彭州湔江水生态河道整治工程二期.pdf

彭州市湔江水生态河道整治工程（二期） 湔江堰闸坝生态影响分析专章 建设单位：四川龙门山文化旅游发展有限公司 编制时间：二零一九年一月 前言 湔江堰原拦河坝建成于 1962 年，枢纽建筑物由拦河大坝及左岸东河取水口、 右岸西河取水口组成。多次改造后的湔江堰拦河大坝，左、右两岸分别设 3 孔 6m 宽的冲砂闸，河床中部砼溢流坝段长 116m，大坝正常挡水高度8.5m，坝下 游冲砂闸段消力池护坦长40m ，溢流坝段消力池护坦长度37m 。然而湔江堰无法 解决坝上游的推移质泥沙淤积问题；河道水景观差，无法满足丹景山景区提出的 景观要求；灌溉和供水保证率低；同时东西河取水口进水口闸门存在安全隐患， 自动化水平低。因此，为确保输水通畅，改善河道水环境，必须进行整治。 本次拟整改内容包括将原溢流坝改为拦河闸坝，改造两岸东河、西河进水口， 两岸上游侧长度约217m 的护岸工程以及右岸长430.00m 的现状堤防基础加固工 程。 项目建成后，一方面可通过对湔江堰拦河坝的改造，改善东河、西河灌溉用 水取水条件，提高供水可靠度；二方面是根据国家4A 级丹景山景区要求，提高 拦河坝原正常挡水位，坝上游形成 1150m 长的宽阔水面，将左岸的寿阳山及右 岸的牛心山连接起来，从而形成一个漂亮的湖面，同牡丹小镇连成一片，成为国 家4A 级丹景山景区中的一道靓丽景观；三方面可以提升闸室控制自动化水平。 按照《中华人民共和国环境保护法》、《中华人民共和国环境影响评价法》和 《建设项目环境保护管理条例》（国务院2017 年第682 号令）的要求，建设项目 应进行环境影响评价。根据《建设项目环境影响评价分类管理名录》的相关规定， 本项目环境影响评价工作类别为编制环境影响报告表。为此，四川龙门山文化旅 游发展有限公司委托我公司承担了该项目生态影响分析专章工作。我单位接受委 托后，即派有关技术人员对本项目进行了现场实地踏勘及资料收集等工作，并对 业主提供的技术资料进行了初步的工程分析。在此基础上，依照环境影响评价的 技术规范的要求，编制本项目生态环境影响分析专章上报审查。 目录 1 概论·················································································································1 1.1 评价范围·····································································································1 1.2 评价时段·····································································································1 1.3 生态敏感点与保护目标 ···················································································1 1.4 评价内容·····································································································2 1.5 生态影响评价技术路线 ···················································································3 2 评价区生态环境现状调查······················································································4 2.1 生态功能定位·······························································································4 2.1 评价方法