A performance evaluation method of monitoring systems for inner-basin drainage under imperfect observation
✍ Scribed by Naruhisa Tanaka; Hirokazu Tatano
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 251 KB
- Volume
- 14
- Category
- Article
- ISSN
- 0885-6087
No coin nor oath required. For personal study only.
✦ Synopsis
Major issues of urban drainage are coping with ¯ooding caused by torrential downpours and water pollution caused by washing loads from non-point sources. Large-scale trunk sewers and pumping stations are constructed in large Japanese cities. To reduce both types of damage due to ¯oods and water pollution, these sewerage systems should have additional functions of storage and treatment of the washing loads. In such a case, pump operations have a key role for the reduction of damage. However, perfect observation of the state of the system is dicult since continuous observation of water levels and/or water ¯ow in all the points of the sewers is necessary. Hence, we cannot use operation optimization techniques which require perfect observation of the system. In a certain condition, several stochastic optimization techniques only require partial state observations: systems equations and observation equations are both linear, the objective function is quadratic and the time-horizon of the problem is ®nite. Although there may be cases where these assumptions hold, it is hard to obtain an optimal operation policy of pumping stations in urban inner-drainage systems using these optimization techniques, since observation equations, at least, are non-linear in most situations. This paper focuses on this partial observability of states for pump operation problems in sewerage systems. A practical method to design pump operation optimization and an evaluation method of the performance on the reduction of damage by implementing another monitoring station to the system are introduced. A numerical example is also presented to illustrate how the proposed method works.