Environmental flow requirements of fish in the lower reach of the Yellow River

2010 ◽  
Vol 35 (4) ◽  
pp. 381-396 ◽  
Author(s):  
Xiaohui Jiang ◽  
Angela Arthington ◽  
Liu Changming
Keyword(s):  
Yellow River ◽  
Environmental Flow ◽  
The Yellow River ◽  
Lower Reach

scholarly journals Limitations of Water Resources to Crop Water Requirement in the Irrigation Districts along the Lower Reach of the Yellow River in China

2019 ◽  
Vol 11 (17) ◽  
pp. 4680 ◽  
Author(s):  
Lei Liu ◽  
Jianqin Ma ◽  
Xiuping Hao ◽  
Qingyun Li
Keyword(s):  
Winter Wheat ◽  
Water Supply ◽  
Water Demand ◽  
Yellow River ◽  
Water Requirement ◽  
The Yellow River ◽  
Lower Reach ◽  
Crop Water ◽  
Irrigation Districts ◽  
The Impact

To analyze the water-resource limitations for crops in irrigation districts along the lower reach of the Yellow River, we used the single-crop coefficient method provided by FAO-56 to analyze crop water demand (CWD) and irrigation water requirement (IWR) for the main crops (winter wheat, summer maize, and cotton) from 1971 to 2015. The impact of climate threats on IWR was then quantified based on the standardized precipitation evapotranspiration index (SPEI), following which the conflicts between water demand and water supply were analyzed. The results show that about 75.4% of the total annual IWR volume is concentrated from March to June. Winter wheat is the largest water consumer; it used an average of 67.9% of the total IWR volume. The study area faced severe water scarcity, and severe water deficits occurred mainly between March and June, which is consistent with the occurrence of drought. With the runoff from the Yellow River Basin further decreasing in the future, the water supply is expected to become more limited. IWR is negatively correlated with the SPEI. Based on the relationship between SPEI and IWR, the water allocation for irrigation can be planned at different timescales to meet the CWD of different crops.

scholarly journals Long-Term Changes in Ice Phenology of the Yellow River in the Past Decades

2008 ◽  
Vol 21 (18) ◽  
pp. 4879-4886 ◽  
Author(s):  
Yundi Jiang ◽  
Wenjie Dong ◽  
Song Yang ◽  
Jun Ma
Keyword(s):  
Flow Rate ◽  
Yellow River ◽  
The Yellow River ◽  
Lower Reach ◽  
The Past ◽  
Ice Breakup ◽  
Breakup Date ◽  
Freeze Date ◽  
Freeze Duration ◽  
Ice Phenology

Abstract The authors quantitatively describe the changes in the characteristics of ice phenology including the flow rate and freeze/breakup dates of the Yellow River based on observations of the past 50 yr. In both the upper and lower reaches of the Yellow River, increasing temperature delays the freeze date and advances the breakup date, thus decreasing the number of freeze days and the expanse of river freeze. From 1968 to 2001, the freeze duration has shortened significantly by 38 days at Bayangaole and 25 days at Sanhuhe, respectively. From the early 1950s to the early 2000s, the changes in freeze and breakup dates have shortened the freeze duration in the lower reach of the Yellow River by 12 days. The flow rate has reduced from 500 to 260 m3 s−1, and the expanse of river freeze has also decreased significantly by about 310 km. In addition, in the lower reach of the river, the location of earliest ice breakup has shifted downstream significantly in the last 50 yr, although the location of earliest freeze exhibits little change.

scholarly journals Bayesian networks for environmental flow decision-making and an application in the Yellow River estuary, China

2014 ◽  
Vol 18 (5) ◽  
pp. 1641-1651 ◽  
Author(s):  
A. P. Pang ◽  
T. Sun
Keyword(s):  
Decision Making ◽  
Bayesian Networks ◽  
Water Use ◽  
Yellow River ◽  
River Estuary ◽  
Water Shortage ◽  
Environmental Flow ◽  
Water Diversion ◽  
The Yellow River ◽  
Production Loss

Abstract. We proposed an approach for environmental flow decision-making based on Bayesian networks considering seasonal water use conflicts between agriculture and ecosystems. Three steps were included in the approach: water shortage assessment after environmental flow allocation using a production-loss model considering temporal variations of river flows; trade-off analysis of water use outcomes by Bayesian networks; and environmental flow decision-making based on a risk assessment under different management strategies. An agricultural water shortage model and a production-loss model were integrated after satisfying environmental flows with temporal variability. The case study in the Yellow River estuary indicated that the average difference of acceptable economic loss for winter wheat irrigation stakeholders was 10% between water saving measures and water diversion projects. The combination of water diversion projects and water-saving measures would allow 4.1% more river inflow to be allocated to ecological needs in normal years without further economic losses in agriculture.

scholarly journals Bayesian networks for environmental flow decision making and an application in the Yellow River estuary, China

2013 ◽  
Vol 10 (12) ◽  
pp. 14873-14903 ◽  
Author(s):  
A. P. Pang ◽  
T. Sun
Keyword(s):  
Decision Making ◽  
Bayesian Networks ◽  
Water Use ◽  
Yellow River ◽  
River Estuary ◽  
Water Shortage ◽  
Environmental Flow ◽  
Water Diversion ◽  
The Yellow River ◽  
Production Loss

Abstract. We proposed an approach for environmental flow decision making based on Bayesian networks considering seasonal water use conflicts between agriculture and ecosystems. Three steps were included in the approach: water shortage assessment after environmental flow allocation using a production-loss model considering temporal variations of river flows; trade-off analysis of water use outcomes by Bayesian networks; and environmental flow decision making based on a risk assessment under different management strategies. An agricultural water shortage model and a production-loss model were integrated after satisfying environmental flows with temporal variability. The case study in the Yellow River estuary indicated that the average difference of acceptable economic loss for winter wheat irrigation stakeholders was 10% between water saving measures and water diversion projects. The combination of water diversion projects and water-saving measures would allow 4.1% more river inflow to be allocated to ecological needs in normal years without further economic losses in agriculture.

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