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1、The Environmental Education and Conservation Project in Bang Sue, Bangkok (MIKE URBAN Modelling and Analyses) Krieattisak Sriaram1*, Sunti Srithongsom1, Berislav Tomicic2, Ole Mark2 1 Panya Consultants Co., Ltd, office at 22 Latphrao 35, Chandrakasem, Chatuchak, Bangkok 10900, THAILAND 2DHI Water an
2、d Environment Agern All 5, DK-2970 Hrsholm, Denmark *Corresponding author, e-mail: krieattisak_spanyaconsult.co.th As a part of feasibility study for the Environmental Education and Conservation Project in Bang Sue, Bangkok Panya Consultants and DHI have developed a hydrological, hydrodynamic and wa
3、ter quality model for the wastewater and storm water drainage system in the Bang Sue project area. The models were developed inside the framework of MIKE URBAN modelling platform for urban water systems. MIKE URBAN is a GIS-based software tool, compatible with major GIS software (ArcGIS). Based on t
4、he system configuration data available for the present configuration and the design data for the future, the models were developed in three different alternatives: 1. Present configuration (2005) 2. Future configuration (2009 - 2034) with interceptor along the Ratchadaphisek Road, WWTP plant in the
5、Chatuchak park and effluent disposal pipeline into the Khlong Premprachakorn. Alternative 1. 3. Future configuration (2009 - 2034) with interceptor along the Khlong Bangkhen, WWTP plant in the Chatuchak park and effluent disposal pipeline into the Khlong Premprachakorn. Alternative 2. The models hav
6、e been used for the simulations of the system behaviour in all three alternative configurations, under different loading and operational scenarios. The dynamic simulations included dry weather operations and wet weather operations under historical rainfalls and wet weather operations under extreme s
7、ynthetic rainfalls, featuring both the hydrodynamic and water quality processes. On the basis of the simulations carried out, the following conclusions are drawn: 1. Operation of the sewer network in dry weather: The drainage network has been analysed with a hydrodynamic model taking into the accoun
8、t the dynamic routing of the waster water flow together with the routing of the daily dry weather flow peaks. Both under the present DWF load (year 2005) and under increased DWF in the period up to 2034, the drainage network is and will be capable of collecting and transporting the wastewater genera
9、ted in the area. This conclusion is valid for the main drains included in the model, i.e. not including local drainage conditions on micro-scale. 2. Operation of the sewer network and the Khlong system in wet weather under extreme loading conditions: The hydrodynamic simulations have shown, in accor
10、dance with historical records, that the system is subject to risk of local flooding as a consequence of intensive rainstorms. With data available for the model developed it was not possible accurately to localise and quantify the flooding risk exactly according to the historical records. However, it
11、 is clear that the processes like continued impermeabilisation, deterioration of the pipe network, land settlement etc. will contribute to a further increase of the flooding risk, unless counteracted by substantial and continuous rehabilitation of the pipe network. When data becomes available then t
12、he model can be verified to a higher extent and it can be applied for simulation of rainfall and flood events with different return periods. 3. Operation of the designed interceptor during dry weather: For both alternatives, the designed interceptor is capable of intercepting approx. 96-98% of the d
13、ry weather loads. The hydraulic conditions under the minimum load according to the Thailand design criteria (velocity at 1.5 * DWF at the first year 2009 - after commissioning) remain almost inside the design criteria, where the minimum velocity for the combined sewer is based on pipe diameter: less
14、 than 600mm = 0.8 m/s; 600mm-1200mm = 0.7m/s and greater than 1200mm = 0.6m/s. 4. Operations of the designed interceptor in wet weather: The simulations in both alternatives have demonstrated that even under the extreme storm load, maximum pressure grade line would not rise to the level which would
15、cause surcharge of water from the interceptor on the surface. This is because the pressure grade line is in normal operation controlled and held relatively low by the WWTP pumping station. With the pumping station at WWTP shut down, the pressure grade line would be controlled by the water levels in
16、the CSO structures. 5. Operation of the pumping station at WWTP: This pumping station will under normal conditions operate under varying pumping heads high heads during DWF, and low head during wet weather. This means two distinct pumping regimes, requiring adequately adaptable pumping machinery. 6. Impact of the interceptor on drainage capacity of the system: The simulations have confirmed that the construction of the interceptor does
