太湖“二引三排”调水新格局是保障湖区水生态安全的重要方式,但其对太湖水生态功能的改善效果如何仍少有报道。以太湖为研究区域,模拟研究了新增新孟河调水在不同情境下对太湖湖区水龄、水质和水生态等水生态功能的影响。结果显示,太...太湖“二引三排”调水新格局是保障湖区水生态安全的重要方式,但其对太湖水生态功能的改善效果如何仍少有报道。以太湖为研究区域,模拟研究了新增新孟河调水在不同情境下对太湖湖区水龄、水质和水生态等水生态功能的影响。结果显示,太湖水龄和叶绿素a (Chl-a)的浓度随调水流量的增加而降低,水龄降低了6.2%~9.0%,Chl-a下降了13.5%~21.5%,调水对两者具有明显的缓解效果。然而,调水流量的增加也引起了湖区总氮总磷的显著增加,现状水质下分别升高了1.2%~9.9%和6.3%~13.8%,但水质优化后,两者分别下降了3.7%~6.2%和6.3%~8.8%。因此,新孟河现状调水需要综合考虑水量和水质因素,入湖水质提升可以有效提升太湖的水生态功能,研究结果可为太湖流域水安全保障提供科学依据和技术支撑。The new pattern of water diversion in the Taihu Lake, known as “two diversions and three drainage”, is an important way to ensure the water ecological safety. However, the effect of the new water diversion on the improvement of the water ecological functions in Taihu Lake is rarely reported. This study simulated the impact of the Xinmenghe water diversion on the water age, water quality, and water ecology of the Taihu Lake under different scenarios. The results show that the water age and Chlorophyll a (Chl-a) concentration in the lake decrease as the diversion flow increases, with the water age decreasing by 6.2%~9.0% and Chl-a decreasing by 13.5%~21.5%, showing significant mitigation effects on the water age and Chl-a. However, the increased flow with the current water quality significantly increased the total nitrogen and total phosphorus in the lake, with an increase of 1.2%~9.9% and 6.3%~13.8%, respectively. After optimizing the water quality, the total nitrogen and total phosphorus decreased by 3.7%~6.2% and 6.3%~8.8%, respectively. Therefore, both water quantity and water quality should be comprehensively considered in terms of Xinmenghe diversion. The improved water quality of inflow from Xinmenghe diversion can effectively enhance the ecological functions of the Taihu Lake. These results could provide scientific basis and technical support for the water security protection of Taihu Lake.展开更多
虚拟管道宽度直接影响了管道内无人机的流速,但目前虚拟管道规划的方法并不能保证管道宽度,容易造成堵塞,严重影响无人机通行效率。对此,提出一种虚拟管道空间满足规划方法,可以在包含障碍物的环境中得到一条满足虚拟管道空间要求的管...虚拟管道宽度直接影响了管道内无人机的流速,但目前虚拟管道规划的方法并不能保证管道宽度,容易造成堵塞,严重影响无人机通行效率。对此,提出一种虚拟管道空间满足规划方法,可以在包含障碍物的环境中得到一条满足虚拟管道空间要求的管道生成线。主要包括路径搜索和轨迹优化,基于快速探索随机树*(rapidly exploring random tree*,RRT*)搜索,通过空间检测判断每段路径周围是否有足够空间,若无足够空间则重新拓展搜索,替换掉空间不足的路径段。在轨迹优化过程中,使用均匀B样条参数化轨迹,并设计碰撞代价函数和光滑代价函数,使轨迹远离障碍物,为虚拟管道规划提供足够空间。仿真测试验证了所提方法在大规模集群中的优越性和鲁棒性。在仿真测试中,15架无人机集群通行时间平均降低20%。展开更多
文摘太湖“二引三排”调水新格局是保障湖区水生态安全的重要方式,但其对太湖水生态功能的改善效果如何仍少有报道。以太湖为研究区域,模拟研究了新增新孟河调水在不同情境下对太湖湖区水龄、水质和水生态等水生态功能的影响。结果显示,太湖水龄和叶绿素a (Chl-a)的浓度随调水流量的增加而降低,水龄降低了6.2%~9.0%,Chl-a下降了13.5%~21.5%,调水对两者具有明显的缓解效果。然而,调水流量的增加也引起了湖区总氮总磷的显著增加,现状水质下分别升高了1.2%~9.9%和6.3%~13.8%,但水质优化后,两者分别下降了3.7%~6.2%和6.3%~8.8%。因此,新孟河现状调水需要综合考虑水量和水质因素,入湖水质提升可以有效提升太湖的水生态功能,研究结果可为太湖流域水安全保障提供科学依据和技术支撑。The new pattern of water diversion in the Taihu Lake, known as “two diversions and three drainage”, is an important way to ensure the water ecological safety. However, the effect of the new water diversion on the improvement of the water ecological functions in Taihu Lake is rarely reported. This study simulated the impact of the Xinmenghe water diversion on the water age, water quality, and water ecology of the Taihu Lake under different scenarios. The results show that the water age and Chlorophyll a (Chl-a) concentration in the lake decrease as the diversion flow increases, with the water age decreasing by 6.2%~9.0% and Chl-a decreasing by 13.5%~21.5%, showing significant mitigation effects on the water age and Chl-a. However, the increased flow with the current water quality significantly increased the total nitrogen and total phosphorus in the lake, with an increase of 1.2%~9.9% and 6.3%~13.8%, respectively. After optimizing the water quality, the total nitrogen and total phosphorus decreased by 3.7%~6.2% and 6.3%~8.8%, respectively. Therefore, both water quantity and water quality should be comprehensively considered in terms of Xinmenghe diversion. The improved water quality of inflow from Xinmenghe diversion can effectively enhance the ecological functions of the Taihu Lake. These results could provide scientific basis and technical support for the water security protection of Taihu Lake.
文摘虚拟管道宽度直接影响了管道内无人机的流速,但目前虚拟管道规划的方法并不能保证管道宽度,容易造成堵塞,严重影响无人机通行效率。对此,提出一种虚拟管道空间满足规划方法,可以在包含障碍物的环境中得到一条满足虚拟管道空间要求的管道生成线。主要包括路径搜索和轨迹优化,基于快速探索随机树*(rapidly exploring random tree*,RRT*)搜索,通过空间检测判断每段路径周围是否有足够空间,若无足够空间则重新拓展搜索,替换掉空间不足的路径段。在轨迹优化过程中,使用均匀B样条参数化轨迹,并设计碰撞代价函数和光滑代价函数,使轨迹远离障碍物,为虚拟管道规划提供足够空间。仿真测试验证了所提方法在大规模集群中的优越性和鲁棒性。在仿真测试中,15架无人机集群通行时间平均降低20%。
