共查询到19条相似文献,搜索用时 93 毫秒
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在黄河建设水质自动监测站面临诸多困难,需要重点研究多泥沙河流水质自动监测水样采集、样品前处理、系统远程监控等关键技术问题.黄河流域水资源保护局开发了带拦污栅的采样双体船和可吊装箱体,研制了具有故障自动报警和泥沙反冲洗功能的五级可调式水样前处理装置以及自动除藻装置、水下传感器自动冲洗装置、断水断电的自动保护装置等,引进了国外先进技术和设备,成功地建设了水质自动监测站.在黄河水量调度、引黄济津和突发性水污染事件中,自动站发挥了人工监测不可取代的作用,做到了对水污染抓得住、测得准、传得快. 相似文献
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对安徽省淮河蚌埠闸以上干流2个水质监测断面的水质监测资料用偏差分析的方法,研究确定水质常规监测采样频率的方法。对1998年以来淮河蚌埠闸以上干流和颍河干流安徽段7个监测断面的水质常规监测数据进行了正态性检验,并对1998年以来的12个监测断面水质常规监测数据用统计学的方法,研究确定水质常规监测采样频率的方法。 相似文献
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基于全国第二次水资源调查评价成果,对松花江区地表水资源质量现状进行综合概述。松花江区的地表水体污染严重,以有机污染为主,主要污染指标是CODMn;综合评价水质劣于Ⅲ类的河长占总河长的62.7%;湖泊、水库基本处于中富营养和富营养状态,水质多为Ⅴ类和劣Ⅴ类。汛期污染重于非汛期,面污染源影响大于点污染源;有机污染主要来自农村和田野,城市工业和生活污水也是重要的污染源。 相似文献
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通过对长江流域片河流、湖泊、水库及省界水体2003~2017年15 a间的水质监测评价成果进行梳理,分析了流域片水资源质量状况及其变化趋势。分析结果表明:①长江流域片河流水质总体较好,以符合或优于Ⅲ类标准为主,长江干流水质以Ⅲ类为主且总体趋好。②金沙江石鼓以上、雅鲁藏布江等水资源二级区水质良好,但湖口以下干流水系、太湖水系等水域水质相对较差。③流域片近年来废污水排放总量得到了较好的控制,同时,污水处理率也得到了快速提高,对流域水资源质量改善起到了一定的积极作用;流域片湖泊水质总体较差且有恶化的趋势。④水库水质相对较好,以Ⅱ类~Ⅲ类为主,但近年来也存在恶化的风险。⑤湖泊富营养化程度较高,水库富营养化程度相对较低,但近年来流域片湖库均呈现出营养水平从低营养状态向高营养状态变化的趋势。⑥长江流域片省界水体水质以符合Ⅰ~Ⅲ类标准为主。⑦纳入评价范围的水功能区总体达标率在60%左右,其中纳入国务院批复的重要水功能区达标率相对稍高。⑧以目前水功能区达标的水平,要全面达到管理目标、实现流域片水质的根本性好转和全面改善,尚任重道远。 相似文献
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To study the characteristics of water quality variation in the Pearl River Estuary during the recent years, the water quality in the Pearl River Estuary is evaluated and the tempo-spatial distribution characteristics of water quality is analyzed, based on data from 51 monthly collected water quality sampling points from 2018 to 2020, with evaluation indices filtered using principal factor analysis and improvement on traditional comprehensive water quality identification index method using combinatorial integration method.Results show that the comprehensive water quality identification index method combined with combinatorial integration method takes both excessive pollutants index and other indices into account, so as to obtain reasonable and reliable results, which means the method is suitable for large-scale watershed water quality assessment. The water qualities in all drainages tend to improve over the years, mainly from class of inferior Ⅴ to Ⅲ, which met the water quality goals in water environment function zones. The water quality in the western regions was slightly worse than that in the eastern regions.The river water quality in the Nanshan district was better than that in the Dakonggang district, however the improvement in river water quality in Dakonggang and Qianhai district was more significant. The water quality of the upstream was generally better than that of the downstream. Estuary water quality fluctuates greatly with the seasons, which was generally affected by sea water pollution and the tidal sluice operations. © 2022, Editorial Board of Water Resources Protection. All rights reserved. 相似文献