Exploring changes in the spatial distribution of stream baseflow generation during a seasonal recession
Exploring changes in the spatial distribution of stream baseflow generation during a seasonal recession
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探索季节性衰退期间河流基流生成的空间分布变化
DOI：
10.1029/2011wr011552
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发表时间：
2012
影响因子：
5.4
通讯作者：
S. Wondzell
中科院分区：
文献类型：
--
作者：
R. Payn;M. Gooseff;B. McGlynn;K. Bencala;S. Wondzell
流域结构与径流生成的关系是水文学的主要焦点。然而，河流流量的纵向变异性与相邻的山谷结构的比较已经很少，导致水文机制的分布，导致变异性沿沿着山谷径流发电的认识不足。本研究探讨了详细的调查流基流跨越一个计量，23平方公里的山区流域。研究目标是（1）将基流的空间变异性与流域结构的基本要素（主要是地形影响区）联系起来，（2）评估季节性基流衰退期间这些关系的空间格局的时间变化。我们分析了基流的时空变异性，使用（1）夏季水文在研究流域出口和5个子流域出口和（2）纵向系列的流量测量每隔100米沿着的3个最大的子流域（1200至2600米的山谷长度），重复2至3次基流衰退。在300至1200米长的山谷段内的河段往往表现出类似的径流发电特性。这些段之间的过渡位置是一致的整个衰退，往往是搭配在山谷斜坡或山坡河岸特征的突然纵向过渡。无论是内部和子流域之间，径流和地形贡献面积的空间分布之间的相关性下降，在衰退期间，这表明地形对河流基流贡献的影响普遍减少。由于地形对基流的控制明显减少，地下结构的多个方面可能受到影响。
Relating watershed structure to streamflow generation is a primary focus of hydrology. However, comparisons of longitudinal variability in stream discharge with adjacent valley structure have been rare, resulting in poor understanding of the distribution of the hydrologic mechanisms that cause variability in streamflow generation along valleys. This study explores detailed surveys of stream base flow across a gauged, 23 km2 mountain watershed. Research objectives were (1) to relate spatial variability in base flow to fundamental elements of watershed structure, primarily topographic contributing area, and (2) to assess temporal changes in the spatial patterns of those relationships during a seasonal base flow recession. We analyzed spatiotemporal variability in base flow using (1) summer hydrographs at the study watershed outlet and 5 subwatershed outlets and (2) longitudinal series of discharge measurements every ∼100 m along the streams of the 3 largest subwatersheds (1200 to 2600 m in valley length), repeated 2 to 3 times during base flow recession. Reaches within valley segments of 300 to 1200 m in length tended to demonstrate similar streamflow generation characteristics. Locations of transitions between these segments were consistent throughout the recession, and tended to be collocated with abrupt longitudinal transitions in valley slope or hillslope‐riparian characteristics. Both within and among subwatersheds, correlation between the spatial distributions of streamflow and topographic contributing area decreased during the recession, suggesting a general decrease in the influence of topography on stream base flow contributions. As topographic controls on base flow evidently decreased, multiple aspects of subsurface structure were likely to have gained influence.
影响因子：
5.4
作者：
S. Kollet;R. Maxwell;C. Woodward;Steve S. Smith;J. Vanderborght;H. Vereecken;C. Simmer
通讯作者：
S. Kollet;R. Maxwell;C. Woodward;Steve S. Smith;J. Vanderborght;H. Vereecken;C. Simmer