scholarly journals Impoundment Impact of the Three Gorge Reservoir on the Hydrological Regime in the Lower Han River, China

Water ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 1670
Author(s):  
Junhong Zhang ◽  
Luojie Feng ◽  
Sujie Chen ◽  
Tao Huang ◽  
Lu Chen ◽  
...  
Keyword(s):  
Hydrological Regime ◽  
Flow Regulation ◽  
Hydrological Processes ◽  
Han River ◽  
Hydrological Variability ◽  
Hydrological Changes ◽  
Gorge Reservoir ◽  
Discharge Ratio ◽  
Three Gorge Reservoir ◽  
Water Compensation

Reservoir regulation has been playing an increasingly important role in water resources development and its influence on the hydrological processes of downstream tributaries has attracted much attention. The lower Han River is selected as a case study to examine the hydrological and hydraulic influence of the upstream flow regulation of the Three Gorges Reservoir (TGR) in the middle Yangtze River, China. Based on a hydrodynamic model and the observed data, the hydrological processes in the lower Han River were simulated and their changes were analyzed under the impoundment influences of the TGR. The results indicated that there were obviously hydrological changes in the lower Han River after the TGR operation. The decreased stage downstream the TGR during the impounding periods of the TGR resulted in an increase in the stage difference, current speed, hydraulic gradient and the discharge ratio. In addition, the stage difference between the two rivers was decreased during the periods of water compensation from the TGR, which led to the outflow congestion in the lower Han River. The hydrological changes in the lower Han River were the response to the flow regulation of the TGR and the inflow of the two rivers. The variation in the rating curve in the lower Han River mainly resulted from the stage difference between the two rivers during the dispatching periods of the TGR. These results help to explain the hydrological variability under the impounding influence of the TGR for the lower Han River and they can be extended to other river tributaries downstream to the reservoirs.

scholarly journals Identification of the degree of impact of dams on the hydrologic regime of semi-arid rivers: an evaluation of the DHRAM method

RBRH ◽  
2017 ◽  
Vol 22 (0) ◽  
Author(s):  
Naiah Caroline Rodrigues de Souza ◽  
◽  
Andrea Sousa Fontes ◽  
Lafayette Dantas da Luz ◽  
Sandra Maria Conceição Pinheiro ◽  
...  
Keyword(s):  
Hydrological Regime ◽  
Flow Regulation ◽  
Hydrologic Regime ◽  
Local Conditions ◽  
Operating Rules ◽  
Hydrologic Variability ◽  
High Degree ◽  
The Impact ◽  
Semi Arid

ABSTRACT The flow regulation that results from the implantation of dams causes consequences to the river ecosystems due to the modification on the characteristics of the hydrologic regime. The investigation of these changes become relevant, mainly in semi-arid regions where there is a great amount of these hydraulic structures and lack of such analyzes. Considering the above, this paper aims to evaluate the Dundee Hydrological Regime Alteration Method (DHRAM) through the classification of the degree of impact of dams located on rivers Itapicuru, Paraguaçu and their tributaries, verifying the adequacy of its use to represent the semi-arid hydrologic regime. Thereby, the DHRAM was applied in three versions: considering the thresholds that define the scores to classify the degree of impact in its original set (accordingly to Black et al. (2005)); with the adjustment of those thresholds to local conditions; and, with the regrouping of variables and adjustment of thresholds. The results showed that the method in its original set is applicable to semi-arid rivers, however it tends to be very restrictive against the high natural hydrologic variability characteristic of these rivers, and it ends up pointing to a high degree of alteration for dams that are known for not causing a very siginifcant flow regulation. The DHRAM with the regrouping of variables and the adjustment of thresholds presented the classification that approached the most to the known characteristics of the studied dams, being useful for the evaluation of the impact of dams still in project, and also to guide the adoption of operating rules that minimize the most significant hydrologic alterations that are identified.

scholarly journals Recent changes to the hydrological cycle of an Arctic basin at the tundra–taiga transition

2018 ◽  
Vol 22 (7) ◽  
pp. 3993-4014 ◽  
Author(s):  
Sebastian A. Krogh ◽  
John W. Pomeroy
Keyword(s):  
Layer Thickness ◽  
Active Layer ◽  
Snow Water Equivalent ◽  
Hydrological Cycle ◽  
Arctic Basin ◽  
Hydrological Processes ◽  
Active Layer Thickness ◽  
Blowing Snow ◽  
Hydrological Changes ◽  
The Impact

Abstract. The impact of transient changes in climate and vegetation on the hydrology of small Arctic headwater basins has not been investigated before, particularly in the tundra–taiga transition region. This study uses weather and land cover observations and a hydrological model suitable for cold regions to investigate historical changes in modelled hydrological processes driving the streamflow response of a small Arctic basin at the treeline. The physical processes found in this environment and explicit changes in vegetation extent and density were simulated and validated against observations of streamflow discharge, snow water equivalent and active layer thickness. Mean air temperature and all-wave irradiance have increased by 3.7 ∘C and 8.4 W m−2, respectively, while precipitation has decreased 48 mm (10 %) since 1960. Two modelling scenarios were created to separate the effects of changing climate and vegetation on hydrological processes. Results show that over 1960–2016 most hydrological changes were driven by climate changes, such as decreasing snowfall, evapotranspiration, deepening active layer thickness, earlier snow cover depletion and diminishing annual sublimation and soil moisture. However, changing vegetation has a significant impact on decreasing blowing snow redistribution and sublimation, counteracting the impact of decreasing precipitation on streamflow, demonstrating the importance of including transient changes in vegetation in long-term hydrological studies. Streamflow dropped by 38 mm as a response to the 48 mm decrease in precipitation, suggesting a small degree of hydrological resiliency. These results represent the first detailed estimate of hydrological changes occurring in small Arctic basins, and can be used as a reference to inform other studies of Arctic climate change impacts.

Impact of water quality on the microbial diversity in the surface water along the Three Gorge Reservoir (TGR), China

2019 ◽  
Vol 181 ◽  
pp. 412-418 ◽  
Author(s):  
Aping Niu ◽  
Li-Yan Song ◽  
Yang-Hui Xiong ◽  
Chun-Jiao Lu ◽  
Muhammad Junaid ◽  
...  
Keyword(s):  
Water Quality ◽  
Surface Water ◽  
Microbial Diversity ◽  
Gorge Reservoir ◽  
Three Gorge Reservoir

Nitrogen characteristics in sediments of Xiangxi Bay, China Three-Gorge Reservoir

2012 ◽  
Vol 28 (1) ◽  
pp. 45-51 ◽  
Author(s):  
Hua-Jun Luo ◽  
De-Fu Liu ◽  
Ying-Ping Huang
Keyword(s):  
Gorge Reservoir ◽  
Xiangxi Bay ◽  
Three Gorge Reservoir

Distribution of phytoplankton in the Three-Gorge Reservoir during rainy and dry seasons

2006 ◽  
Vol 367 (2-3) ◽  
pp. 999-1009 ◽  
Author(s):  
Hui Zeng ◽  
Lirong Song ◽  
Zhigang Yu ◽  
Hongtao Chen
Keyword(s):  
Gorge Reservoir ◽  
Three Gorge Reservoir ◽  
Dry Seasons

Modeling runoff and soil erosion in the Three-Gorge Reservoir drainage area of China using limited plot data

2013 ◽  
Vol 492 ◽  
pp. 163-175 ◽  
Author(s):  
A-Xing Zhu ◽  
Ping Wang ◽  
Tongxin Zhu ◽  
Lajiao Chen ◽  
Qiangguo Cai ◽  
...  
Keyword(s):  
Soil Erosion ◽  
Drainage Area ◽  
Gorge Reservoir ◽  
Three Gorge Reservoir
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