共查询到19条相似文献，搜索用时 125 毫秒
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通过对云南4个水位观测点模拟与数字化并行观测资料的对比分析,认为同一个观测点的模拟与数字化观测数据内在质量接近、数据相关性好、数据的变化形态及地震同震响应特征相似,在这些并行观测的观测点上数字化观测可以取代模拟观测. 相似文献
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北京地区流体观测方法记录到的汶川大地震同震变化 总被引：1，自引：0，他引：1
2008年5月12日发生的汶川8.0级巨大地震中,北京地区的一些流体观测仪器记录到了不同程度的同震响应。为了进一步深入研究该次强烈地震对北京地区未来地震活动趋势的影响,系统搜集、整理归纳了该次巨大地震引发的北京地区流体观测仪器记录到的同震响应信息,将北京地区的流体同震现象进行概括,然后分析了数字化流体分钟值观测资料同震效应的表现形态及其变化特征,验证了新安装的一些数字化流体观测仪器的可靠性、灵敏性,对相关流体观测仪器可能存在的一些问题进行了讨论。 相似文献
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为了保证地震监测数字仪实时系统数据记录连续可靠，不出故障，提出了以多线程技术结合数据流式拷贝方法，建立自动备份兼故障报警系统，达到实时保护数据的目的。该系统实际应用效果 相似文献
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通过对甘肃地区的"十五"数字化观测台网水位资料的年、月、日动态特征以及主要影响数字化水位资料的干扰因素等进行分析,发现大多数井点的资料连续可靠,特大地震的震后效应明显。目前数字化水位观测中存在的问题是个别井点的水位动态存在一些明显的突变和缺数。根据以往的震例总结,年变规律明显的井点,有可能在地震中期或中短期前兆异常监测中发挥一定的效能;观测资料日均值月动态和时均值日动态规律明显的井点,在地震短期或短临前兆监测中有可能发挥一定的效能。潮汐理论用于模拟观测资料的处理方法,也可以在数字化观测资料中应用。总体来说,甘肃地区"十五"数字化水位观测质量明显要高于"九五"台网的质量。 相似文献
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甘肃及邻区数字化水位观测资料的应用与地震监测效能评估 总被引：2，自引：0，他引：2
甘肃及其附近地区已建成的数字化水位观测点共有12个, 其中模拟与数字化观测同时运行的只有甘肃平凉一个测点。 文中分析了数字化水位的年、 月、 日动态特征以及数字化资料的应用。 分析了主要影响数字化水位资料的干扰因素, 分析结果发现, 数字化水位观测中目前较为突出的问题是水位动态中存在较大幅度的脉冲和突变。 根据以往的震例总结, 认为有可能识别出破年变为标志的中期前兆异常, 以阶变和脉冲为特征的短期异常很难识别。 潮汐理论用于模拟观测资料的处理方法, 仍然可以在数字化观测资料中应用。 相似文献
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平凉C11井地下流体数字化观测资料的分析 总被引：1，自引：0，他引：1
C11井是甘肃唯一一口数字和模拟观测同时并行的地下流体观测井, 2001年9月开始数字观测正式产出资料, 与模拟观测相比, 数字化观测数据信息量大, 传输速度快, 人为误差小。 该文分析了平凉C11井数字化水位、 气压、 水温等测项观测资料。 结果表明, 数字水位动态与模拟水位动态一致性较好、 数字水位与数字气压动态之间相关性较好, 数字水温与模拟水温的动态一致性不如水位好; 数字水位的潮汐效应非常明显, M2波潮汐因子相当稳定(平均值1.1538), 相对误差较小(平均值0.0215)。 相似文献
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Existing analytical procedures for nonsteady flow in a leaky confined aquifer assume that the aquifer system is areally infinite. A technique is presented that treats a leaky confined aquifer system of finite configuration. By means of a discrete space continuous time (DSCT) modeling approach, the partial differential equation governing the flow system is transformed into a set of ordinary differential equations that can be easily integrated numerically on a high speed digital computer using available scientific subroutines. The finite difference formulation is in effect an explicit scheme. A criterion is developed for which the scheme is computationally stable. A numerical example is presented. 相似文献
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基于SZW．1A型数字式温度计（V2004）的维护管理经验和仪器组成,对SZW．1A型数字式温度计（V2004）的通讯故障原因进行了研究。结果表明,导致SZW-1A型数字式温度计（V2004）通讯故障的主要原因有网络链路故障、网络通讯接口故障和仪器主机故障3大类。针对SZW-1A型数字式温度计（V2004）常见非网络链路通讯故障的判定提出了一套诊断流程,并提出了该型号数字式温度计常见通讯故障的排除方法。这些故障的排除方法,对和SZW-1A型数字式温度计（V2004）有类似硬件组成的SWY-1A型水位仪、SWY-Ⅱ型水位仪、SWDW-1型水位地温综合观测仪等“十五”流体观测仪器的维护,有一定参考意义。 相似文献
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Assessing the digital filter method for base flow estimation in glacier melt dominated basins 
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下载免费PDF全文 Base flow is an important component of streamflow. Although the simple digital filter method is widely used for base flow separation, the applicability in alpine rivers mainly dominated by glacier melt has not been described in detail. To assess and improve the performance of base flow estimates using the filter method for catchments dominated by glacier melt, the enhanced Soil Water Assessment Tool (SWAT) is used to obtain the estimates of streamflow and base flow for three catchments with different glacier melt contribution in arid and cold Northwestern China. The digital filter is then applied to the simulated streamflow to separate base flow and assess how well the base flow by the filter method matches these obtained using the SWAT model. In order to obtain the best match between the base flow by the filter method and those using the SWAT model, the linear regression model is used to estimate the relation between the filtered base flow and the glacier melt. It was found that the filtered base flow was matched well with base flow using the SWAT model during the low‐flow period. However, the base flow based on the digital filter method was overestimated during the high‐flow period, especially for the Manas River and Kumarik River. The base flow indexes by the digital filter estimates were 2.9%, 33.3% and 100% larger than those of the model method for the Gongnaisi River, Manas River and Kumarik River, respectively. The differences are larger with bigger glacier melt contribution. The performance of the digital filter is affected by the glacier melt, and it can be improved significantly by the combination of filtered base flow and the glacier melt. The base flow indexes by the improved filter are 1.5%, 4.4% and 10.7% larger than those of the model method for the Gongnaisi River, Manas River and Kumarik River, respectively. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
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G. R. Hancock 《地球表面变化过程与地形》2008,33(3):459-474
The current generation of landscape evolution models use a digital elevation model for landscape representation. These programs also contain a hydrological model that defines overland flow with the drainage network routed to an outlet. One of the issues with landscape evolution modelling is the hydrological correctness of the digital elevation model used for the simulations. Despite the wide use and increased quality of digital elevation models, data pits and depressions in the elevation data are a common feature and their removal will remain a necessary step for many data sets. This study examines whether a digital elevation model can be hydrologically correct (i.e. all depressions removed so that all water can run downslope) before use in a landscape evolution model and what effect depression removal has on long‐term geomorphology and hydrology. The impact on sediment transport rates is also examined. The study was conducted using a field catchment and a proposed landform for a post‐mining landscape. The results show that there is little difference in catchment geomorphology and hydrology for the non‐depression removed and depression removed data sets. The non‐depression removed and depression removed digital elevation models were also evaluated as input to a landscape evolution model for a 50 000 year simulation period. The results show that after 1000 years there is little difference between the data sets, although sediment transport rates did vary considerably early on in the simulation. Copyright © 2007 John Wiley & Sons, Ltd. 相似文献