山泉水

作者:水商網
山泉水的含義:

山泉水,山上泉眼產生的天然水。是我國民間特別認知的一種飲用水,陸羽在其著作《茶經》中指出,山水上,河水中,井水下,認為用來泡茶的水,以自山中流出的山泉水最佳,所以普遍認為山泉水是飲用水中的極品。

山泉水的知識:

泉是地下水天然出露至地表的地點,或者地下含水層露出地表的地點,大多位于沖積扇頂部。當含水層或含水通道被破壞露出地表時,地下水便涌出地表成泉。泉是地下水的一種重要的排泄方式。地下水雖然分布很廣,但泉卻不是到處都有的,而是在特定的地形、地質、水文地質條件下才可能涌出成泉。一般在山區和丘陵的溝谷中及山腳下,在平原地區比較少見。根據水流狀況的不同,可以分為間歇泉和常流泉。如果地下水露出地表后沒有形成明顯水流,稱為滲水。

泉水的來源通常是滲入地層的大氣降水,例如雨水和融化的雪水。大型泉主要分布在石灰巖和火山熔巖構成的巖層中。礫石、砂、石灰巖、砂巖和玄武巖都可以構成泉水的含水層,在其露出地表處通常有粘土或頁巖形成的隔水層。當含水層上方的隔水層承受很大壓力時,泉水便會自動上涌至地表,形成自流泉。

根據水流溫度,泉可以分為溫泉和冷泉。泉可以按照其流量大小分為八級,一級泉的流量超過每秒100立方英尺(2800升),二級泉的流量在每秒10到100立方英尺之間,八級泉流量則小于每分鐘1品脫(每秒8毫升)。
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