Page 44 - 水利学报2021年第52卷第6期

Research on the control measures of pluvial and fluvial urban floods based on
holistic view of watershed system

1 2 1 1 1
CHEN Wenlong ，XU Zongxue ，SONG Lixiang ，ZHANG Dawei ，LIU Pei
（1. Pearl River Hydraulic Research Institute，Guangzhou 510611，China；
2. College of Water Sciences，Beijing Normal University，Beijing 100875，China）

Abstract： Pluvial and fluvial floods were considered independently in traditional flood disaster prevention.
According to the investigation and analysis on flooding occurred in Guangzhou City in May 22， 2020， a
new concept， in which the whole river basin is regarded as an integrated system， is proposed in this
study. The design rainfall patterns from both municipal authorities and water authorities are integrated as
one pattern through the way of“big one include small one，and long one include short one” A simulation
.
model for fluvial and pluvial flooding in urban area is developed by coupling the low impact development
facilities， small-scale municipal drainage system， and large-scale hydraulic drainage system. Take the con⁃
trol measures of pluvial and fluvial urban floods in Guangzhou as an example， the case study shows that
the control engineering layout optimization based on holistic view of watershed system can not only meet
the economic and restrictive principles for highly urbanized areas， but also achieve systematic governance
and reach the overall standards. It effectively avoids the disadvantages of "fluvial flooding caused by pluvial
flooding and vise versa" in the traditional flood divide-management mode， which provides a new approach
for urban flood management in China.
Keywords： holistic view of watershed system； joint control of fluvial and pluvial floods； rain pattern； ur⁃
ban flood simulation

（责任编辑：李福田）

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Review of research progress on water transport mechanism of cracks within concrete

WANG Licheng，MU Linjun，ZOU Kai
（State Key Laboratory of Coastal and Offshore Engineering，Dalian University of Technolog，Dalian 116024，China）

Abstract： Cracking of concrete， which may be induced by mechanical loads or resulted from the exposed
environmental action， not only reduces the ability of concrete to resist water penetration， but also provides
additional pathways for aggressive media to penetrate into concrete. This process will obviously reduce ser⁃
vice life as well as durability insufficiency of reinforced concrete structures. This paper systematically re⁃
views the research progress relating to the influence of cracks on water transport within concrete from exper⁃
imental research and numerical simulation. The previous studies indicated that water transport coefficient of
cracked concrete is proportional to the second or third power of crack width. The increase of crack tortuosi⁃
ty can significantly reduce the speed of water transport，while it has little effect by changing the crack sur⁃
face roughness. Meanwhile， the water content absorbed of concrete can be increased due to the develop⁃
ment of crack density. In addition， the self-healing of cracks exposed to profitable environments can de⁃
crease water transport speed in cracks of concrete. Therefore，to investigate the effect of cracking or cracks
concrete on water transport mechanisms in concrete will provide the theoretical basis for durability design
of reinforced concrete structures. Based on the summary of the existing research results， research expecta⁃
tions as well as future priorities associated with water transport mechanisms of the cracked concrete are ar⁃
gued and suggested in the final section of the paper.
Keywords：concrete；water transport；cracks；durability；research progress

（责任编辑：王冰伟）

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