第二百二十八章 温差边界
第二百二十八章温差边界(第1/2页)
那面墙底部和土坎切口之间的温差线,在晨光中显得比昨天更清晰。像是墙体内部的热量正在沿着那道温差边界缓慢移动,把热量的轮廓线从墙体表面迁移到土坎底部,又沿着土坎底部的地层继续向更深的位置递送。阿月蹲在温差边界线的位置,沿着那道边界线的走向又走了一趟,从壁龛外侧走到土坎切口,又从土坎切口走到坡顶裂隙。每走一段距离就蹲下来用手掌贴着地面或墙体表面感受一次温度和湿度的变化。温差边界线在土坎切口处颜色加深,像是热量在这里集中后正在向地下传导。在坡顶裂隙处颜色变浅,像是热量在这里已经逐渐散去。
她沿着温差边界线走完第三趟之后蹲在土坎切口边缘,把铁镐接过来沿着温差边界线的走向又切了一刀。镐尖切入土坎底部的地层时遇到了一层比周围更硬的阻力,像是切到了一层质地致密的沉积层。她沿着那道阻力的边缘又切了一刀,切下来的土块断面颜色比周围的土更深,像是含有某种矿物成分。
赵铁蹲在她旁边,也用手掌贴着那道沉积层的断面感受了一下质地,又用手指沿着断面边缘刮了一下:“像是含铁的沉积层,长期受潮后形成的铁质结壳。墙体内部的水道含铁量较高,水流经墙体时携带的铁质在墙体底部沉积下来,形成了一层含铁的沉积层。”
阿月没有说话,她用手掌贴着那道沉积层的表面感受了一下温度和湿度。那道沉积层与墙体内部的温差线没有交汇,而是与温差线保持着一道平行间距,像是含铁的沉积层本身已经沿着墙体的底部自然形成,墙体内部的温差线正在沿着那道沉积层的边缘缓慢移动,两者之间形成了固定的间距,像是墙体的温度正在沿着那道沉积层自然流动。她沿着那道沉积层的走向又走了一趟,沉积层的走向与土坎底部的切口方向一致,没有偏离,像是墙体内部的水道在土坎底部转向地下之后,含铁的水分在转向处沉积下来,形成了一道与水道平行的含铁层。
她站起来,沿着土坎底部的方向又走了几步,在土坎底部与地面相接的夹角处蹲下来,用手掌贴着地面感受了一下那道夹角底部的温度和湿度。夹角底部的土质与墙体底部的沉积层相似,像是含铁的水分正在沿着墙体底部渗入地表,在墙体与地面的交汇处形成了一道与含铁沉积层相似的质地层。她沿着那道夹角底部又摸了一段距离,确认了夹角底部与墙体底部的沉积层是连续贯通的。那道含铁的沉积层与土坎底部切口的方向一致,像是墙体内部的水道在土坎底部转向地下之前,先在墙体底部形成了一道含铁的沉积层,然后沿着这道沉积层继续向前延伸,穿过坡顶裂隙,继续向更深的地层渗透。她站起来,沿着沉积层延伸的方向又走了几步,走到那道沉积层在地面消失的位置,沿着那道沉积层消失的位置,把另一块从旧城墙根带回的骨粉碎片放在消失的位置旁边。她看着它,像是在确认它能把下一段路径的位置画清楚。
(本章未完,请点击下一页继续阅读)第二百二十八章温差边界(第2/2页)
赵铁蹲在沉积层消失的位置,沿着那道沉积层消失前的最后一段走向又摸了一遍:“沉积层消失的位置与坡顶裂隙的末端相距不远,像是墙体内部的水道在进入坡顶下方后转向了更深的地下。”
阿月没有说话,她沿着那道沉积层消失前的最后一段走向走了一遍,在沉积层消失的位置蹲下来,用手掌贴着地面感受了一下温度和湿度,然后站起来沿着沉积层的走向走回墙体底部。她蹲在壁龛外侧,沿着墙体底部那道温差边界的位置又摸了一遍,确认温差边界的走向与沉积层的走向一致之后,她沿着墙根走回院门口,侧着头看了看天色。那道温差边界和含铁沉积层之间的固定间距没有随着距离的延长而改变。她走进灶间,从窗台上把陶罐端下来,用一块干布擦拭了罐身底部新出现的一道细小的水珠,又把它放回窗台。那层水珠覆盖的面积不大,但它在继续扩散,像是正在用它的覆盖范围替她标出下一段路径的终点位置。
风从墙根下吹进来,绕过她脚踝的时候带着一丝铁锈味。她没有回头,只是蹲在墙根边,用手掌贴着那道温差线的末端,侧着头,像是在等自己的呼吸频率和那道沉积层在墙根与土坎之间留下的余温彻底同步。
院子里的光线正在向西移动,窗台上那件陶罐底部的湿痕已经干透了,只留下一道细长的水痕,在暮色里显得比刚才浅淡了一些。
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