本文關(guān)鍵詞：水利工程對(duì)南四湖現(xiàn)代沉積速率的影響，，由筆耕文化傳播整理發(fā)布。

水利工程對(duì)南四湖現(xiàn)代沉積速率的影響

Effects of Hydraulic Engineering Applications on Recent Sedimentation Rates in Nansi Lake

[1] [2] [3] [4] [5]

D1NG Zhaoyun, YANG Hao , XIE Biao , ZHANG Mingli , WANG Xiaolei（ 1. School of Geographical Science, Nanjing Normal University, Nanjing 210046, China ;2. School of Tourism,

[1]南京師范大學(xué)地理科學(xué)學(xué)院,江蘇南京210046; [2]棗莊學(xué)院旅游與資源環(huán)境學(xué)院,山東棗莊277160; [3]南京曉莊學(xué)院生物化工與環(huán)境工程學(xué)院,江蘇南京211171

文章摘要：利用放射性同位素（^137Cs、^210Pb）測(cè)年法計(jì)算山東省南四湖的沉積速率,采用高純鍺γ譜儀（美國(guó)EG＆G ORTEC公司）對(duì)南四湖上級(jí)湖、下級(jí)湖的沉積巖柱（DS2和WS2）樣品進(jìn)行^137Cs、^210Pb放射性活度測(cè)試,分析水利工程建設(shè)對(duì)湖泊沉積影響的程度與后果.結(jié)果表明：上級(jí)湖、下級(jí)湖^137Cs總蓄積量之比為9.7,說(shuō)明在二級(jí)壩水利工程影響下,流域內(nèi)侵蝕泥沙及其所吸附的^137Cs主要沉積于上級(jí)湖;^137Cs在湖泊沉積物中的剖面分布與^137Cs大氣沉降時(shí)序的分布模式相背離,故^137Cs蓄積峰不具備時(shí)標(biāo)意義.利用^210Pb計(jì)年的CRS（恒定補(bǔ)給速率）模式分析2個(gè)沉積巖柱不同質(zhì)量深度所對(duì)應(yīng)的年代,結(jié)果顯示,150多年來(lái)南四湖上級(jí)湖、下級(jí)湖的沉積速率不穩(wěn)定,以1960年為界劃分為兩大時(shí)段：沉積巖柱底部所對(duì)應(yīng)的年代至1960年,上級(jí)湖、下級(jí)湖沉積速率平均值分別為0.069、0.160 g/（cm^2·a）;1960—2010年,二者沉積速率平均值分別為0.218、0.072 g/（cm^2·a）.可見,二級(jí)壩水利工程對(duì)南四湖沉積速率產(chǎn)生了重要影響,^210Pb計(jì)年的CRS模式分析結(jié)果可靠.

Abstr：Fallout radionuclides^137 Cs and^210Pb tracer techniques were used to measure recent sedimentation rates in Nansi Lake,Shandong Province.The effects of hydraulic engineering applications on the lake sedimentation patterns were analyzed to provide more information to guide sustainable development of Nansi Lake.The^137 Cs and^210Pb dating of two sedimentation cores（DS2 and WS2）,picked respectively from the Higher Lake and the Lower Lake of Nansi Lake,indicated that the ratio of accumulation of^137 Cs between DS2 and WS2 was about 9.7.Affected by Grade Ⅱ dam application,^137 Cs inventory and erosion losses of DS2 were much greater than that those of WS2.Vertical profiles of^137 Cs in the lake sediment were different,with patterned distribution based on atmospheric deposition sequences.Besides^137 Cs natural decay,post-depositional redistribution and water turbulence,the main possible reason was the catchment derived^137 Cs input.The peak of^137 Cs accumulation had no significance on time mark.The times based on sample mass-depth of the two cores calculated by210 Pb constant rate of supply（CRS） model indicated that the sedimentation rates of the Higher Lake and the Lower Lake were not stable over the past 150 years.Using the completion of the Grade Ⅱ dam（1960） as a time marker,it was estimated that the mean sedimentation rates for the Higher Lake and the Lower Lake were 0.069 and 0.160 g/（cm^2·a） before1960,and 0.218 and 0.072 g/（cm^2·a） from 1960 to 2010,respectively.The results showed that the application of the GradeⅡ dam significantly affected the sedimentation rates in Nansi Lake.The dates derived from^210 Pb CRS model were reliable.Further study should focus on the pollutant and nutrient transformation processes using2

文章關(guān)鍵詞：

Keyword：:hydraulic engineering recent sedimentation rate ^137Cs and ^210Pb dating Nansi Lake

課題項(xiàng)目：國(guó)家自然科學(xué)基金重點(diǎn)項(xiàng)目（41030751）;國(guó)家自然科學(xué)基金面上項(xiàng)目（41173094）; 江蘇高校優(yōu)勢(shì)學(xué)科建設(shè)工程資助項(xiàng)目,致謝：審稿專家及責(zé)任編輯給出了合理的修改建議;楊本俊博士.陸健等參與了野外采樣;陳勁松、蘇曉燕、崔文靜、王琳賢、莊艷、田琳琳等碩士研究生參與了樣品的制備與測(cè)試;南四湖水利管理局李振生提供了部分資料.在此表示感謝!

作者信息：會(huì)員可見

  本文關(guān)鍵詞：水利工程對(duì)南四湖現(xiàn)代沉積速率的影響，由筆耕文化傳播整理發(fā)布。