Changes in the plain river system and its hydrological characteristics under urbanization – case study of Suzhou City,China     

Zhixin Lin  Xiaoying Dai  Qiang Wang  Bin Gao  Jie Xiang 《水文科学杂志》2019,64(16):2068-2079

ABSTRACT

Rapid urbanization in China has severely disturbed the underlying surface and river systems. The stream structure parameters of Suzhou City were analysed to study the evolution and spatial differentiation of a water system undergoing urbanization. The influencing pattern of different urbanization processes on river system structure and hydrological processes was detected by statistical methods and simulation analysis. The results show that urban sprawl is influenced by both the natural environment and the social economy. At different stages of urbanization, the spatial urban expansion and the natural river characteristics influence the evolution of the river network: during rapid urbanization, the decline in surface water ratio and river density is more intense. The decrease of surface water ratio and river density in rapidly urbanized areas was greatest, followed by that in area urbanized in the 1980s, with few changes in the old town. Under high urbanization, river system indicators tend to stabilize. The rivers’ hydrological features were affected by urbanization, with water yield in the study area increasing from 0.81 to 0.95 m³/m² (1991–2015). The same rainfall intensity results in higher flood levels and greater risk of flooding under rapid urbanization.  相似文献   

城镇化下河流水质变化及其与景观格局关系分析——以太湖流域苏州市为例   总被引：3，自引：0，他引：3  

杨洁  许有鹏  高斌  王跃峰  徐羽  马倩 《湖泊科学》2017,29(4):827-835

以河流近域景观格局与水环境质量间的关系为研究对象,基于2001年及2010年两期土地利用类型以及7条典型河流的溶解氧、氨氮、高锰酸盐指数、总磷、总氮5项水质指标,分析城镇化下苏州市河流水质与景观格局之间的关系及其变化规律.结果表明:(1)苏州市河流水质状况总体较差,但呈现一定的好转趋势.(2)河流水质受到城镇用地、旱地及水田的综合影响,并表现出尺度效应.其中城镇用地与旱地对河流水质恶化具有明显的作用,水田则反之.2001-2010年城镇用地及水田对水质的影响程度有所减弱,旱地则增强.(3)蔓延度指数、最大面积斑块比例对河流水质呈现负相关,斑块数量、斑块密度、香农均匀度指数、香农多样性指数则与水质呈现正相关.景观格局对于水质的影响在大范围缓冲区更为显著.研究结果可为苏州水环境管理及太湖流域城市空间开发提供一定的参考依据.  相似文献   

Analyzing space-time evolution of rural transition in a rapidly urbanizing region: A case study of Suzhou,China   总被引：1，自引：1，他引：0  

Zhang  Ruoyan  Li  Hongbo  Yuan  Yuan 《地理学报(英文版)》2022,32(7):1343-1356

Journal of Geographical Sciences - Influenced by globalization, rural transition in developed Western countries has experienced processes of productivism, post-productivism, and multifunctional...  相似文献   

A siltation simulation and desiltation measurement study downstream of the Suzhou Creek Sluice,China     

季永兴  杨绯  张汉云  卢永金 《中国海洋工程》2013,27(6):781-793

The Suzhou Creek Sluice is currently the largest underwater plain gate in the world, with a single span of 100 m. It is located in a tidal estuary at the junction of the Huangpu River and Suzhou Creek in Shanghai, China. In this study, physical and 2D vertical mathematical models were used to investigate and distinguish the mechanism of siltation downstream of an underwater plain gate from that of other gates types. According to quantitative data obtained by site investigation and the application of the physical hydrodynamic models, it was found that the characteristics of the tidal estuary as well as the fact that the sluice span is equal to the creek width are the major reasons contributing to siltation. A possible desiltation treatment system is proposed for the underwater plain gate. The system includes selection of a suitable location that allows the determination of a reasonable top elevation of the sluice floor, reserving sufficient space under the gate to accommodate siltation, setting up a mechanical desiltation system, and flushing silt along with overflow over the top of the gate. Furthermore, on-site hydraulic silt flushing experiments and a topography survey were conducted. These results showed that the measurement system is effective, and by maintaining this scheduled operation once a month, the downstream riverbed has been maintained in a good condition.  相似文献   

建设"数字苏州"应该解决的关键问题     

汪祖民  张本东 《测绘与空间地理信息》2005,28(4):50-52

通过对“数字苏州”建设方案和最近几项信息化工程建设实践进行分析，提出了5个方面亟待解决的问题，并得出了基本结论。  相似文献   

从随州陨石研究探讨地幔的高压矿物组成     

谢先德  陈鸣 《矿物岩石地球化学通报》2005,24(4):277-285

随州陨石母体在30 Ma前遭遇一次其他星体的撞击后,矿物发生了冲击变质作用,产生了几条宽度仅为0.02～0.09 mm的冲击熔脉.我们在随州陨石熔脉内和熔脉边部先后发现了多种冲击成因的高压相矿物,如粗粒的、由固态相变形成的林伍德石、低钙辉石的镁铁榴石相、钛铁矿相和钙钛矿玻璃相、NaAlSi3O8-锰钡矿相、涂氏磷钙石和铬铁矿的两种后尖晶石高压多形—CaFe2O4结构相和CaTi2O4结构相（其中后三种为首次发现的高压相新矿物）,以及细粒的、在高压下从硅酸盐熔体结晶的镁铁榴石-镁铝榴石固溶体、镁方铁矿和林伍德石微晶集合体.此外,在陨石主体中还见有斜长石的高压熔体相—熔长石.熔长石和多种高压相矿物的存在,限定了随州陨石主体所受压力、温度分别为20 GPa和1100℃,熔脉内则高达23～25 GPa和2000～2300℃.上述撞击产生的压力与地球内部地幔转换带下部到下地幔顶部的压力相当.大量天然产出的高压相矿物在随州陨石中的发现,对了解深部地幔的矿物组成和元素地球化学行为具有重要理论意义.  相似文献   

异质性“通道”与跨国公司地方化结网——以苏州工业园为例     

艾少伟  苗长虹 《地理研究》2011,30(8):1483-1498

在经济全球化时代,跨国公司是开发区形成、发展和演进的关键驱动力量。在多种异质性行为主体交互作用所形成的＂学习场＂中,跨国公司要实现其全球化和本土化战略,就必须与开发区政府和本土企业之间建立有效的地方化结网＂通道＂。其中,＂政策通道＂首先为其提供了最基本的＂通道＂保障,成为跨国公司进驻开发区的初始动因。通过技术、市场等各...  相似文献   

Urban land evolution in Suzhou area: From early 1980S to middle 1990S     

王红扬 《中国地理科学(英文版)》1999,9(4):350-357

Ｕｒｂａｎｌａｎｄｉｓｔｈｅｍａｉｎｃａｒｒｉｅｒｏｆｈｕｍａｎｄｅｖｅｌｏｐｍｅｎｔ．Ａｔｔｈｅｓａｍｅｔｉｍｅｌａｎｄｉｓａｂａｓｉｃｍｅａｎｓｏｆｐｒｏｄｕｃｔｉｖｉｔｙ．Ｕｒｂａｎｌａｎｄｅｖｏｌｕｔｉｏｎｓｅｎｓｉｔｉｖｅｌｙｒｅｆｌｅｃｔｓｔｈｅｐｒｏｃｅｓｓ,ｔｅｎｄｅｎｃｙａｎｄｃｏｎｔｒａｄｉｃｔｉｏｎｏｆｄｅｖｅｌｏｐｍｅｎｔ．Ｔｈｉｓｐａｐｅｒｆｉｒｓｔｔｈｅｏｒｉｚｅｓｔｈｅｇｅｎｅｒａｌｉｎｔｅｒｐｒｅｔａｔｉｏｎｏｎｕｒｂａｎｌａｎｄｅｖｏｌｕｔｉｏｎ．Ｔｈｅ…  相似文献   

苏州西南部的推覆和伸展构造   总被引：2，自引：0，他引：2  

蔡东升  施央申 《大地构造与成矿学》1993,17(2):163-178

根据大量的地质、钻孔资料,结合地球物理资料和岩组分析研究,发现苏州西南部中生代以来至少经历了两期重要的构造变动:先期的推覆、后期的伸展。推覆时代确定在早、中三叠世之后,晚侏罗世之前。其后该区便转入伸展构造发育期。推覆构造具有台阶状逆断层及其相关褶皱组合的几何学特征。推覆动向大体从北西(340°±)向南东,并有左旋逆冲性质。根据平衡剖面恢复,确定最小推覆缩短量为18—20公里,缩短率为45.6—47.6％。伸展拉张为表层的重力滑动,浅层形成NNE走向为主的“堑—垒”式对称正断层体系。区域盆地构造走向,野外地质和岩组的研究表明拉张主方向大体为NW305°—SE115°,并具右旋运动性质。挤压和拉张、推覆和伸展的叠加改造,使得苏州西南部的地层,包括大部分岩体在内,均成为无根构造岩片的叠置。这对研究该区高岭土和多金属矿床的成矿机理和指导找矿有重要意义。  相似文献   

苏州高岭土矿成矿期后的矿物演化及其与矿体改造的关系          下载免费PDF全文

周国平 《岩石矿物学杂志》1988,7(2):158-166

苏州高岭土矿主要由高岭石、7埃洛石、10埃洛石及少量绢云母、蒙脱石、明矾石、三水铝石组成。高岭土矿物形成后因外界地化条件改变发生了以下转变:(1)埃洛石脱水向高岭石转化;(2)次生淋滤埃洛石形成;(3)埃洛石和三水铝石之间的互相转化;(4)Ca型蒙脱石形成;(5)高岭土的磷酸盐化作用;(6)次生淋滤明矾石的形成。矿物生成的先后顺序和共生关系可将矿物形成分为主要成矿期和成矿期后演化两个阶段。矿物的后期演化使优质高岭土进一步富集,改造,形成量大质优的高岭土矿。同时,非高岭土矿物的生成又使部分矿石质量变差,降低了矿石的工业价值。  相似文献