Analysis of channel transmission losses in a dryland river reach in north‐eastern Brazil using streamflow series, groundwater level series and multi‐temporal satellite data
Analysis of channel transmission losses in a dryland river reach in north‐eastern Brazil using streamflow series, groundwater level series and multi‐temporal satellite data
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利用径流系列、地下水位系列和多时相卫星数据分析巴西东北部旱地河段的河道传输损失
DOI：
10.1002/hyp.9243
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发表时间：
2013
影响因子：
3.2
通讯作者：
A. Bronstert
中科院分区：
文献类型：
--
作者：
A. C. Costa;S. Foerster;J. C. Araújo;A. Bronstert
水文数据的缺乏，特别是河川流量和地下水位序列，限制了对旱地渠道传输损失的理解。此外，空间河流动力学信息的缺乏，包含在大型河流TL分析的高度不确定性。本研究的目的是联合收割机的信息，从径流和地下水水位序列与多时相卫星数据，推导出一个水文概念TL的一段中Jaguaribe河（MJR）在半干旱的巴西东北部。在此基础上，提出了其建模与仿真策略。热释光发生在冲积层中，河流和地下水可以被认为是水力连接的。正如卫星图像分析所显示的那样，大多数损失肯定只通过河床和堤坝渗透，而不是通过洪泛平原。输入河流流量小于阈值的TL事件没有到达MJR的出口。输入流量高于此阈值的TL事件到达出口时，平均损失30%的输入。在旱季（DS）和雨季（DS/BRS）开始时，预计事件前没有河流流量，事件垂直渗透到冲积层中。在雨季（MRS/ERS）的中期和末期，由基流维持的河流流量发生在事件之前/之后，并且侧向渗透到冲积层中起着主要作用。因此，MJR从DS/BRS的亏损河流转变为MRS/ERS的亏损/盈利（大部分亏损）河流。该系统的模型必须包括河流和地下水流过程的耦合，并通过渗漏方法联系起来。版权所有© 2012约翰威利父子有限公司.
Scarcity of hydrological data, especially streamflow discharge and groundwater level series, restricts the understanding of channel transmission losses (TL) in drylands. Furthermore, the lack of information on spatial river dynamics encompasses high uncertainty on TL analysis in large rivers. The objective of this study was to combine the information from streamflow and groundwater level series with multi‐temporal satellite data to derive a hydrological concept of TL for a reach of the Middle Jaguaribe River (MJR) in semi‐arid north‐eastern Brazil. Based on this analysis, we proposed strategies for its modelling and simulation. TL take place in an alluvium, where river and groundwater can be considered to be hydraulically connected. Most losses certainly infiltrated only through streambed and levees and not through the flood plains, as could be shown by satellite image analysis. TL events whose input river flows were smaller than a threshold did not reach the outlet of the MJR. TL events whose input flows were higher than this threshold reached the outlet losing on average 30% of their input. During the dry seasons (DS) and at the beginning of rainy seasons (DS/BRS), no river flow is expected for pre‐events, and events have vertical infiltration into the alluvium. At the middle and the end of the rainy seasons (MRS/ERS), river flow sustained by base flow occurs before/after events, and lateral infiltration into the alluvium plays a major role. Thus, the MJR shifts from being a losing river at DS/BRS to become a losing/gaining (mostly losing) river at MRS/ERS. A model of this system has to include the coupling of river and groundwater flow processes linked by a leakage approach. Copyright © 2012 John Wiley & Sons, Ltd.
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