Effect of digital elevation model spatial resolution on depression storage     

Jingming Hou  Xinyi Li  Zhanpeng Pan  Junhui Wang  Ruike Wang 《水文研究》2021,35(10):e14381

Surface water storage—including wetlands and other small waterbodies—has largely been disregarded in traditional hydrological models. In this paper, the grid resampling method is adopted to study the influence of the digital elevation model (DEM) grid resolution on depression storage (DS) considering different rainfall return periods. It is observed that the DEM grid size highly affects DS, and the higher the grid resolution is, the larger the DS value. However, when the grid resolution reaches a certain value, the maximum DS value decreases. This suggests that a critical grid resolution value exists at which the water storage capacity of depressions is maximized, namely, 20 m in this work (except for the overall area simulation under infiltration). This phenomenon is further verified in two test cases with and without the infiltration process, that is, calculations of the local area and without infiltration area, respectively. This research may facilitate the accurate computation of the DS process, which is greatly affected by the grid resolution, thereby improving the reliability of hydrological models.  相似文献   

Changing properties of precipitation extremes in the urban areas,Yangtze River Delta,China, during 1957–2013     

Longfei Han  Youpeng Xu  Guangbo Pan  Xiaojun Deng  Chunsheng Hu  Hongliang Xu  Hongyi Shi 《Natural Hazards》2015,79(1):437-454

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Coal Permeability Evolution Under Different Water-Bearing Conditions     

Li  Jianhua  Li  Bobo  Pan  Zhejun  Wang  Zhihe  Yang  Kang  Ren  Chonghong  Xu  Jiang 《Natural Resources Research》2020,29(4):2451-2465

Natural Resources Research - The seepage problem of coal-bed methane (CBM) has attracted increasing attention from the research and industry communities. Coal permeability, which is a key parameter...  相似文献   

The effect of estimating areal rainfall using self‐similarity topography method on the simulation accuracy of runoff prediction     

An‐Ming Bao  Hai‐Long Liu  Xi Chen  Xiang‐liang Pan 《水文研究》2011,25(22):3506-3512

Rainfall input for hydrologic modelling is assumed uniformly distributed over the entire catchment. This can lead to significant errors. Investigations of areal rainfall in mountain areas are typically limited by a lack of adequate meteorological and hydrogeological records. This study focuses on areal rainfall in mountain areas within the Kaidu River Basin, China, with the aim of analyzing the influence of areal rainfall on the simulation accuracy of runoff prediction. We conducted a simulation using MIKE 11/NAM rainfall‐runoff model over 92 days of the rain season and compared the simulation error in different methods. On the basis of properties of self‐similarity degree (SSD) in analyzing the detailed characteristics of terrain, areal rainfall was calculated to model the runoff. The results of the model simulations are generally consistent with observed data, indicating that the self‐similarity topography method is able to reflect the spatial change of rainfall. This indicates that the proposed methodology is applicable for the management of water resources in mountain area. The modelling and self‐similarity topography method study allowed quantification of the spatial rainfall and provided an insight into their implications in hydrological forecasting. Copyright © 2011 John Wiley & Sons, Ltd.  相似文献   

Comparison of two great Chile tsunamis in 1960 and 2010 using numerical simulation   总被引：1，自引：0，他引：1  

Ruizhi Wen  Yefei Ren  Xiaojun Li  Rong Pan 《地震学报(英文版)》2011,(5):475-483

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基于改进的主成分分析法提取GRACE时变重力场信号     

李杰  范东明  游为  李蔚  蒋攀 《大地测量与地球动力学》2018,38(4):414-421

针对主成分分析法提取时变重力场模型信号中存在信号泄漏和去条带噪声不明显的问题，提出对球谐位系数主成分分析的改进方法。首先对球谐位系数进行主成分分析，提取主要的模态，再对不同模态根据其自身噪声特点选择合适的滤波方法和参数，最后在此基础上进行信号提取。以CSR发布的2005-01~2013-12(108个月)GRACE时变地球重力场模型进行实验，提取2006-06和2006-12等效水高数据和改进前的主成分分析进行比较，表明此方法在有效地剔除条带误差的同时又使得信号泄漏减小。  相似文献   

基于“三级保护”制度的大连市海岸线保护与利用空间格局          下载免费PDF全文

闫吉顺  王鹏  刘晓璐  赵博  张盼  林霞 《海洋开发与管理》2018,35(8):74-76

为加强大连市海岸线的保护与利用,促进沿海经济可持续发展和海洋生态文明建设,文章根据大连市海岸线(大陆岸线)的自然属性和开发利用程度,基于"三级保护"制度,分析大连市海岸线保护与利用空间格局。研究结果表明:大连市原生岸线占比较低,须采取有效措施整治修复,并适当加固和维护具有生态功能的岸线,保证自然岸线保有率约在36%;渔业岸线利用率最高,黄海以渔业、临港产业、旅游业和工业等为主,渤海以工业和渔业为主;严格保护岸线主要分布在金普新区,大连市市辖区和旅顺口区黄、渤海海岸,限制开发岸线主要分布在黄海庄河市境内和渤海长兴岛东侧海岸,优化利用岸线主要分布在黄海大连湾、大窑湾以及渤海太平湾、金州湾。未来应"一段一效"地推进海岸线保护与利用管理机制的具体落实。  相似文献   

GABE: Galaxy Assembly with Binary Evolution     

Zhen Jiang  Jie Wang  Liang Gao  Feng-Hui Zhang  Qi Guo  Lan Wang  Jun Pan 《天文和天体物理学研究(英文版)》2019,(10)

We developed a new semi-analytic galaxy formation model: Galaxy Assembly with Binary Evolution(GABE). For the first time, we introduce binary evolution into semi-analytic models of galaxy formation by using the Yunnan-II stellar population synthesis model, which includes various binary interactions. When implementing our galaxy formation model onto the merger trees extracted from the Millennium simulation, it can reproduce a large body of observational results. We find that in the local universe, the model including binary evolution reduces the luminosity at optical and infrared wavelengths slightly, but it increases the luminosity at ultraviolet wavelengths significantly, especially in FUV band. The resulting luminosity function does not change very much over SDSS optical bands and infrared band, but the predicted colors are bluer, especially when the FUV band is under consideration. The new model allows us to explore the physics of various high energy events related to the remnants of binary stars, such as type Ia supernovae, short gamma-ray bursts and gravitational wave events, and their relation with host galaxies in a cosmological context.  相似文献   

县级海域生态环境质量评价技术方法研究 ——以普陀区海域为例          下载免费PDF全文

黄小露  闫吉顺  王权明  张广帅  王鹏  张盼 《海洋开发与管理》2019,36(11):59-63

文章构建了县级海域生态环境质量评价指标体系,建立了县级海域环境质量系数计算模型、县级海域生态质量系数计算模型以及县级海域生态环境质量综合评价模型,定义了县级海域生态环境质量评价流程。以普陀区海域为例,对县级海域生态环境质量进行综合评价,并针对关键问题和主要影响因素,提出实而可行的合理化建议,以及改善县级海域生态环境质量的长效机制。  相似文献   

基于ArcGIS的城镇土地定级方法的研究     

邱春霞  席敏哲  刘潘  董乾坤 《测绘地理信息》2021,46(4):87-91

基于GIS(geographic information system)技术,提出了一种新的土地影响因子单元级别划分方法——路径距离分析法,该方法综合考虑了地形起伏和河流等"障碍",增加了"桥头堡"效应,提高了影响因子单元定级的合理性,同时免去了传统方法中的修正体系,极大提高了土地定级的效率.并以陕西省延安市某县城区土地定级为例,利用特尔斐法确定影响因子和各因子的权重,利用ArcGIS的路径距离分析法划分影响因子的单元级别,通过多因素综合法叠加得出土地定级图.实验表明,路径距离分析法的土地定级更加合理,可用于城镇基准地价评估.  相似文献