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第三百七十五章 千金渠,连发投石机的威力(1 / 2)

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“砰—砰—砰”的声音接连响个不停,仿佛撞击在在场每个人的心口上,声音也很大、大的震耳欲聋,还不时溅起阵阵灰尘飘入不远处的千金渠中,但好在只是些泥土灰尘、影响不大,不像后世有那么多的污染让人的身心不可接受……

千金渠系统位于洛阳城西北,以谷、瀍二水为源,利用千金堨蓄积水源,千金渠引水东流入洛阳城,并开挖五龙渠、代龙渠、长分沟等排水渠分泄洪水。拥有蓄水、引水、排水多种功能。

洛阳盆地的水利发展历史悠久,洛阳较为原始的水利灌溉可能在夏商时代即已兴起。

《战国策·东周策》载:“东周欲为稻,西周不下水;西周既下水,东周复种稻。”可见在东周时期,此地已经出现河流上游控制下游水量的现象,同时也能反映出该区东周农业生产对于洛水的依赖及该区水利灌溉较为发达。

汉魏洛阳城是在西周城址的基础上,出于适应社会发展需要,经过春秋晚期、秦代的增扩,东汉、曹魏等时代的修缮和增筑活动,才逐建形成的。随着王朝兴替,该区水利设施也经历多次毁坏、重修。

千金堨水利系统汇集涧、瀍二水的上游水量,千金堨作为堰坝设施,面临着巨大的泄洪需求,故其排水既包含着天然泄洪渠道,又有人工排水渠的存在。

受人为截流影响,谷水、瀍水南流河道废弃,但在降水较多年份,二水南流故道将作为天然泄洪渠道使用。

谷水经东周王城南注于洛水,其河道约同今日的涧河。

起初,可能由于河道窄浅,不像今日的涧河宽近百米、深达数十米,干旱季节经常断流,故当时称为“死谷”,如今正值盛夏,却是在丰水期,水量还不小,

此外,《水经注》引《地记》:“洛水东北过五零陪尾北,与涧、瀍合,是二水东入千金渠,故渎存焉。”

千金堨形成的蓄水库南有瀍水故道通洛水,作为蓄水库溢洪渠道的尾渠,以备洪水宣泄,保证千金堨的安全,使洛阳城免受洪水灾害。

除天然泄洪渠道外,为了保障水道畅通,千金渠系统修建时溢流工程多兼顾泄洪功能,排水渠顾名思义为排泄洪水而设,主要包括五龙渠、代龙渠(九龙渠)及长分沟等排水渠。

因其所处位置不同,五龙渠、代龙渠主要为排泄千金堨蓄积洪水,延长千金堨蓄水工程的使用年限;长分沟则承载千金渠泄洪压力,

洛阳城市用水,主要依靠谷水和瀍水,虽然二水距城较远,但其海拔多在 150米以上,可实现自流引水。

千金堨的引水渠首是在东周王城西北处“湖沟”。这里是山区进入平原的谷口,谷水河道未定,河床纵比降大,易获得落差,引水方便。

其取水枢纽位置的选择靠近在河流由山谷进入平原的“谷口”位置,在这个位置,河床由窄变宽,坡度由陡变缓。

在此布置取水枢纽,不仅便于因势利导控制水流,又便于施工。“湖沟”又可称为谷水坞,即千金堨工程引谷入瀍渠道的渠首设施,设置在谷水出山口弯曲河道的凹岸顶点下游的位置,大致处于 210米等高线处,有利于取水防沙,属于无坝取水。

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