Study On The Rational Allocation Of Water Resources Of Han-to-Wei Water Diversion Project Of Shaanxi Province By Considering Local Water

Guanzhong area is the heart of economic and social development of Shaanxi Province,also a key national economic development area.In recent years,the most important constraints affecting the economic and social development of Guanzhong area is water shortage.One of the important measures to alleviate water shortages in the Guanzhong area is Han-to-Wei water diversion project of Shaanxi province.The water resources planning of the project includes two parts,one is the reservoir optimal scheduling of diversion area;the other is the rational allocation of water resources in the water receiving area.This study focuses on the integration of water quality and quantity configuration of the water receiving area.The water receiving area water al ocation study is divided into two scenarios: 2020 target year Han-to-Wei diversion 1 billion m3,direct water objects are five major cities,such as Xi’an,11 county-level cities,such as Zhouzhi;2030 target year Han to the Wei diversion 1.5 billion m3,direct water objects are five major cities,11 county-level cities and 6 industrial parks.According to geographical location and water relations of the water object,the water receiving area is divided into five patches and build water supply network.Source software is developed by the Australian Research Centre eWater,it can achieve water al ocation,reservoir operation,agricultural irrigation,water pollution control,wetland protection and management of water ownership and other hydrologic simulation modeling tools.Model function used in this study is the al ocation of water resources and water pollution control,is calculated by the network linear programming(NetLP)method based on PPRN linear programming algorithm,using cost function to calculate the optimal solution.Model targets to shortage of water to minimize,maximize eco-environmental water demand satisfaction,and minimize the amount of deviation indicator of water quality and water quality objectives.Establishment of the river water model,constraints overall water balance,water balance out of storage reservoirs,river section flow constraints,reservoir storage and discharge capacity,groundwater mining capacity and variable non-negative.Establishment of river water quality model,COD,NH3-N is the analog indicators,constituents attenuation algorithm is the half-life models.The basic model calibration coefficient is the discharge coefficient and the attenuation coefficient of pollutants.Model inputs include river confluence,reservoir inflow,storage capacity curve,reservoirs discharged capacity,measured flow of hydrological stations,2020/2030 target year of users’ demand forecasting,water quality indicators measured concentration data.Evaluation of the model calibration and validation using data correlation coefficient R,Mash-Sutcliff coefficient Ens,relative error coefficient RE and standard deviation SD,inspection and evaluation of the model Fitting degree of the analog value and the measured values.Effective coupling model of water quality and quantity,after repeated solving calculations developed various patches users of the water receiving area water al ocation plan and individual users pollutant emission control program to provide a reference for the al ocation of water resources of the water receiving area of Han-to-Wei and the control of water pollution in Guanzhong area.