SUBSURFACE FLOW IN A STREAM WITH ALTERNATE SANDBARS
SUBSURFACE FLOW IN A STREAM WITH ALTERNATE SANDBARS
复制标题
具有交替沙洲的河流中的地下流动
DOI：
10.2208/prohe.45.349
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
T. Tsujimoto
中科院分区：
文献类型：
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作者：
A. Ahmed;T. Sumi;T. Tsujimoto
明渠与交替沙坝之间的水流交换对河流生态系统、水平衡和水质问题的研究具有重要意义。通过实验和数值研究得到了地表和地下流动在纵向和横向上的关系。在稳定低流量条件下，地表水流条件对交替沙坝地下水流结构的影响较强，表现为：(1)以纵向水流为主，但地下水高程的纵向分布取决于地表水流条件；(2)地下水流横向梯度随地表水流量和河床形状的不同而不同。确定了三种类型的地下流动模式来定义溪流与沙洲之间的流动交换。利用二维理论进行的数值模拟与实验结果和现场数据吻合较好。
The flow exchange between open channel and alternate sandbar is important for instream ecosystems, water balance and water quality problems investigations. Both experimental and numerical investigations are done to get relationships between surface and subsurface flowin longitudinal and transverse direction. Under steady low flow condition, strong effects of surfaceflow conditions on subsurface flow structures in the alternate sandbars are recognized through experiments as:(1) Longitudinal flow is dominant, but the longitudinal distribution of subsurface water elevations depend on surface flow conditions.(2) Transverse gradient of subsurface flow varies by surface water discharge and bed shape. Three types of subsurface flow patterns are recognized to define flowexchange between stream and sandbar. Numerical simulations using 2-D theory shows good fit with the experimental results and field data.