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Urban flood inundation and damage assessment based on numerical simulations of design rainstorms with different characteristics

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Science China(Technological Sciences) 2020年第11期63卷 2292-2304页

作者： MEI Chao LIU JiaHong WANG Hao LI ZeJin YANG ZhiYong SHAO WeiWei DING XiangYi WENG BaiSha YU YingDong YAN DianYi State Key Laboratory of Simulation and Regulation of water Cycle in River Basin China Institute of Water Resources and Hydropower ResearchBeijing 100038China Engineering and Technology Research center for water resources and Hydroecology of the Ministry of water resources Beijing 100044China

In the context of global climate change and urbanization,urban flooding is an important type of natural disaster that affects urban development,especially in China,which is experiencing rapid *** the past 10 years,urban flooding events have caused huge disaster losses in Chinese *** has resulted in significant negative effects on the urban infrastructure,socioeconomic systems,and urban residents,thus causing widespread *** have confirmed the change in extreme rainstorms is due to the changing environments in many cities *** studies on the impact of these rainstorms with different characteristics for urban flooding is valuable for coping with unfavorable *** addition,numerical simulations provide an economical and viable means to perform these *** paper presents a numerical model of Xiamen Island in *** were conducted for 12 design rainstorm events with different return periods,rain patterns,and *** results indicate that,in the case of an equal rainfall amount,the rainfall intensity is the key factor that affects the inundated area,depth,and ***,the rainfall intensity is not the only determining factor;the rainfall pattern also affects the *** regard to the rainfall pattern,a higher rainfall peak coefficient usually leads to severe urban inundation and *** a result,the lag time would be shorter,which may further exacerbate the impact of urban flood *** results of this study provide insights into managing flood risks,developing urban flood prevention strategies,and designing flood prevention measures.

关键词： urban flood flood damage assessment flood disaster management numerical simulations design rainstorms

Dualistic water cycle pattern and its evolution in Haihe River basin

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Chinese Science Bulletin 2010年第16期55卷 1688-1697页

作者： LIU JiaHong QIN DaYong WANG Hao WANG MingNa YANG ZhiYong China Institute of water resources and Hydropower Research Beijing 100038 China Research center for water resources and Ecology of the Ministry of water resources Beijing 100044 China

The Haihe River basin is widely recognized as an area in China which is most severely affected by human *** water resources utilization and recycling in the basin is very complex, and the characteristic of the dualistic water cycle is becoming more and more *** ever-growing demand of water for modern industry and domestic life nearly dries up all the natu-ral ***, industrial, agricultural and domestic wastewater discharges cause severe deterioration in water ***, many of water courses are either dried out or being heavily *** water resources management can no longer rely on the "monitoring-rehabilitation" model which was originally developed based on the natural water *** paper analyzes the critical characteristics, water balance, and evolution of water flux process based on the theory of dualistic water *** to the water cycle in the Haihe River basin, a schematic diagram was drawn to describe the dualistic water cycle *** different parameters affecting mainly the evolution of water flux in the "dualistic water cycle" are closely examined using the newly-collected *** a result, this paper proposes several water management and control strategies to achieve healthy wa-ter status for the Haihe River basin.

关键词：水资源利用海河流域循环模式二元演化家庭生活现代工业水资源管理

Theories and calculation methods for regional objective ET

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Chinese Science Bulletin 2009年第1期54卷 150-157页

作者： QIN DaYong LU JinYan LIU JiaHong WANG MingNa China Institute of water resources and Hydropower Research Beijing 100044 China Research center on water resources and Ecology of the Ministry of water resources Beijing 100044 China

The regional objective ET (Evapotranspiration) is a new concept in water resources research,which refers to the total amount of water that could be exhausted from a region in the form of vapor per year. The objective-ET based water resources management allocates water to different regions in terms of ET. It controls the water exhausted from a region to meet the objective ET. The regional objective ET must be adapted to fit the region’s local available water resources. By improving the water utilization effi-ciency and reducing the unrecoverable water in the social water circle,it is saved so that water related production is maintained or even increased under the same water consumption conditions. Regional water balance is realized by rationally deploying the available water among different industries,adjusting industrial structures,and adopting new water-saving technologies,therefore to meeting the requirements for groundwater conservation,agricultural income stability,and avoiding environmental damages. Furthermore,water competition among various departments and industries (including envi-ronmental and ecological water use) may be avoided. This paper proposes an innovative definition of objective ET,and its principles,sub-index systems. Besides,a computational method for regional ob-jective ET is developed by combining the distributed hydrological model and the soil moisture model.

关键词：蒸发作用水资源管理分布式水文学模型土壤潮湿模型

Snowmelt runoff prediction under changing climate in the Himalayan cryosphere: A case of Gilgit River Basin

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Geoscience Frontiers 2017年第5期8卷 941-949页

作者： Muhammad Adnan Ghulam Nabi Muhammad Saleem Poomee Arshad Ashraf Climate Change Alternate Energy and Water Resources Institute (CAEWRI) National Agricultural Research Center Park Road Chakshahzad Islamabad Pakistan center of Excellence in water resources (CEWR) Lahore Pakistan

There are serious concerns of rise in temperatures over snowy and glacierized Himalayan region that may eventually affect future river flows of Indus river system. It is therefore necessary to predict snow and glacier melt runoff to manage future water resource of Upper Indus Basin(UIB). The snowmelt runoff model(SRM) coupled with MODIS remote sensing data was employed in this study to predict daily discharges of Gilgit River in the Karakoram Range. The SRM was calibrated successfully and then simulation was made over four years i.e. 2007, 2008, 2009 and 2010 achieving coefficient of model efficiency of 0.96, 0.86, 0.9 and 0.94 respectively. The scenarios of precipitation and mean temperature developed from regional climate model PRECIS were used in SRM model to predict future flows of Gilgit River. The increase of 3 C in mean annual temperature by the end of 21 th century may result in increase of 35-40% in Gilgit River flows. The expected increase in the surface runoff from the snow and glacier melt demands better water conservation and management for irrigation and hydel-power generation in the Indus basin in future.

关键词： Snowmelt runoff model Climate change Gilgit River Himalayan region

Outlier Detection for water Supply Data Based on Joint Auto-Encoder

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Computers, Materials & Continua 2020年第7期64卷 541-555页

作者： Shu Fang Lei Huang Yi Wan Weize Sun Jingxin Xu Guangdong Laboratory of Artificial-Intelligence and Cyber-Economics(SZ) College of Electronics and Information EngineeringShenzhen UniversityShenzhen518061China water resources management center of Ministry of water resources BeijingChina Departmet of Housing and Public Works QueenslandAustralia

With the development of science and technology,the status of the water environment has received more and more *** this paper,we propose a deep learning model,named a Joint Auto-Encoder network,to solve the problem of outlier detection in water supply *** Joint Auto-Encoder network first expands the size of training data and extracts the useful features from the input data,and then reconstructs the input data effectively into an *** outliers are detected based on the network’s reconstruction errors,with a larger reconstruction error indicating a higher rate to be an *** water supply data,there are mainly two types of outliers:outliers with large values and those with values closed to *** set two separate thresholds,and,for the reconstruction errors to detect the two types of outliers *** data samples with reconstruction errors exceeding the thresholds are voted to be *** two thresholds can be calculated by the classification confusion matrix and the receiver operating characteristic(ROC)*** have also performed comparisons between the Joint Auto-Encoder and the vanilla Auto-Encoder in this paper on both the synthesis data set and the MNIST data *** a result,our model has proved to outperform the vanilla Auto-Encoder and some other outlier detection approaches with the recall rate of 98.94 percent in water supply data.

关键词： water supply data outlier detection auto-encoder deep learning

A new strategy for integrated urban water management in China：Sponge city

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Science China(Technological Sciences) 2018年第3期61卷 317-329页

作者： WANG Hao MEI Chao LIU JiaHong SHAO WeiWei China Institute of water resources and Hydropower Research State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin Beijing 100038 China School of Transportation and Civil Engineering & Architecture Foshan University Guangdong 528000 China Engineering and Technology Research center for water resources and hydroecology of the Ministry of water resources Beijing 100044 China

Urban water-related problems associated with rapid urbanization, including waterlogging, water pollution, the ecological degradation of water, and water shortages, have caused global concerns in recent years. In 2013, in order to mitigate increasingly severe urban water-related problems, China set forth a new strategy for integrated urban water management(IUWM) called the "Sponge City". This is the first holistic IUWM strategy implemented in a developing country that is still undergoing rapid urbanization, and holds promise for application in other developing countries. This paper aims to comprehensively summarize the sponge city. First, this paper reviews prior studies and policies on urban water management in China as important background for the sponge city proposal. Then, the connotations, goals, and features of the sponge city are summarized and ***, the challenges, research needs, and development directions pertinent to the sponge city are discussed based on investigations and studies conducted by the authors. The sponge city in China has a short history—given this, there are many issues that should be examined with regard to the stepwise implementation of the Sponge City Programme(SCP). Accordingly, the authors perceive this study as only the beginning of abundant studies on the sponge city.

关键词： flexible adaptation urban hydrological cycle low impact development green infrastructure

Dividing the transit wind speeds into intervals as a favorable methodology for analyzing the relationship between wind speed and the aerodynamic impedance of vegetation in semiarid grasslands

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Journal of Arid Land 2023年第8期15卷 887-900页

作者： LI Ruishen PEI Haifeng ZHANG Shengwei LI Fengming LIN Xi WANG Shuai YANG Lin College of water Conservancy and Civil Engineering Inner Mongolia Agricultural UniversityHohhot 010018China Key Laboratory of water resources Protection and Utilization of Inner Mongolia Autonomous Region Hohhot 010018China Autonomous Region Collaborative Innovation center for Integrated management of water resources and water Environment in the Inner Mongolia Reaches of the Yellow River Hohhot 010018China Inner Mongolia Autonomous Region management center of Sanshenggong Hydro-junction in the Yellow River Bayannur 015200China

In grassland ecosystems,the aerodynamic roughness(Z0)and frictional wind speed(u*)contribute to the aerodynamic impedance of the grassland ***,they are often used in the studies of wind erosion and ***,the effect of wind speed and grazing measures on the aerodynamic impedance of the grassland canopy has received less *** this study,we monitored wind speeds at multiple heights in grazed and grazing-prohibited grasslands for 1 month in 2021,determined the transit wind speed at 2.0 m height by comparing wind speed differences at the same height in both grasslands,and divided these transit wind speeds at intervals of 2.0 m/s to analyze the effect of the transit wind speed on the relationship among Z0,u*,and wind speed within the grassland *** results showed that dividing the transit wind speeds into intervals has a positive effect on the logarithmic fit of the wind speed *** dividing the transit wind speeds into intervals,the wind speed at 0.1 m height(V0.1)gradually decreased with the increase of Z0,exhibiting three distinct stages:a sharp change zone,a steady change zone,and a flat zone;while the overall trend of u*increased first and then decreased with the increase of *** the transit wind speeds into intervals improved the fitting relationship between Z0 and V0.1 and changed their fitting functions in grazed and grazing-prohibited *** to the computational fluid dynamic results,we found that the number of tall-stature plants has a more significant effect on windproof capacity than their *** results of this study contribute to a better understanding of the relationship between wind speed and the aerodynamic impedance of vegetation in grassland environments.

关键词： transit wind speeds frictional wind speed aerodynamic roughness computational fluid dynamic(CFD) grazed grassland grazing-prohibited grassland

Analysis of wave clipping effects of plain reservoir artificial islands based on MIKE21 SW model

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water Science and Engineering 2019年第3期12卷 179-187页

作者： Yan Xiang Zhi-min Fu Ying Meng Kai Zhang Zheng-fei Cheng Dam Safety management center of Ministry of water resources Nanjing Hydraulic Research Institute Nanjing 210029 China State Key Laboratory of Hydrology-water resources and Hydraulic Engineering Nanjing Hydraulic Research Institute Nanjing 210029 China Key Laboratory of Failure Mechanism and Safety Control Techniques of Earth-Rock Dam Ministry of Water Resources Nanjing Hydraulic Research Institute Nanjing 210029 China College of Hydrology and water resources Hohai University Nanjing 210098 China

Plain reservoirs are shallow, and have low dams and widespread water ***, wind-wave-induced damage to the dam is one of the important factors affecting the safety of the *** improve upon unsatisfactory plain reservoir wave-clipping schemes, a numerical method is proposed to predict and analyze waves in the reservoir in the presence of artificial islands, constructed from dredged *** MIKE21 SW model is applied to a specific plain reservoir for finding the optimal artificial island *** simulated wave height attenuation results are seen to agree well with empirically predicted ***, the validity and reliability of the numerical model are *** islands at suitable locations in the reservoir can attenuate the wave heights by approximately 10%e30%, which justifies the efficacy of the clipping scheme making use of dredging and island construction.

关键词： Plain reservoirs Sediment deposition Clipping via island construction MIKE21 SW Numerical simulation

Use of Human Excreta as Manure in Rural China

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Journal of Integrative Agriculture 2014年第2期13卷 434-442页

作者： LIU Ying HUANG Ji-kun Precious Zikhali School of Economics and management Beihang University center for Chinese Agricultural Policy Institute of Geographical Sciences and Natural Resources ResearchChinese Academy of Sciences International water management Institute Southern Africa Regional Office

Empirical research has shown that the use of manure significantly improves crop yield, soil fertility and water and moisture conservation. Despite these documented benefits, however, there is a concern on the downward trend of manure use in agriculture in China. This paper examines factors contributing to this downward trend, with a particular focus on human excreta used in agriculture. Empirical analysis based on data from stratified random sampling of rural households in five provinces of China shows that about 85% of human excreta was still used as manure in agriculture in 2007 which was less than a decade ago when nearly all human excreta was used as manure. Econometric results suggest that income growth, rising population density and improvement in rural transportation significantly contribute to declining use of human excreta as manure in agriculture. These results imply that the current downward trend will continue given China＇s rising economic growth, urbanization and rural infrastructural improvement.

关键词： manure human excreta recycling China