Flow regime of the three outlets on the south bank of Jingjiang River, China: an impact assessment of the Three Gorges Reservoir for 2003–2010

Zhang, Shuanghu; Xu, Weihua; Ben-de, Wang; Wang, Hao

doi:10.1007/s00477-015-1121-6

Cited by 20 publications

(11 citation statements)

References 17 publications

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“…There is also obvious reduction in the total inflows (Figure 7c), in which, generally reduction from four branched rivers (Figure 7d) and seriously decline of the inflow from three outlets (Figure 7e) during the period 2003-2014 (black line in the Figure 7). The inflow decline from three outlets may attribute to the inflow reduction to the TGR, operation function of TGR and TGR-induced variation in the river-lake relationship, which is occupied 68.9%, 13.9% and 17.2%, respectively [54]. Compared to the other sub-periods, the 12-year flow declines may mainly be driven by the smaller rainfalls in the controlled catchments.…”

Section: Impacted Factors Identification and Analysis For The Inter-amentioning

confidence: 98%

Analysis of Long-Term Water Level Variation in Dongting Lake, China

Han

Zhang

Huang

et al. 2016

Water

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Abstract:The water level of Dongting Lake has changed because of the combined impact of climatic change and anthropogenic activities. A study of the long-term statistical properties of water level variations at Chenglingji station will help with the management of water resources in Dongting Lake. In this case, 54 years of water level data for Dongting Lake were analyzed with the non-parametric Mann-Kendall trend test, Sen's slope test, and the Pettitt test. The results showed the following: (1) Trends in annual maximum lake water level (WLM), annual mean lake water level (WL), and annual minimum lake water level (WLm) increased from 1961 to 2014; however, the three variables showed different trends from 1981 to 2014; (2) The annual change trends in Dongting Lake between 1961-2014 and 1981-2014 were found to be from approximately 0.90 cm/year to´2.27 cm/year, 1.65 cm/year to´0.79 cm/year, and 4.58 cm/year to 2.56 cm/year for WLM, WL, and WLm, respectively; (3) A greater degree of increase in water level during the dry season (November-April) was found from 2003 to 2014 than from 1981 to 2002, but a smaller degree of increase, even to the point of decreasing, was found during the wet season (May-October); (4) The measured discharge data and numerical modeling results showed the operation of Three Gorge Reservoir (TGR) pushed to influence partly the recent inter-annual variation of water level in Dongting Lake region, especially in the flood and dry seasons. The analysis indicated that the water level of Dongting Lake has changed in the long term with decreasing of range between WLM and WLm, and may decrease the probability of future drought and flood events. These results can provide useful information for the management of Dongting Lake.

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Section: Impacted Factors Identification and Analysis For The Inter-amentioning

confidence: 98%

Analysis of Long-Term Water Level Variation in Dongting Lake, China

Han

Zhang

Huang

et al. 2016

Water

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“…Several studies used the merit of the availability of long time series data to compare before and after the construction of the hydropower reservoirs (e.g. Ye et al, 2003;Adam et al, 2007;Adam and Lettenmaier, 2008;Arrigoni et al, 2010;Ahn and Merwade, 2014;Tang et al, 2014;Zhang et al, 2015). However, without the required after-construction data, such comparative visualization and characterization of impacts become immensely challenging.…”

Section: Modelling Discharge Release From Operating Hydropower Reservmentioning

confidence: 99%

Quantifying human impacts on hydrological drought using a combined modelling approach in a tropical river basin in central Vietnam

Firoz¹,

Nauditt²,

Fink

et al. 2018

Hydrol. Earth Syst. Sci.

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Abstract. Hydrological droughts are one of the most damaging disasters in terms of economic loss in central Vietnam and other regions of South-east Asia, severely affecting agricultural production and drinking water supply. Their increasing frequency and severity can be attributed to extended dry spells and increasing water abstractions for e.g. irrigation and hydropower development to meet the demand of dynamic socioeconomic development. Based on hydro-climatic data for the period from 1980 to 2013 and reservoir operation data, the impacts of recent hydropower development and other alterations of the hydrological network on downstream streamflow and drought risk were assessed for a mesoscale basin of steep topography in central Vietnam, the Vu Gia Thu Bon (VGTB) River basin. The Just Another Modelling System (JAMS)/J2000 was calibrated for the VGTB River basin to simulate reservoir inflow and the naturalized discharge time series for the downstream gauging stations. The HEC-ResSim reservoir operation model simulated reservoir outflow from eight major hydropower stations as well as the reconstructed streamflow for the main river branches Vu Gia and Thu Bon. Drought duration, severity, and frequency were analysed for different timescales for the naturalized and reconstructed streamflow by applying the daily varying threshold method.Efficiency statistics for both models show good results. A strong impact of reservoir operation on downstream discharge at the daily, monthly, seasonal, and annual scales was detected for four discharge stations relevant for downstream water allocation. We found a stronger hydrological drought risk for the Vu Gia river supplying water to the city of Da Nang and large irrigation systems especially in the dry season. We conclude that the calibrated model set-up provides a valuable tool to quantify the different origins of drought to support cross-sectorial water management and planning in a suitable way to be transferred to similar river basins.

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“…In previous studies [25,26], the influences of the TGD on the Yangtze River and lakes were usually explored in two stages: the period before the operation of the TGD from 1991 to 2002 and the period after the operation of the TGD in 2003. Thus, the observed daily water level data of Xingzi Station, a representative water level station in Poyang Lake, from 1991 to 2014 were used to analyze the variations of water level, daily discharge and water level of each hydrological station in the Yangtze River, Poyang Lake, and Dongting Lake catchments from 1991 to 2014 and daily inflow and outflow data of the TGD from 2003 to 2014 were used to simulate and analyze the influences of the TGD on the variation of the water level of Poyang Lake in this study.…”

Section: Datamentioning

confidence: 99%

Quantitative Assessment of the Influences of Three Gorges Dam on the Water Level of Poyang Lake, China

Wang

Zhang²,

Wang

et al. 2019

Water

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Lakes are important for global ecological balance and provide rich biological and social resources. However, lake systems are sensitive to climate change and anthropogenic activities. Poyang Lake is an important wetland in the middle reach of the Yangtze River, China and has a complicated interaction with the Yangtze River. In recent years, the water level of Poyang Lake was altered dramatically, in particular showing a significant downward trend after the operation of the Three Gorges Dam (TGD) in 2003, thus seriously affecting the lake wetland ecosystem. The operation of the TGD changed both the hydrological regime and the deeper channel in the middle reach of the Yangtze River, and affected the river–lake system between the Yangtze River and Poyang Lake. This study analyzed the change in the water level of Poyang Lake and quantified the contributions of the TGD operation, from the perspectives of water storage and erosion of the deeper channel in the middle reach of the Yangtze River, through hydrodynamic model simulation. The erosion of the deeper channel indicated a significant decrease in annual water level. However, due to the water storage of the TGD in September and October, the discharge in the Yangtze River sharply decreased and the water level of Poyang Lake was largely affected. Especially in late September, early October, and mid-October, the contributions of water storage of the TGD to the decline in the water level of Poyang Lake respectively reached 68.85%, 59.04%, and 54.88%, indicating that the water storage of the TGD was the main factor in the decrease in water level. The erosion of the deeper channel accelerated the decline of the water level of Poyang Lake and led to about 10% to 20% of the decline of water level in September and October. Due to the combined operation of the TGD and more reservoirs under construction in the upper TGD, the long-term and irreversible influence of the TGD on Poyang Lake should be further explored in the future.

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Flow regime of the three outlets on the south bank of Jingjiang River, China: an impact assessment of the Three Gorges Reservoir for 2003–2010

Cited by 20 publications

References 17 publications

Analysis of Long-Term Water Level Variation in Dongting Lake, China

Analysis of Long-Term Water Level Variation in Dongting Lake, China

Quantifying human impacts on hydrological drought using a combined modelling approach in a tropical river basin in central Vietnam

Quantitative Assessment of the Influences of Three Gorges Dam on the Water Level of Poyang Lake, China

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