Ecological risk assessment based on IHA-RVA in the lower Xiaolangdi reservoir under changed hydrological situation

1st International Global on Renewable Energy and Development

Bai, Tao^1 ; Ma, Pan-Pan^1 ; Kan, Yan-Bin^2 ; Huang, Qiang^1

State Key Laboratory Base of Eco-Hydraulic Engineering in Arid Area, Xi'An University of Technology, Jinhua Road 5, Xi'an, Shaan xi

710048, China^1

Langfang Hydrology Bureau of Hebei Province, Xinhua Road 90, Langfang, Hebei

065000, China^2

关键词: Downstream of Yellow rivers;    Ecological environments;    Ecological risk assessment;    Fuzzy comprehensive evaluation;    Hydrologic alterations;    Hydrological regime;    Range of variability approaches;    Xiaolangdi reservoir;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/100/1/012214/pdf
DOI  :  10.1088/1755-1315/100/1/012214

来源: IOP

【 摘 要 】

Ecological risk assessment of river is an important content for protection and improvement of ecological environment. In this paper, taking Xiaolangdi reservoir for example, ecological risk assessments are studied based on the 1956-1997 and 2002-2008 dairy runoff data as the pre and post of construction of Xiaolangdi reservoir. Considering pre and post hydrological regime of construction of Xiaolangdi, ecological risk assessment index systems of downstream are established based on Index of Hydrologic Alteration-Range of Variability Approach method (IHA-RVA), which considering characters of flow, time, frequency, delay and change rate. Then ecological risk fuzzy comprehensive evaluation assessment model downstream is established based on risk index and RVA method. The results show that after the construction of Xiaolangdi reservoir, ecological risk occurred in the downstream of Yellow River for changed hydrological indexes, such as monthly average flow, frequency and duration of extreme annual flow and so on, which probably destroy the whole ecosystems of the river. For example, ecological risk downstream of Xiaolangdi reservoir upgrade to level two in 2008. Research results make reference values and scientific basis both in ecological risk assessment and management of reservoir after construction.