前池雨水花园系统径流水量控制性能试验研究

针对现有城市工业区建筑物屋面雨水径流的特点,在原有雨水花园基础上增设蓄存功能,提出了一种前池雨水花园系统,并模拟了降雨量下(降雨条件为重现期0.5、1、2年,降雨历时为30、60、120 min)的径流水量控制试验。结果表明,前池雨水花园系统对径流的削减可达到1/2以上,甚至可全部削减,且蓄水高度、各部分水量分配及流量曲线等均与重现期和降雨历时相关。与常规雨水花园系统进行对比试验发现,前池雨水花园系统的径流总量削减率更高,且其溢流时间点和出流时间点均延迟约34 min,而溢流峰值与出流持续时间却分别缩短了24、40 min。因此,在雨水花园系统中增设前池能显著提高其对雨水的管控能力。

Assessment of Saline Water Intrusion into Huong River in Dry Season

Most rivers in Vietnam flow directly to the sea where the interaction between fresh and salt water occurs. Because of uneven flow distribution through the year with only 20% annual flow in the dry season, while fresh water requirement for socio-economic activity in this season is much higher. With this situation, the simulation and finding out the mechanism of saline water intrusion into the estuary in general will help to suggest suitable solutions to control the situation. This paper presents results done at the Huong river estuary. Based on the data collected in current years and using MIKE11 softwave, number scenarios were simulated and found out the intruded process of saline water into the river. They will be very important parameters for which solutions to control negative effects to serve socio-economic development at the downstream of Huong river will be recommended and implemented in the later stage.