Showing 121 - 140 results of 190 for search '"Macao"', query time: 0.04s Refine Results
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    Model Test and Numerical Simulation Analysis on Freezing Effect of Different Freezers in Freeze-Sealing Pipe-Roof Method by Haibing Cai, Yujie Liu, Rongbao Hong, Mengkai Li, Zongjin Wang, Hanglong Ding

    Published 2022-01-01
    “…The Gongbei Tunnel Project is a key phased project of the Zhuhai Connection Line of the Hong Kong–Zhuhai–Macao Bridge, and the freeze-sealing pipe-roof (SFPR) method was first applied successfully. …”
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  4. 124

    Health of Fish Communities in the Lower Reaches of the Dongjiang River by MA Zhuoluo, HU Lianghe, JIANG Renfei, WANG Sai

    Published 2023-01-01
    “…Dongjiang River is an important water source and ecological corridor in the Guangdong-Hong Kong-Macao Greater Bay Area.Understanding the health of fish communities in the lower reaches of this river is vital for the water ecological protection of the basin.This paper investigates the fish in the lower reaches of the Dongjiang River,and the abundance index (d<sub>M</sub>) and Shannon Weiner index (H′) are selected to evaluate the community health,and the relationship between them and water quality factors is explored.The results show that there are 7 orders,19 families,43 genera,and 50 species of fish found in the lower reaches of this river,of which Cypriniformes is the largest and Perciformes is the second,with 10 species of exotic fish.There is a significant or extremely significant negative correlation between the health of fish communities and water pollution factors such as COD<sub>Cr</sub>,BOD<sub>5</sub>,and TP,indicating that water pollution affects the health of fish communities.The river encroachment,rigid transformation,and the construction of gate and dam facilities disrupting habitats have also adversely influenced fish communities.Exotic fish have been found in most sampling sites and are more dominant in polluted rivers.It is necessary to develop scientific management strategies and measures from various aspects,including improving river water quality,restoring the diversity and connectivity of fish habitats,and strengthening the management and prevention of exotic fish. …”
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  5. 125

    Substantial increases in compound climate extremes and associated socio-economic exposure across China under future climate change by Pei Fang, Taihua Wang, Dawen Yang, Lihua Tang, Yuting Yang

    Published 2025-01-01
    “…The projected changes will escalate socio-economic exposure across China’s major urban clusters, among which Guangdong-Hong Kong-Macao will face the highest risk. Our findings underscore the necessity of carbon emission controls, and call for adaptive measures to mitigate the threats induced by rising compound hazards in a changing climate.…”
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    Measured Wave Characteristics in Pearl River Estuary under Typhoon Impact by ZHU Xiaowei, HOU Peng, LIU Xiaojian, WANG Qisong, WANG Qiang, GUO Huiqun, LIU Qinqin

    Published 2023-01-01
    “…The nearshore wave environment of the Pearl River Estuary is significantly affected by typhoons.Based on the buoy observation data in Macao waters of the Pearl River Estuary,wave characteristic parameters (wave height,wave direction,wave period,etc.) and their correlation during the impact of 11 typhoons from 2017 to 2022 were analyzed,and the impact of typhoons on the nearshore wave environment at the Pearl River Estuary was studied.The results show a high correlation between the maximum wave height and the significant wave height,between the one-tenth of the large waves and the significant wave height,and between the significant wave period and the significant wave height,and then the empirical formula is fitted.During the typhoon influence in this area,the main wave direction is SSE with a frequency of about 37.92%;the secondary wave direction is S with a frequency of about 26.11%.For the extreme waves with a significant wave height of greater than 3 m and a maximum wave height of greater than 4 m,the frequencies are 0.65% and 1.95%,respectively.The wave direction is mainly distributed in ENE-SSW.For long-period waves with a mean wave period of greater than 6 s,the wave direction is mainly distributed in ESE-S,with a frequency of about 12.86%.These wave parameters relationships and characteristics can provide references for the design and research of coastal protection projects such as seawalls and breakwaters in the Pearl River Estuary.…”
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    Optimization of Flood Dispatch Scheme in Upstream of Beijiang River Based on Traceability Analysis by QIN Yehongping, LI Ningning, TAN Chao, LIU Zhimin, XU Jingfeng

    Published 2024-01-01
    “…In order to deeply understand the new situation and demand for flood control in the upstream of Beijiang River and ensure the safety of key flood control and protection objects in the upstream, the Pearl River Delta in the downstream, and the Guangdong-Hong Kong-Macao Greater Bay Area, research was conducted on the practical dispatch results of the "22·6" and "24·4" Beijiang major floods. …”
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    Study on Attribution Analysis and Response of Saltwater Intrusion in Modaomen Waterway During Dry Seasons by HUANG Chunhua, LIN Zhongyuan, ZOU Huazhi, HUANG Pengfei, XU Wei

    Published 2023-01-01
    “…Under the influence of climate change and human activities, the saltwater intrusion in the Modaomen Estuary Waterway has intensified significantly,which has greatly threatened the safety of the water supply in the Guangdong-Hong Kong-Macao Greater Bay Area.Based on the daily exceedance time data of seven stations in the Modaomen Waterway,daily maximum tidal range,volume of runoff, mean sea level,cross-shore wind,and alongshore wind from 2004 to 2016,empirical orthogonal function (EOF) analysis and univariate and multiple linear regression analysis were carried out to reveal the response relationship between the saltwater intrusion and the impact factors and quantify the contribution of each impact factor.The results show that the maximum contribution to the saltwater intrusion is the tidal range,followed by the volume of runoff, which can explain 30% and 28% of the diurnal variation of the exceedance time, respectively.The contribution of wind to the saltwater intrusion is slightly greater than that of the mean sea level,and the contribution of wind and mean sea level to the saltwater intrusion is 12% and 11%,respectively.The effect of cross-shore wind is slightly greater than that of alongshore wind.The peak of Modaomen saltwater intrusion appears in 3.2 days after the minimum tidal range,and the salinity of Modaomen Waterway is not suppressed until 1.8 days after the increase in the volume of runoff of Gaoyao station.This paper can provide theoretical support for watershed scheduling and saltwater intrusion forecast.…”
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  12. 132

    Analysis of Agricultural Non-point Source Pollution in A Small Watershed in Typical Mountainous Areas at Dongjiang Headwaters ——Taking the Dongjiang Watershed in Dingnan County as... by ZENG Jinfeng, PAN Hong, ZHANG Linan, ZHONG Jianhong, XIE Shuishi, ZHOU Shaomei

    Published 2023-01-01
    “…The current situation of agricultural non-point source pollution in a small watershed in typical mountainous areas at Dongjiang Headwaters were investigated and analyzed,and the agricultural non-point source pollution sources,pollution load and pollution load intensity in this watershed were analyzed,so as to provide a reference for ensuring the safety of water sources in the Guangdong-Hong Kong-Macao Greater Bay Area and promoting the precise pollution control in the watershed.The pollution types such as human settlements,agricultural planting,livestock and poultry breeding and aquaculture in the Dongjiang River Basin of Dingnan County were classified and investigated at the scale of county and township.The pollution load and pollution load intensity were estimated using the output coefficient method and the equivalent pollution load method,and the spatial distribution of pollutants was analyzed by clusteranalysis and ArcGIS.It was found that the main pollutants from agricultural non-point sources in the Dongjiang River Basin of Dingnan County were TN and NH<sup>+</sup><sub>4</sub>-N,which mainly came from human settlements and agricultural planting,and the pollution sources were concentrated in Lishi Town and Egong Town.Strengthening residents' awareness of water environmental protection,speeding up the construction of supporting sewage pipe networks,strengthening the operation and management of sewage equipments,and rationally applying nitrogen and phosphate fertilizers are of great significance for promoting the continuous emission reduction of agricultural non-point source pollution in the mountainous watershed at Dongjiang Headwaters.…”
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    Analysis of Temporal and Spatial Evolution Characteristics of Rainfall in Dongguan in the Past 30 Years by WANG Qiuliang, SUN Xiang, GAN Dufen, MEI Xinpei, CHENG Jie, ZAN Xiongfeng

    Published 2022-01-01
    “…Dongguan is an important city in the Guangdong-Hong Kong-Macao Greater Bay Area,which is a major contributor to the economic development of this area.However,its urban planning,rational allocation of water resources,flood prevention and disaster reduction are severely affected by torrential rain and floods,and thus its high-quality economic development is seriously hindered.Therefore,by using the 32-year daily rainfall data of 30 hydrological stations in Dongguan,this paper adopts methods such as GIS,the Mann-Kendall test,moving average,and cumulative anomaly to discuss the temporal and spatial distribution of rainfall in Dongguan.The results reveal that in the past 32 years,the temporal and spatial distribution of annual rainfall has gradually increased from west to east with a significant rising trend over time.During the flood season,the rainfall increases sequentially from west to east and gradually decreases from the central part to west,and from the central part to east,it drops before it rises.Rainfall in the flood season accounts for about 60%~95% of the annual total.The rainfall in the non-flood season is prominent in the central part,with great differences between east and west,namely that the rainfall in the central part tends to decrease gradually to both sides,and the southwestern part registers the smallest.The center of the maximum rainfall in the four seasons moves from the central part to the northeast,east,and central,and the southwest still records the minimum rainfall.The monthly average rainfall generally shows an increasing trend from west to east:Many years of data indicates that the average rainfall in June is the largest,accounting for 18.58% of the rainfall all year,while December sees the smallest,accounting for 1.88% of the yearly total.The research results can provide reference and support for the later development of Dongguan.…”
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    Sustainable Development of Water Resources Carrying Capacity Based on System Dynamics: A Case Study of Ganzhou City by WANG Xiaojun, YANG Huan, LI Zhenping, YAN Wenfeng, LAN Sijiao, DU Chao

    Published 2022-01-01
    “…As Ganzhou is the birthplace of Ganjiang River,Dongjiang River,and Beijiang River (“Three Rivers”),the security and sustainable development of its water resources are of great significance to the ecological security and sustainable development of both the Yangtze River Economic Belt downstream and the Guangdong-Hongkong-Macao Greater Bay Area.Thus,seeking the optimal sustainable development mode that Ganzhou's water resources can carry and ensuring the safety and sustainable use of those water resources are currently urgent issues to be solved.In this study,we employ the system dynamics method to build a system dynamics model of Ganzhou's water resources carrying capacity by analyzing its influencing factors and the system feedback loop and dividing the carrying capacity system into three sub-systems of social economy,water resources,and water environment.Moreover,four scenarios of normal development,economic priority,environmental priority,and comprehensive and coordinated development are designed to simulate Ganzhou's water resources carrying capacity during 2020—2035 and dynamically evaluate and simulatively predict its sustainable development capacity under each scenario.The results indicate that among the four scenarios,all the normal development and economic priority scenarios that sorely pursue the continuation of the current development status of social economy and the environmental priority scenario that protects water resources at the expense of social economy development fail to guarantee the sustainable development of water resources and social economy.In contrast,under the comprehensive and coordinated development mode,the chemical oxygen demand (COD) emissions will remain at a low level of 132 900 t by 2035 while economic development rises to a relatively high level,with GDP reaching 1 197.13 billion CNY.It follows that this mode not only ensures economic development but also takes into account the ecological environment.Therefore,the comprehensive and coordinated development scenario that comprehensively considers social economy development,environmental protection,and other factors is the optimal sustainable development mode that can be carried by water resources.…”
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