Study on the method to estimate the subsurface flow in alluvial sandbars

冲积沙洲地下流量估算方法研究

基本信息

批准号：
11555133
负责人：
TSUJIMOTO Tetsuro
金额：
$ 4.35万
依托单位：
NAGOYA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11555133/
关键词：
Sand bar Stream-aquifer Formation of soil layer Unsaturated soil 不飽和土壤

项目摘要

The aim of the project is to establish the method to estimate the subsurface flow in riparian sandbars in order to evaluate the spatial distribution of habitat of riparian species in sandbar's material or to evaluate water exchange rate with surface flow to estimate the effect of water purification of sandbars in the future. Objects are, (1) subsurface flow in whole sandbar and local flow around small pools, (2 the water exchange rate and its temporal characteristics between subsurface water and unsaturated zone caused by rainfall or evapotranspiration.The methods have been summarized below :1.Development of a method to estimate subsurface water level, flow structure and water budgetThis method has two parts :1) Observation of subsurface water distribution by installing 50-100 wells2) 2-D numerical simulation of subsurface flowThese enable to estimate the subsurface flow structure, retention time in sandbar and water budget with surface water region.2. Development of a combined method … More to estimate subsurface flow around sandbar poolsThe following methods are developed and examined its efficiency.(1) Measurement of subsurface water level distribution around pools installing pipes(2) 2-D subsurface simulation around pools, which affect as inner boundary condition.(3) surface flow analysis to judge the continuity to main channel, and estimate flow condition in it during floods.3. Development of a combined method to estimate exchange rate between subsurface water and unsaturated zone.This method is useful to evaluate water budget of sandbar subsurface water adding to in/out flow at the surface flow boundary by combination of following method :(1) Experiment measurement of hydraulic characteristics of unsaturated soil(2) Core sampling of unsaturated zone to see layer structure(3) 1-D subsurface simulation to estimate water exchange rate at the boundary between saturated zone and unsaturated one.Applications to river Kizu showed that these methods can supply us overall of sandbar subsurface flow, its budget, water exchanging of pools. Less

该项目的目的是建立估计河岸沙洲中地下流量的方法，以评估河岸物质中河岸物种栖息地的空间分布，或者通过表面流量评估水汇率以估算未来沙洲水纯化的影响。物体是，（1）整个砂巴和小池周围的局部流动的地下流量（2（2水汇率及其在地下水和不饱和区域之间的暂时特征和其临时特征）在下面总结了该方法。对地下流量的2-D数值模拟可以估计地下流量结构，在沙洲中的保留时间和地表水区域的水预算。2。开发了一种组合方法……更多以估计围绕沙洲池周围的地下流动，并检查了其效率。（1）测量安装管道周围的池周围地下水位分布（2）二-D地下在池周围的地下模拟，这会影响内部边界条件。（3）表面流量分析以判断持续的频道到主要的频道，并在其估算的流动条件下，并在其估计的流动条件下进行估算。3。3. 3. 3. 3. 3. 3. 3. 3.3。开发一种结合方法来估计地下水和不饱和区之间的汇率。该方法可通过结合以下方法的组合来评估砂巴巴地下水的水预算，从而在表面流量边界处增加/输出流量：（1）实验测量不饱和土壤中的Hydroulic特征（2）在不饱和区域的核心交换区域的核心速度范围，请参见未饱和区域的核心样本，请参见层结构（3）层结构（3）1 d simplations（3）层结构（3）。对Kiyozu河的申请表明，这些方法可以为我们提供沙洲地下流，其预算，水池的水交换。较少的