Study And Application Of The Huangpu River Accidental Oil Spill Simulation Model

Huangpu River is the so-called golden transportation waterway in Shanghai, and provides Shanghai with over 80% of the source drinking water to the resident. The materials transported on Huangpu River include a great amount of chemicals such as oil and hazardous chemicals. The source drinking water could be in danger when accidental chemical spills occur in the river.Delft3D-PART modeling system is used for the Huangpu River accidental oil spill modeling study. In-situ measurements of flow, water level and flume study results of oil spills are used for the model calibration and verification. The main parameters calibrated in the model are dispersion coefficient(a=0.07, b=0.7), roughness length(0.02m), wind drag coefficient(Cwd=3%), and evaporation rate(0.1/d). The modeling result is in good coincide with both the lab findings and the in-situ measurements.The modeling study of oil spill shows that if 1 ton oil spill release occurred anywhere upsteam of the water intake on Huangpu River in Shanghai, the intake will be covered with spills. If oil spill of 1 ton is released within 5.5km downstream of the water intake, the oil spill will cover the intake in less than 24 hours. If oil spill of 100 tons is released within 8km downstream of the intake, the intake will be affected in 1 day, and if oil spill of 200 tons is released within 10km downstream of the intake, the intake will also be polluted by oil in less than 1 day. With consideration of source water protection, the reach upstream and the reach 10 km downstream is the most dangerous and thus most important water area. Oil spills in this range of river should be avoided to the best of management measures. Once an oil spill happens, it should be disposed of as immediately as possible to reduce its damage.Huangpu River is a tidal influenced river, the transportation and dispersion of spilled oil show a different pattern. Spilled oil moves upstream and down stream following the tide in the river, and in consideration of the intake protection, HuangpuRiver could be divided into three reaches as follows: upsteam reach, from Mishidu to Wujing, middle reach, from Wujing to Suzhou Creek, and downstream reach, from Suzhou Creek to Wusongkou. From upstream to downstream, spilled oil is more and more obviously affected by tide. The most obvious characteristic is that the duration of up and down stream movement is shorter and shorter from upstream to downstream. The first change of direction at the three reaches happens 6 hours, 4 hours, and 2 hours after the spill respectively. And the times of reciprocator in downstream reach are much more than upstream reach.