Field observations of stratification in stormwater wet ponds

Ahmed, Sherif Sayed; Loewen, Mark; Zhang, Wenming; Ghobrial, Tadros; Zhu, David Z.; Mahmood, Khizar; Duin, Bert van

doi:10.1016/j.jenvman.2022.115988

Cited by 6 publications

(6 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…S7 †) further shows that the water column periodically straties, which would restrict the downward diffusion of dissolved oxygen into the bottom water. As observed for other SWPs, 71,72 this likely leads to oxygen-free waters overlying the sediments.…”

Section: Internal P Loadingsupporting

confidence: 54%

Mineral formation explains the high retention efficiency of dissolved reactive phosphorus in a residential stormwater pond

Shafii,

Slowinski,

Sabur

et al. 2024

Environ. Sci.: Adv.

View full text Add to dashboard Cite

show abstract

Section: Internal P Loadingsupporting

confidence: 54%

Mineral formation explains the high retention efficiency of dissolved reactive phosphorus in a residential stormwater pond

Shafii,

Slowinski,

Sabur

et al. 2024

Environ. Sci.: Adv.

View full text Add to dashboard Cite

show abstract

“…Consequently, the inlet jet is distributed over the whole flow depth and is not concentrated on just a fraction of the flow depth. This differs from real-world stormwater ponds in which pressurized pipes are used as inlets and outlets (with their inverts typically close to pond bed) leading to a concentrated inlet jet near the bottom [56]. Second, thermal, chemical and densimetric stratifications are reported in the field, with variations in fluid density, temperature, and salt concentration over relatively long periods of time (days, seasons, years) [56,57].…”

Section: Possible Role Of Stratificationmentioning

confidence: 93%

“…This differs from real-world stormwater ponds in which pressurized pipes are used as inlets and outlets (with their inverts typically close to pond bed) leading to a concentrated inlet jet near the bottom [56]. Second, thermal, chemical and densimetric stratifications are reported in the field, with variations in fluid density, temperature, and salt concentration over relatively long periods of time (days, seasons, years) [56,57]. This contrasts with the experimental reservoirs studied here, which were fed with water only, at a constant temperature, and for durations not exceeding about an hour.…”

Section: Possible Role Of Stratificationmentioning

confidence: 98%

“…Throughout this study, stratification was neglected in our 2D depth-averaged modelling framework, and the water column was assumed to be vertically well mixed. In real-world shallow stormwater ponds, stratification was observed to be important in some circumstances [56,57]. Depth-averaged modelling might hence be viewed as a limitation.…”

Section: Possible Role Of Stratificationmentioning

confidence: 99%

See 1 more Smart Citation

What does the volume-averaged water age distribution function reveal about flow fields in rectangular shallow reservoirs?

Dewals,

Archambeau,

Erpicum

et al. 2024

Environ Fluid Mech

View full text Add to dashboard Cite

Shallow reservoirs are hydraulic structures widely used for water storage or as sedimentation tanks. Their design and sizing are intricate due to the complex flow fields developing in such structures, hence suitable indicators are needed to evaluate their hydraulic performance. Based on the outcomes of a depth-averaged computational model, we analysed the potential of the distribution function of the volume-averaged water age to unveil in a concise way valuable information on the flow field in rectangular shallow reservoirs. Ten different reservoir layouts were examined. In all cases, the shape of the computed distribution function reveals a remarkable amount of information on the flow field in the reservoirs. The distribution functions exhibit a sequence of steps, followed by an exponential decay, which may be related to fast and slow pathways travelled by water particles along their routes across the reservoirs. As such, the distribution function of the volume-averaged water age was found to provide valuable information for assessing the hydraulic performance of shallow reservoirs, while achieving an effective reduction in the problem dimensionality.

show abstract

“…Because lake mixing frequency has been shown to control the vertical distribution of As in shallow lakes on a seasonal timescale (Fung et al., 2022), it is possible that diel convective mixing may also affect As concentrations on shorter timescales. Additionally, instabilities and breaking of internal waves have been shown to cause horizontal and vertical fluxes of solutes in shallow lakes (Ahmed et al., 2022; MacIntyre et al., 2009).…”

Section: Introductionmentioning

confidence: 99%

Short‐Term Arsenic Cycling in a Shallow, Polymictic Lake

Fung,

Hull,

Gawel

et al. 2024

Water Resources Research

View full text Add to dashboard Cite

Arsenic (As), a harmful contaminant present in many urban lakes, can negatively impact lake ecosystem health when aqueous concentrations are elevated. We observed repeated diel oscillations in As concentrations in the bottom waters of a shallow, temperate lake during a weeklong period. In this work, we explore four mechanistic hypotheses to explain the diel As cycles based on the physical and biogeochemical processes that were investigated during the study. Despite pH being known to control diel As cycles in rivers, we determined that this mechanism was inconsistent with As dynamics observed in Lake Killarney. Instead, we found that iron and manganese concentrations oscillated simultaneously with As concentrations and that redox conditions adjacent to the lakebed likely controlled the near‐bed availability of these three elements. However, based on timescale analysis, we determined that biogeochemical processes at the sediment water interface alone could not have led to the daily oscillations in bottom water concentrations. Rather, turbulence from convective mixing was necessary to transport dissolved species. Notably, we saw that the timing and intensity of peaks in convectively driven turbulence were consistent with observed diel fluctuations in bottom water As. Our results indicate that physical mixing is key in controlling As transport and concentrations on diel timescales within shallow lakes. Understanding the daily cycling of As in shallow lakes is essential for predicting the degree to which lake biota are exposed to this contaminant. Diel oscillations in As concentrations should be considered when designing sampling methods to assess the water quality of contaminated sites.

show abstract

Field observations of stratification in stormwater wet ponds

Cited by 6 publications

References 29 publications

Mineral formation explains the high retention efficiency of dissolved reactive phosphorus in a residential stormwater pond

Mineral formation explains the high retention efficiency of dissolved reactive phosphorus in a residential stormwater pond

What does the volume-averaged water age distribution function reveal about flow fields in rectangular shallow reservoirs?

Short‐Term Arsenic Cycling in a Shallow, Polymictic Lake

Contact Info

Product

Resources

About