基于通畅度的分类。本文提出的方法构成了一个有用的工具，生态学家和水资源管理人员在水框架指令的实施过程中，这需要一个表征的水文制度和“河流类型”的所有水体分类。
Temporary streams are characterised by specific hydrological regimes, which influence ecosystem processes, groundwater and surface water interactions, sediment regime, nutrient delivery, water quality and ecological status. This paper presents a methodology to characterise and classify the regime of a temporary river in Southern Italy based on hydrological indicators (HIs) computed with long-term daily flow records. By using a principal component analysis (PCA), a set of non-redundant indices were identified describing the main characteristics of the hydrological regime in the study area. The indicators identified were the annual maximum 30- and 90-day mean (DH4 and DH5), the number of zero flow days (DL6), flow permanence (MF) and the 6-month seasonal predictability of dry periods (SD6). A methodology was also tested to estimate selected HIs in ungauged river reaches. Watershed characteristics such as catchment area, gauging station elevation, mean watershed slope, mean annual rainfall, land use, soil hydraulic conductivity and available water content were derived for each site. Selected indicators were then linked to the catchment characteristics using a regression analysis. Finally, MF and SD6 were used to classify the river reaches on the basis of their degree of intermittency. The methodology presented in this paper constitutes a useful tool for ecologists and water resource managers in the Water Framework Directive implementation process, which requires a characterisation of the hydrological regime and a ‘river type’ classification for all water bodies.