Study On The Sustainable Utilization Of Water Resources In Laoshan District, Qingdao City

Sustainable use of water resources is a new process under the framework of sustainable development, which can guarantee the sustainable development of society, economy and ecological environment. Also it can settle the crisis of water resources.Therefore, the research on sustainable use of water resources has important theoretical and practical value.Based on the analysis of Laoshan District, the research was carried on including water environment capacity, water allocation and forewarning evaluation. Hydraulics, System Dynamics(SD) and analytic hierarchy process(APH) are applied in the research. The main contents and conclusions are as following:1. With economic development, urbanization and continuous improvement of people's living standards, the demand of water resources in Laoshan District will continue to increase dramatically. It's difficult to exploit the new water resources locally and import external water resources because of uneven temporal and spatial distribution. As the fundamental solution to settle the crisis of water resources, the optimized allocation and management of water resources is imperative.2. Water environmental capacity (WEC) model was set up combined with the characteristics of the river in Laoshan District. And the correlation between velocity and flow, attenuation coefficient and velocity according to the water quality and hydrology tested data of close water body. The WEC of Laoshan District was calculated regarding CODMn and Ammonia-N as the control parameters. When the Guarantee Rate is 50%,the WEC for CODMn and Ammonia-N is 2595.69t/a and 27.50t/a respectively. When the Guarantee Rate is 75%,the WEC for CODMn and Ammonia-N is 1497.33t/a and11.62t/a. When the Guarantee Rate is 90%,the WEC for CODMn and Ammonia-N is 819.84t/a and 5.33t/a. The results of WEC is very important to the water optimized allocation.3. The software VENSIM is applied to set up the water allocation model for Laoshan District according to the basic theory of water allocation. The objective of this model is to insure the sustainable development. And the limitations are water environmental capacity and water resources capacity. The simulation results show that the available water amount is 55.70, 81.92 and 121.39 million ton in the year of 2010,2020 and 2030 respectively. And the amount of water demand is 44.91, 73.43 and 125.93 million ton respectively. The water resources capacity is 0.81, 0.90 and 0.97. The discharge of CODMn is 691.84,931.85 and 889.14 ton respectively. And the water environmental capacity is 0.46, 0.62 and 0.59 respectively. The supply of water resources can meet the demand for development in the mass.4. Sustainable development includes"development","sustainability"and"coordination". Therefor the multi-objective evaluation method was set up to assess the water complex system. The results show that the value of Laoshan Distrct is not high because of the dramatic increase and imbalance incurred by the development of economic. In the long run, the sustainability of water resources will restrict the development of Laoshan District. So the sustainability of sub-system in the water compound system should be improved.