KU Leuven, Hydraulics Laboratory, Kasteelpark Arenberg 40, box 2448, B-3001 Leuven, Belgium.
Water Sci Technol. 2013;67(12):2670-6. doi: 10.2166/wst.2013.147.
The impact of urban water fluxes on the river system outflow of the Grote Nete catchment (Belgium) was studied. First the impact of the Waste Water Treatment Plant (WWTP) and the Combined Sewer Overflow (CSO) outflows on the river system for the current climatic conditions was determined by simulating the urban fluxes as point sources in a detailed, hydrodynamic river model. Comparison was made of the simulation results on peak flow extremes with and without the urban point sources. In a second step, the impact of climate change scenarios on the urban fluxes and the consequent impacts on the river flow extremes were studied. It is shown that the change in the 10-year return period hourly peak flow discharge due to climate change (-14% to +45%) was in the same order of magnitude as the change due to the urban fluxes (+5%) in current climate conditions. Different climate change scenarios do not change the impact of the urban fluxes much except for the climate scenario that involves a strong increase in rainfall extremes in summer. This scenario leads to a strong increase of the impact of the urban fluxes on the river system.
研究了城市水通量对大网特流域（比利时）水系出口的影响。首先，通过将城市通量模拟为详细的水动力河模型中的点源，确定了当前气候条件下污水处理厂（WWTP）和合流污水溢流（CSO）排放对河系的影响。比较了有无城市点源时的模拟结果在峰值流量极值方面的差异。在第二步中，研究了气候变化情景对城市通量的影响以及对河流流量极值的相应影响。结果表明，由于气候变化，十年一遇的小时峰值流量排放的变化（-14%至+45%）与当前气候条件下由于城市通量引起的变化（+5%）处于同一数量级。不同的气候变化情景对城市通量的影响变化不大，除了涉及夏季极端降雨强烈增加的气候情景外。这种情况会导致城市通量对水系的影响大大增加。
