Page 74 - 2016地大报告-电子书

2016

A group ofupscaling conversion methods were used to quantify the ET, in which canopy

structure was considered to estimate the transpiration from leaf scale to a unit of field
scale. The groundwater table had a significant response to the irrigation events, thus

the deep percolation was estimated using water-table fluctuation method (WTF). Results
showed that during the two irrigation events of flowering and boiling stages, the total ET was

31.1 mm with the soil surface evaporation of only 0.4 mm. The total percolation of recharge
to groundwater was 48.2 mm which contributed to the groundwater run-off of 22.1 mm.

Transpiration of 30.7 mm accounted for 98.6% of the total ET of 31.1 mm and 34.3% of th
e irrigation water of 90.6 mm. Compared with transpiration, the deep percolation accounted

for 53.2% of irrigation water, indicating a serious excessive irrigation that recharged
to groundwater. Soil salt budget showed that the salt leached into groundwater was

1.56 times of the input from brackish irrigation water and fertilization during the
two irrigation periods. Even for the irrigation practice with brackish water, the accumulated

salt of soil profile could also be leached out under large amount of irrigation water (e.g.
90.6 mm for the two irrigation periods, 10 days). However, the waste of enormous water

which for instance occupied 53.2% of the irrigation water in this study was not conducive
to the sustainable utilization of water resources in the arid oasis. Furthermore, the methods

introduced in this paper for ET and deep percolation calculation of cotton filed could be used
to quantify the oasishydrologic cycle of micro-irrigation, to gain a better understanding of the

ecological process. (C) 2016 Elsevier B.V. All rights reserved.
论文链接：https://doi.org/10.1016/j.jhydrol.2016.04.045

11.Analytical solutions of solute transport in a fracture-matrix system with different
reaction rates for fracture and matrix

作 者 :Zhu, YH ( 朱永惠，博士 ) [ 1 ] ; Zhan, HB ( 詹红兵 ) [ 1,2 ] ;Jin, MG ( 靳孟贵 ) [ 1 ]
JOURNAL OF HYDROLOGY 卷 : 539 页 : 447-456 出版年 : AUG 2016

摘 要 :This study deals with the problem of reactive solute transport in a fracture-
matrix system using both analytical and numerical modeling methods. The

groundwater flow velocity in the fracture is assumed to be high enough (no less
than 0.1 m/day) to ensure the advection-dominant transport in thefracture. The

problem includes advection along the fracture, transverse diffusion in the matrix, w
ith linear sorption as well as first-order reactions operative in both the fracture and

the matrix. A constant concentration boundary condition and a decay source boundary

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