潮汐动水位条件下抛石层内注稠浆的施工技术

介绍了厦门杏林镇马銮海堤工程施工条件、地质情况、注稠浆成孔方法、注稠浆浆液各种参数及施工工艺。

Multi-effect distillation system for seawater desalination driven by tidal energy and low grade energy

A multi-effect distillation technology for seawater desalination driven by tidal energy and low grade energy is presented.In the system,tidal energy is utilized to supply power instead of coventional electric pumps during the operation,resulting in the decrease of dependence on steady electric power supply and a reduction in the running costs.According to the technological principle,a testing unit is designed and built.The effects of the feed seawater temperature and the heat source temperature on the unit performance are tested and analyzed.The experimental results show that the fresh water output is 27 kg/h when the heating water temperature is 65 ℃ and the absolute pressure is 25 kPa.The experimental and theoretical analysis results indicate that the appropriate heating water temperature is a key factor in ensuring the steady operation of the system.

东寨港流域地表水水化学组成特征及其成因

为研究滨海地区地表水资源和红树林生态系统的水环境,利用水化学分析、数理统计和Gibbs水-岩分析模型等方法对东寨港流域内演丰西河和三江河两条河流水体的水化学组成和氢氧稳定同位素特征进行分析,揭示了演丰西河和三江河河流地表水的水化学组成特征,讨论了该区域地表水的水化学组分变化及其控制因素。结果表明:演丰西河地表水的水化学类型以Na-Cl型为主,三江河地表水的水化学类型从Na·Ca-Cl·HCO;型转变为Na-Cl型;演丰西河和三江河河流地表水的水化学组成特征均主要受蒸发结晶和岩石风化作用的控制,而海水潮汐混合作用和红树植物的生理功能使演丰西河流域的蒸发作用更强烈,岩石风化作用则对三江河地表水水化学类型的影响较大;对演丰西河和三江河地表水体中氢氧同位素分析显示,两条河流的主要补给来源均为大气降水,且均受到二次蒸发作用的影响;海水潮汐混合作用对演丰西河地表水水化学组成的影响较大。

Tidal Analysis of High and Low Water Data

The harmonic analysis method based on high and low water levels is discussed in this paper. In order to make full use of the information of high and low water observations (the time derivative of water level at the observation time is zero), the weight coefficient, w, is introduced to control the importance of the part related to this information in the error formula. The major diurnal constituents, O 1 and K 1, and semi diurnal constituents, N 2, M 2 and S 2 are selected directly from the monthly data analysis, and some other important constituents, P 1, ν 2 and K 2, are included as the inferred constituents. The obtained harmonic constants of the major constituents are very close to those obtained from the analysis of hourly data, and this shows that high and low water data can be used to extract tidal constants with high accuracy. The analysis result also shows that the inference and the weighting coefficient are important in the high and low water data analysis, and it is suggested that w ≥1 should be taken in monthly high and low water data analysis. This analysis method can be used directly to analyze altimetric data with w =0.

基于高中数学建模核心素养提升的课例设计与思考

数学建模是数学核心素养的重要组成部分,数学建模是联系数学与实际应用的重要桥梁,是通往应用数学的必经之路,对培养拔尖创新型人才非常重要。本文以“海水潮汐与港口水深问题”为主题,以数学建模基本环节作为主线,开展了一次数学建模课堂教学活动,例析高中数学建模核心素养如何落地,尝试探索数学建模的教学策略和路径。

陕西地区环境因素对重力影响研究

针对不同环境因素对重力影响,采用经典的负荷理论,计算了陕西地区大气、陆地水储量以及非潮汐海水变化等环境负荷引起的重力效应并与西安地震台连续重力数据进行了对比。结果表明:西安台重力残差季节性信号中,全球和局部的大气负荷效应占主要成分,其对周年振幅贡献达79%,其次是陆地水负荷效应,其对周年振幅的贡献为20%,而非潮汐海水负荷效应非常小,其贡献不足1%。此外,陕西地区陆地水负荷重力效应呈现明显的分区特征,并且由于采用的陆地水同化模型GLDAS没有考虑台站附近地下水的实际影响,导致综合模拟结果与PET重力仪实际观测结果存在约50 d的时间延迟。