【摘要】：主要研究了2種沉積物粒徑(35μm和130μm)及底床微地形對(duì)沉積物中內(nèi)源溶解性有機(jī)磷釋放的影響。選取某淺水湖泊沉積物為研究對(duì)象,對(duì)其人工污染溶解性有機(jī)磷R(shí)%用室內(nèi)循環(huán)直流水槽頂蓋驅(qū)動(dòng)流模擬風(fēng)生流,考察靜態(tài)和風(fēng)生流作用下不同粒徑沉積物及底床微地形對(duì)溶解性有機(jī)磷釋放的影響。實(shí)驗(yàn)結(jié)果表明:在20 cm·s~(-1)及38 cm·s~(-1)2種驅(qū)動(dòng)流速條件下35μm粒徑沉積物實(shí)驗(yàn)組中沉積物有機(jī)磷釋放速率均大于130μm實(shí)驗(yàn)組。對(duì)于35μm粒徑沉積物實(shí)驗(yàn)組在20 cm·s~(-1)驅(qū)動(dòng)水流擾動(dòng)下,沉積物有機(jī)磷的平衡釋放量為0.44 mg·L~(-1),在38 cm·s~(-1)驅(qū)動(dòng)水流擾動(dòng)下為0.49 mg·L~(-1);對(duì)于130μm粒徑沉積物實(shí)驗(yàn)組在20 cm·s~(-1),和38 cm·s~(-1)2種擾動(dòng)下的沉積物有機(jī)磷平衡釋放量分R%為0.29 mg·L~(-1)、0.30 mg·L~(-1);驅(qū)動(dòng)流速的提高促使達(dá)到平衡狀態(tài)時(shí)的釋放量提高小粒徑沉積物提高驅(qū)動(dòng)流速更利于平衡釋放量的提高且高驅(qū)動(dòng)流速縮短達(dá)到釋放平衡所需的時(shí)間。在底床微地形(對(duì)地形的描述采用:y=O.1sin2πx)實(shí)驗(yàn)中發(fā)現(xiàn),靜態(tài)條件下波峰處上覆水有機(jī)磷濃度首先逐漸降低至0.18 mg·L~(-1),其后升高至0.40 mg·L~(-1)并達(dá)到平衡而波谷處則不斷上升至極大值0.87 mg·L~(-1)其后下降至0.77 mg·L~(-1)并達(dá)到平衡;而在20 cm·s~(-1)的驅(qū)動(dòng)水流擾動(dòng)下,波峰波谷處上覆水有機(jī)磷濃度變化較為_致均逐漸增長(zhǎng)至極大值0.39 mg·L~(-1)和0.45 mg·L~(-1)后達(dá)到平衡狀態(tài)。此外,在靜態(tài)和動(dòng)態(tài)條件下,波谷處上覆水中有機(jī)磷含量始終高于波峰處。
[Abstract]:The effects of two sediment diameters (35 渭 m and 130 渭 m) and the microtopography of the bottom bed on the release of endogenous dissolved organic phosphorus from sediments were studied. In this paper, a shallow lake sediment was selected as the research object, and its artificially polluted dissolved organic phosphorus (R%) was simulated by the roof driving flow of indoor circulating direct current flume. The effects of sediment size and microtopography on the release of dissolved organic phosphorus under static and wind-induced flow were investigated. The results showed that the release rate of organic phosphorus in the sediment of 35 渭 m sediment was higher than that in the experimental group at 20 cm s ~ (-1) and 38 cm s ~ (-1). For the experimental group with 35 渭 m diameter sediment, the equilibrium release of organic phosphorus was 0.44 mg L ~ (-1) under 20 cm s ~ (-1) driven flow disturbance. Under 38 cm s ~ (-1) driven flow disturbance, it is 0.49 mg L ~ (-1); For the 130m diameter sediment experiment group, the organic phosphorus equilibrium release of the sediment under 20 cm s ~ (-1) and 38 cm s ~ (-1) disturbance was 0.29 mg L ~ (-1), 0.30 mg L ~ (-1); The higher the driving velocity, the higher the release at equilibrium state. The higher the driving velocity of sediment is, the better the release rate is, and the shorter the time to reach the release equilibrium is. In the experiment of bottom bed microtopography (y=O.1sin2 蟺 x), it was found that the concentration of organic phosphorus at the top of the wave peak decreased gradually to 0.18 mg L ~ (-1) under static condition. Then it increased to 0.40 mg L ~ (-1) and reached equilibrium, while the trough continued to rise to a maximum of 0.87 mg L ~ (-1) and then decreased to 0.77 mg L ~ (-1) and reached equilibrium. However, under the driving water disturbance of 20 cm s ~ (-1), the concentration of organic phosphorus in the overlying water increases to the maximum of 0.39 mg L ~ (-1) and 0.45 mg L ~ (-1), and reaches equilibrium state after the change of the concentration of organic phosphorus in the overlying water at the peak and trough of the wave gradually increases to a maximum of 0.39 mg L ~ (-1) and 0.45 mg L ~ (-1). In addition, under static and dynamic conditions, the content of organic phosphorus in the overlying water at the trough is always higher than that at the peak.
【作者單位】： 長(zhǎng)沙理工大學(xué)水沙科學(xué)與水災(zāi)害防治湖南省重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(51309032,51408068,51479215,51308069)
【分類號(hào)】：X524

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