本文選題：水質(zhì) + 趨勢�。� 參考：《長江流域資源與環(huán)境》2017年06期

【摘要】：為全面研究三峽水庫蓄水之前至175 m蓄水運(yùn)行期庫區(qū)水質(zhì)變化趨勢和因蓄水導(dǎo)致水文條件變化后懸浮物、高錳酸鹽指數(shù)、總磷等主要污染因子變化及其相互關(guān)系,通過對2000~2015年三峽水庫水體水質(zhì)狀況進(jìn)行分析,得出如下結(jié)論:三峽水庫干流水質(zhì)較好,其受水期及水庫蓄水調(diào)度影響明顯但逐漸減弱。受蓄水導(dǎo)致的水流條件變化、上游來水、支流匯入及沿程點(diǎn)面源污染等因素影響,干流沿程各斷面水質(zhì)變化趨勢不完全一致;除清溪場和沱口斷面外,從庫尾到庫首水質(zhì)評價(jià)結(jié)果優(yōu)于Ⅲ類的比例總體呈上升趨勢。受蓄水影響,御臨河、小江、大寧河及香溪河河口斷面水質(zhì)均呈下降趨勢。三峽水庫上游來水懸浮物含量變化與水期存在較好相關(guān)性,但自2013年開始上游來水各水期懸浮物含量均下降,懸浮物通量較2013年之前平均降低約80%。水庫庫中、庫首斷面近年來懸浮物含量在豐水期和平水期下降,其后逐漸趨于穩(wěn)定,枯水期變化不明顯。蓄水后主要支流河口懸浮物含量大部分時(shí)段低于庫區(qū)干流同期,上游支流河口斷面懸浮物含量受水期影響較庫區(qū)中下游支流河口明顯。干支流各斷面高錳酸鹽指數(shù)和總磷在各水期變化趨勢各異,上游斷面豐水期變化較下游斷面明顯;隨著蓄水進(jìn)程,各斷面高錳酸鹽指數(shù)和總磷在平水期和枯水期之間、斷面間差異越來越小。懸浮物含量與高錳酸鹽指數(shù)、總磷等參數(shù)之間存在一定的相關(guān)性,但在較長時(shí)間范圍,不能通過擬合等手段將水樣一種狀態(tài)的測定結(jié)果推出樣品另一種狀態(tài)近似檢測結(jié)果。
[Abstract]:In order to study the change trend of water quality of the three Gorges Reservoir from 175m to 175m, and the change of suspended matter, permanganate index, total phosphorus and other main pollution factors after the change of hydrological conditions caused by water storage, and the relationship between them, the change of water quality and the relationship between suspended matter, permanganate index and total phosphorus were studied. Through the analysis of the water quality of the three Gorges Reservoir from 2000 to 2015, the following conclusions are drawn: the water quality of the main stream of the three Gorges Reservoir is good, which is obviously affected by the water period and the reservoir impoundment operation, but gradually weakens. Affected by the change of water flow condition caused by impoundment, upstream water coming, tributaries confluence and non-point pollution along the course, the variation trend of water quality of each section along the main stream is not completely consistent, except for Qingxi Chang and Tuokou section, The proportion of water quality evaluation from the tail of reservoir to the head of reservoir is better than that of class 鈪，

本文編號：1862695