As a new urban development pattern, the construction of sponge cities has been deeply integrated into the new urbanization and water safety strategy. Nanning City, as one of the first batch of experimental sponge citi...As a new urban development pattern, the construction of sponge cities has been deeply integrated into the new urbanization and water safety strategy. Nanning City, as one of the first batch of experimental sponge cities in China, has undertaken exploration and practice on sponge city planning, construction, and management. The sponge city master plan of Nanning City establishes an urban ecological spatial pattern in order to protect the security of the sponge base. The sponge city construction strategy has also proposed an overall construction strategy of a sponge city in line with urban development features. Through the systematic analysis and planning, a "23+10+202" pattern of sponge city construction has been formed. "23" represents 23 drainage basins, in which major sponge facilities such as storage facilities, waterfront buffer zones, wetland parks, ecological rainwater corridor and sponge parks are allocated. "10" represents 10 sponge functional zones, which provide important reference for the establishment of sponge city construction index system. "202" represents 202 management units, which decomposes the general objective and provides technical support not only for sponge city construction and management, but also for the implementation of general objectives in the regulatory plan as well.展开更多
文摘探地雷达(Ground Penetrating Radar,GPR)正演模拟是解译和反演实测GPR数据的基础。然而,使用传统时域有限差分方法(Finite Difference Time Domain,FDTD)实现GPR正演模拟时,时间步长受到Courant Friedrichs Lewy(CFL)条件严格限制,存在运算耗时较长的问题,为此,提出使用局部一维隐式时域有限差分方法(Locally One Dimension Finite Difference Time Domain,LOD-FDTD)实现二维GPR正演模拟。LOD-FDTD使用Crank-Nicolson方法从FDTD中推导得到,该方法的时间步长不受CFL条件限制,能够使用大时间步快速完成GPR正演模拟。对均质模型以及含多层界面和多个地质体的复杂地质模型进行GPR正演模拟实验,结果表明,在占用内存空间小于120MB的情况下,LOD-FDTD方法能够使用FDTD最大时间步长2倍以上的时间步长,有效地计算雷达波在地下空间的传播过程,并获得不同地质体的GPR响应信号,证明了本文方法具有占用内存适中、运算速度快、求解精度好等优点,较传统FDTD能够快速、高效地实现GPR正演模拟。
文摘As a new urban development pattern, the construction of sponge cities has been deeply integrated into the new urbanization and water safety strategy. Nanning City, as one of the first batch of experimental sponge cities in China, has undertaken exploration and practice on sponge city planning, construction, and management. The sponge city master plan of Nanning City establishes an urban ecological spatial pattern in order to protect the security of the sponge base. The sponge city construction strategy has also proposed an overall construction strategy of a sponge city in line with urban development features. Through the systematic analysis and planning, a "23+10+202" pattern of sponge city construction has been formed. "23" represents 23 drainage basins, in which major sponge facilities such as storage facilities, waterfront buffer zones, wetland parks, ecological rainwater corridor and sponge parks are allocated. "10" represents 10 sponge functional zones, which provide important reference for the establishment of sponge city construction index system. "202" represents 202 management units, which decomposes the general objective and provides technical support not only for sponge city construction and management, but also for the implementation of general objectives in the regulatory plan as well.
