HF Radar detected water wave velocity and current velocity over the Northern Jiangsu Shoal

高频地波雷达遥感监测技术比起传统监测技术和卫星遥感技术，独具优势：探测精度高，实时性好，不受恶劣天气及海况的影响，可连续大面积监测海洋表面，已经成为海洋环境立体化监测网中最重要的技术支撑之一。中国东部沿海以强潮宽陆架为特征，潮间浅滩广为发育，动力环境相对复杂，亟待形成适用于潮间浅滩的高时空密度海面流场观测能力。 然而，在平均水深一般小于5m的潮间浅滩，高频地波雷达反演海面动力参数的假设发生改变：其波速按微幅波理论偏离深水波频散关系，据浅水波理论也偏离双向同速传播假设，再加上高频地波雷达探测目标与现场仪器探测目标在浅水条件下的更复杂关系，各环节引入偏差在潮间浅滩普遍增大，以致高频地波雷达反演海...Compared with traditional monitoring techniques and satellite remote sensing technology, HF radar possesses many distinctive advantages such as more accuracy and high time resolution. Besides, HF radar is free from stormy weather or sea conditions, and can monitor large area of ocean surface. Thus, it has become one of the most important means in the dimensional monitoring network for ocean enviro...学位：理学硕士院系专业：海洋与环境学院环境科学与工程系_环境科学学号：2262010115141

HF Radar detected water wave velocity over the Northern Jiangsu Shoal

应用雷达波dOPPlEr正频移与负频移信号联解波速和径向流速方法,在2011年7月苏北浅滩高频地波雷达观测试验中实现潮间浅滩海面波浪传播速度的观测.基于频移与波速两级数据质量控制后统计的苏北浅滩平均波速平面分布图,可分辨出与潮间浅滩、水下岸坡和潮汐水道等浅滩地貌单元相关的波速分区格局.同步检验表明:雷达观测波速与现场观测水深的关系统计意义上遵循微幅波理论,径向流速较大条件下的波速观测质量较好,复杂地形所致双向波速不等现象导致波速观测质量降低,高频地波雷达是潮间浅滩动态遥感监测的潜在工具.High-frequency(HF) radar systems can provide wave velocity and radial current by identifying and tracking frequency shifts in the peaks of the Doppler spectra of the ocean backscatter corresponding to the advection of the Bragg wave.Data used in this study was collected by HF radar experiment for the Northern Jiangsu Shoal in July 2011.A distribution of monthly average wave velocity was generated with data that is quality controlled particularly.The intertidal flat, offshore shoal and tidal channel, associated with low speed area, high speed area and high speed belt respectively, could be distinguished by the HF radar mapped wave velocity distribution.After compared with datasets of field measurement and calculate results, it is revealed that(1) the relationship between water depth and monthly average wave velocity fits the theory of Airy Wave,(2) large radial currents may rise measurement accuracy of wave velocity, and 3) mismatch of approaching and leaving wave velocity related to complex topography may reduce measurement accuracy.海洋公益性行业科研专项经费(201005012;201005006); 国家自然科学基金(40876031); 国家高技术研究发展计划(2012AA091701); 江苏省科技计划项目基础研究计划(SBK201150144)资

HF Radar detected summer surface current field over the radial sand ridge field in the southern Yellow Sea

利用2011年7月的高频地波雷达观测与现场同步常规观测资料和卫星风场资料,分析南黄海辐射沙脊群夏季表层余流特征.结果表明,南黄海辐射沙脊群近岸海域的表层余流向海辐散,外围海域的夏季表层余流向北.南黄海辐射沙脊群近岸海域表层余流的辐散格局主要受潮波与沙脊群水下地形的相互作用影响,外围海域夏季的北向表层余流格局主要受风场的控制.高频地波雷达观测的余流场为南黄海西部夏季浒苔迁移和平面分布的解释提供了佐证.Surface current field over radial sand ridge field in the south Yellow Sea was analyzed based on the data collected by using the shore-based high frequency radar and the Acoustic Doppler Current Profiler(ADCP)in July 2011 and the QSCAT wind data.In near-shore shallow water,the residual current was radially offshore;in far-shore deep water,the residual current was northward.In far-shore deep water,the current pattern was mainly influenced by the wind,while in near-shore shallow water the current pattern was due to the influence of the interaction of underlyingbathymetry and tide waves.The HF Radar survey is suitable for trends analysis of long-term current field.The result supports the hypothesis that the green algae enteromorpha prolifera came from Jiangsu coast and subsequently expanded to the southern Yellow Sea.国家重大科学研究计划(2013CB956502); 海洋公益性行业科研专项经费(201005012;201005006); 国家自然科学基金(40876031;41376044); 国家高技术研究发展计划(2012AA091701

Prediction of Energy Resolution in the JUNO Experiment

International audienceThis paper presents the energy resolution study in the JUNO experiment, incorporating the latest knowledge acquired during the detector construction phase. The determination of neutrino mass ordering in JUNO requires an exceptional energy resolution better than 3% at 1 MeV. To achieve this ambitious goal, significant efforts have been undertaken in the design and production of the key components of the JUNO detector. Various factors affecting the detection of inverse beta decay signals have an impact on the energy resolution, extending beyond the statistical fluctuations of the detected number of photons, such as the properties of liquid scintillator, performance of photomultiplier tubes, and the energy reconstruction algorithm. To account for these effects, a full JUNO simulation and reconstruction approach is employed. This enables the modeling of all relevant effects and the evaluation of associated inputs to accurately estimate the energy resolution. The study reveals an energy resolution of 2.95% at 1 MeV. Furthermore, the study assesses the contribution of major effects to the overall energy resolution budget. This analysis serves as a reference for interpreting future measurements of energy resolution during JUNO data taking. Moreover, it provides a guideline in comprehending the energy resolution characteristics of liquid scintillator-based detectors