检索结果-南通市图书馆

Tidal Level Response to Sea-Level Rise in the Yangtze Estuary

China Ocean Engineering 2012年第1期26卷 109-122页

作者：龚政张长宽万里明左军成 State Key Laboratory of hydrology-water resources and Hydraulic Engineering Hohai University Yangtze River Estuary survey bureau of hydrology and water Resource Ministry of Water Resources

The rise of tidal level in tidal reaches induced by sea-level rise has a large impact on flood control and water supply for the regions around the estuary. This paper focuses on the variations of tidal level response along the tidal reaches in the Yangtze Estuary, as well as the impacts of upstream discharge on tidal level response, due to the sea-level rise of the East China Sea. Based on the Topex/Poseidon altimeter data obtained during the period 1993-2005, a stochastic dynamic analysis was performed and a forecast model was run to predict the sea-level rise of the East China Sea. Two- dimensional hydrodynamic numerical models downscaling from the East China Sea to estuarine areas were implemented to analyze the rise of tidal level along the tidal reaches. In response to the sea-level rise, the tidal wave characteristics change slightly in nearshore areas outside the estuaries, involving the tidal range and the duration of flood and ebb tide. The results show that the rise of tidal level in the tidal reaches due to the sea-level rise has upstream decreasing trends. The step between the stations of Zhangjiagang and Shiyiwei divides the tidal reaches into two parts, in which the tidal level response declines slightly. The rise of tidal level is 1-2.5 mm/a in the upper part, and 4-6 mm/a in the lower part. The stations of Jiangyin and Yanglin, as an example of the upper part and the lower part respectively, are extracted to analyze the impacts of upstream discharge on tidal level response to the sea-level rise. The relation between the rise of tidal level and the upstream discharge can be fitted well with a quadratic fimction in the upper part. However, the relation is too complicated to be fitted in the lower part because of the tide dominance. For comparison purposes, hourly tidal level observations at the stations of Xuliujing and Yanglin during the period 1993-2009 are adopted. In order to uniform the influence of upstream discharge on tidal level for a certain

关键词： Yangtze Estuary sea-level r&e stochastic dynamic analysis and forecast model tidal reaches," dischargeincrement

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Monitoring Glacial Shrinkage Using Remote Sensing and Site-Observation Method on Southern Slope of Kalik Mountain, Eastern Tian Shan, China

引用

Journal of Earth Science 2011年第4期22卷 503-514页

作者：王文彬李开明高建芳 State Key Laboratory of Cryospheric Sciences/Tianshan Glaciological Station Cold and Arid Region Environmental and Engineering Research Institute Chinese Academy of Sciences hydrology and water resources survey bureau of hami

Currently, one of the effective means in monitoring glacier change in regional scale is remote sensing and site-observation method. In this article, we present a study of comparing glacier area in 2005 derived from SPOT5 satellite image with area in 1972 derived from topographic maps. Moreover, Miaoergou （庙儿沟） flat-summit glacier is site observed to verify glacial change in regional scale. During the study period, glaciers located in the southern slope of Kalik （喀尔里克） Mountain re- duced their area by 12.3%. The high individual change indicates that the wastage corresponding to area changes has been the dominant process of glacier mass loss in this region. Glaciers smaller than the mean size （1.3 km2）, especially those 〈0.5 km2, lost more of their area with high variability and yielding two glaciers vanished. It is suggested that small glaciers are prone to disappear under such climate conditions in future years. With the difference supplied by upstream glaciers, there appears great disparity trend of river runoff recently. Seen from decade-scale, the discharge, the lower gla- cier-covered catchment, is decreased because of strong consumption of small glaciers during the past decades. Owing to the rivers that are supplied by more meltwater from medium and larger glaciers mainly, the trend of the river runoff increase is still going on. Trends of river runoff of three different glacier-covered catchments exhibit distinctive results. This implies that retreating glaciers will reduce the ability to regulate the water circulation.

关键词： glacier change Kalik Mountain remote sensing runoff water resource.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Impact of anthropogenic drivers on subaqueous topographical change in the Datong to Xuliujing reach of the Yangtze River

引用

Science China Earth Sciences 2018年第7期61卷 940-950页

作者： Shuwei ZHENG Heqin CHENG Shengyu SHI Wei XU Quanping ZHOU Yuehua JIANG Fengnian ZHOU Minxiong CAO State Key Laboratory of Estuarine and Coastal Research East China Normal University Nanjing Geological survey Center China Geological Survey Yangtze River water resources Commission Yangtze River Hydrology and Water Resources Survey Bureau Nanjing Hydraulic Research Institute State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering

Changes of subaqueous topography in shallow offshore water pose safety risks for embankments,navigation,and *** study conducted measurements of subaqueous topography between Datong and Xuliujing in the Yangtze River using a Sea Bat 7125 multi-beam echo sounder,and the channel change from 1998 to 2013 was calculated using historical bathymetry *** study revealed several important results:(1)the overall pattern of changes through the studied stretch of the river was erosion–deposition–*** with a volume 700×10~6m^3occurred in the upper reach,deposition of about 204×10~6m^3occurred in the middle reach,and erosion of about 602×10~6m^3occurred in the lower reach.(2)Dunes are the most common microtopographic feature,accounting for 64.3%of the Datong to Xuliujing reach,followed by erosional topography and flat river topography,accounting for 27.6%and 6.6%,respectively.(3)Human activities have a direct impact on the development of the *** instance,the mining of sand formed holes on the surface of dunes with lengths of 20–35 m and depths of 3–5 *** concluded that the overall trend of erosion(net erosion volume of 468×10~6m^3)occurred in the study area mainly because of the decreased sediment discharge following the closure of the Three Gorges ***,other human activities were also impact factors of topographic *** of embankments and channel management reduced channel width,restricted river meandering,and exacerbated the erosion phenomenon.

关键词： Subaqueous topographical Human activities Multi-beam echo sounder High resolution Yangtze River

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Time of the Tengchong-Lianghe Movement in Southwest Yunnan

引用

Acta Geologica Sinica(English Edition) 2015年第2期89卷 674-675页

作者： WANG Shubing WANG Yuzhen JIANG Fuchu TIAN Guoqiang Institute of Geomechanics Chinese Academy of Geological Sciences Henan Xinyang hydrology and water resources survey bureau

The Tengchong-Lianghe movement, proposed and named by Chen et al （ 1991 ）, is an important tectonic event occurred from the late stage of middle Pleistocene to the early stage of the late Pleistocene in the Tenchong Block of southwest Yunnan. It reactivated the old faults in the region, and tilted, folded and fractured the Q1 and Q2 strata, resulting in the common angular unconformity between them. In addition, this region entered into an erosion-cutting stage, with its cutting depth reaching up to tens of meters, and formed very striking high lake terraces.

关键词： Chen In Time of the Tengchong-Lianghe Movement in Southwest Yunnan

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Responses of river bed evolution to flow-sediment process changes after Three Gorges Project in middle Yangtze River:A case study of Yaojian reach

引用

water Science and Engineering 2020年第2期13卷 124-135页

作者： Li-qin Zuo Yong-jun Lu Huai-xiang Liu Fang-fang Ren Yuan-yuan Sun State Key Laboratory of hydrology-water resources and Hydraulic Engineering Nanjing Hydraulic Research InstituteNanjing 210029China Middle Changjiang River survey bureau of hydrology and water resources Wuhan 430010China

The Three Gorges Project(TGP)has changed the flow-sediment process in the middle Yangtze *** navigation purposes,there is an urgent need to study the changes of the river regime over a long-term period and the shoal-channel evolution over different seasons since the completion of the *** on analysis of the measured data and the results of a two-dimensional mathematical model,the changes of the river regime and river bed evolution in the Yaojian reach downstream of the TGP were *** show that a high sediment transport flux helps to keep the main flow in the North Branch,while a low sediment transport flux helps to keep the main flow in the South ***,the main branch will not change in the near future because of the low sediment transport *** this study,the flow-sediment process adjusted by the TGP was restored to the conditions before the TGP,and the river bed evolution under the adjusted and non-adjusted flow-sediment conditions was *** the completion of the TGP,the reservoir storage accelerated the flood recession process and decreased the erosion by 11.9%under the flow-sediment conditions in 2010,and the deposition in the flood season decreased by 56.4%.

关键词： River regime River bed evolution Flow-sediment process Three Gorges Project Yaojian reach Middle Yangtze River Navigation channel

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Analysis on Hydrological Regimes of the Medium and Small Rivers in hami of Xinjiang——Take Toudaogou Basin as an Example

引用

Meteorological and Environmental Research 2013年第10期4卷 37-40,44页

作者： Ruozihan Tayier Guangxiao Luo hydrology and water resources survey bureau in hami of Xinjiang

[ Objective] The research aimed to analyze hydrological regimes of the medium and small rivers in hami of Xinjiang. [ Method] According to actual observation data at Toudaogou hydrological station during 1956 -2010, climate, runoff, flood, sediment and water quality in the basin were analyzed. [ Result] Runoff in Toudaogou River was mainly from bedrock fissure water and rainfall, and depended on temperature and precipi- tation in the catchment zone. Runoff in Toudaogou River had very big change during the year. Runoff in whole year mainly concentrated during April -June, which occupied 57.9% of annual runoff. Flood in Toudaogou basin was divided into spring and summer flood from time, and snowmelt and rainstorm flood from type. Sediment load was related to terrain, gradient, runoff, precipitation, flood and process. Suspended sediment load at Toudaogou hydrological station had close relationship with the annual maximum flow capacity of flood peak, and related coefficient was 0.917. [ Conclusion] Hydrological regime in Toudaogou basin basically represented corresponding hydrological information of rivers without glacier water supply in hami even whole western arid zone of China. The research could provide theoretical basis for scientifically using water resources of the medium and small rivers in the zone.

关键词： Hydrological regime Medium and small dvers Toudaogou basin hami of Xinjiang China

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

A Novel Routing Strategy to Provide Source Location Privacy in Wireless Sensor Networks

引用

Wuhan University Journal of Natural Sciences 2016年第4期21卷 298-306页

作者： LI Shuming XIAO Yan LIN Qiaomin QI Zhuzhu Downstream hydrology and water resources survey bureau Yangtze River Water Conservancy Committee College of Computer Nanjing University of Posts and Telecommunications

In order to secure the source location privacy when information is sent back to the base station in wireless sensor network, we propose a novel routing strategy which routes the packets to the base station through three stages： directional random routing, h-hop routing in the annular region and the shortest path routing. These stages provide two fold protections to prevent the source location from being tracked down by the adversary. The analysis and simulation results show that proposed scheme, besides providing longer safety period, can significantly reduce energy consumption compared with two baseline schemes.

关键词： source location privacy wireless sensor networks(WSN) safety period energy efficiency

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

water level updating model for flow calculation of river networks

引用

water Science and Engineering 2014年第1期7卷 60-69页

作者： Xiao-ling WU Xiao-hua XIANG Li LI Chuan-hai WANG College of hydrology and water resources Hohai University State Key Laboratory of hydrology-water resources and Hydraulic Engineering Hohai University Zhenjiang Engineering survey and Design Institute Co. Ltd.

Complex water movement and insufficient observation stations are the unfavorable factors in improving the accuracy of flow calculation of river networks. A water level updating model for river networks was set up based on a three-step method at key nodes, and model correction values were collected from gauge stations. To improve the accuracy of water level and discharge forecasts for the entire network, the discrete coefficients of the Saint-Venant equations for river sections were regarded as the media carrying the correction values from observation locations to other cross-sections of the river network system. To examine the applicability, the updating model was applied to flow calculation of an ideal river network and the Chengtong section of the Yangtze River. Comparison of the forecast results with the observed data demonstrates that this updating model can improve the forecast accuracy in both ideal and real river networks.

关键词： plain river network cyclic looped channel network water level updating model hydrodynamic model, error correction

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Quantifying both climate and land use/cover changes on runoff variation in Han River basin, China

引用

Frontiers of Earth Science 2022年第3期16卷 711-733页

作者： Jing TIAN Shenglian GUO Jiabo YIN Zhengke PAN Feng XIONG Shaokun HE State Key Laboratory of water resources and Hydropower Engineering Science Wuhan UniversityWuhan 430072China Changjiang Institute of survey PlanningDesign and ResearchWuhan 430010China bureau of hydrology Changjiang Water Resources CommissionWuhan 430010China

Climate change and land use/cover change(LUCC)can both exert great impacts on the generation processes of precipitation and ***,previous studies usually neglected considering the contribution component of future LUCC in evaluating changes in hydrological *** this study,an integrated framework is developed to quantify and partition the impact of climate change and LUCC on future runoff ***,a daily bias correction(DBC)method and the Cellular Automaton-Markov(CA-Markov)model are used to project future climate and LUCC scenarios,and then future runoff is simulated by the calibrated Soil and water Assessment Tool(SWAT)model with different climate and LUCC ***,the uncertainty of future runoff and the contribution rate of the two driving factors are systematically *** Han River basin in China was selected as a case *** indicate that:1)both climate change and LUCC will contribute to future runoff intensification,the variation of future runoff under combined climate and LUCC is larger than these under climate change or LUCC alone;2)the projected uncertainty of median value of multi-models under RCP4.5(RCP8.5)will reach 18.14%(20.34%),12.18%(14.71%),11.01%(13.95%),and 11.41%(14.34%)at Baihe,Ankang,Danjiangkou,and Huangzhuang stations,respectively;3)the contribution rate of climate change to runoff at Baihe,Ankang,Danjiangkou,and Huangzhuang stations under RCP4.5(RCP8.5)are 91%-98%(84%-94%),while LUCC to runoff under RCP4.5(RCP8.5)only accounts for 2%-9%(6%-16%)in the annual *** study may provide useful adaptive strategies for policymakers on future water resources planning and management.

关键词： climate change LUCC runoff response uncertainty analysis contribution rate

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Variations in the effective and bankfull discharge for suspended sediment transport due to dam construction

引用

Frontiers of Earth Science 2022年第2期16卷 446-464页

作者： Fan CHEN Li CHEN Wei ZHANG Jing YUAN Kanghe ZHANG State Key Laboratory of water resources and Hydropower Engineering Science Wuhan UniversityWuhan 430072China Changjiang Institute of survey PlanningDesign and ResearchWuhan 430010China bureau of hydrology Changjiang Water Resources CommissionWuhan 430010China

A varied class method is applied to calculate the effective discharges and their variations after the Three Gorges Dam(TGD)construction based on the mean daily flow discharge and suspended sediment concentration field data from 1981 to *** comparison,the bankfull discharges are also determined according to the cross-section profiles and flow discharge-stage *** results show that a bimodal effective discharge curve usually exists at the fixed sites,which generates two effective discharges(Q_(e1) and Q_(e2))within the moderate flow *** the quasi-equilibrium circumstances of the pre-dam period,effective discharges are closely related to the mean annual runoff,with a narrow range of regional variations in occurrence *** analyses draw the conclusion that the relatively higher unsaturation degrees of the pre-dam effective discharges caused by dam interception and riverbed coarsening are the primary cause of the increase in effective discharges from Yichang to Shashi,while the more frequent low and medium discharges due to flow regulation drive the decrease in effective discharges from Jianli to *** slightly elevated flood levels and descending bankfull levels collaboratively result in the decrease of bankfull discharges from Yichang to Shashi,while the lowered bed elevation causes the increase in bankfull discharges from Luoshan to ***,the bankfull discharge in the Middle and Lower Yangtze River is larger than effective discharge and approaches the 1.5-year recurrence interval discharge.

关键词： effective discharge bankfull discharge unsaturation degree flow-sediment regimes Middle and Lower Yangtze River Three Gorges Dam

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：