EcoShape Releases the Koehoal Salt Marsh Development Study

first_imgThe EcoShape foundation which carries out the public-private Building with Nature innovation program recently released a study on the Mud Motor Koehoal salt marsh development.The Koehoal Salt Marsh Development with a Mud Motor looks at the potential for furthering the development of salt marshes in the Wadden Sea by making optimal use of the sediment transportation capacity of ambient flows.Approximately 1.3 million m³ of mainly fine sediment is dredged annually from the harbor basins in the Port of Harlingen to maintain navigability. The dredged sediment is deposited in a designated area in the Wadden Sea near the harbor. A lot of the dredged sediment flows back into the port relatively quickly.ApproachThe Building with Nature study Ports of the Wadden Sea suggested an innovative approach to sediment management: deposit the dredged sediment further north of Harlingen and let natural processes spread the sediment to nearby salt marshes.An underlying hypothesis in the Mud Motor concept is that, when the mud dredged from, for example, a nearby channel or port is picked up by a tidal current, that current will achieve its maximum transport capacity. Higher mud concentrations in the currents that feed a salt marsh will probably accelerate marsh-development processes, while maintaining the desired gradients that are associated with natural salt-marsh development.ObjectiveThe Mud Motor is expected to generate three beneficial effects:less recirculation towards the harbor, and therefore less maintenance dredging;promotion of the growth and stability of salt marshes, improving the Wadden Sea ecosystem;stabilization of the foreshore of the dikes, and therefore less maintenance work on the dike.ApproachThe approach of increasing the sediment supply to further the development of salt marshes is an alternative to the traditional approach of slowing down tidal flows with semi-permeable barriers to stimulate sedimentation.Over a period of two winters (2016 and 2017), part of the sediment dredged from the Port of Harlingen (470,000 m³ in total) was deposited upstream from the Koehoal salt marsh. It is expected that this mud will be transported by the tidal currents to the study site. Preliminary calculations indicate that 10% of the mud will remain in the study area, raising the level of the marsh by 1-2 cm more by comparison with the reference growth rate which is 1-2 cm.ResearchThe formulae for combined wave-current shear stress and mud re-suspension will be analysed in order to identify and predict the fate of the deposited mud in the context of the biological effects involved in initial salt-marsh development. The transport of fines in various tidal conditions and horizontal salinity gradients at transects near the Mud Motor will therefore also be investigated.The natural boundary conditions for salt-marsh vegetation and macrozoobenthos relating to sedimentation events are being investigated to support the design of a Mud Motor. Both the intertidal area (where the sediment will be temporarily stored) and the salt marsh receive the right amount of sediment to optimize functioning. This will make it possible to quantify the total benefit of a Mud Motor for ecosystem services.Alongside this pilot project the STW research project ‘Sediment for salt marshes: physical and ecological aspects of a Mud Motor’ will further investigate processes relating to the use of a Mud Motor. The aim is to develop the fundamental knowledge needed to understand and quantify the physical and ecological aspects of large-scale mud nourishment operations of this kind for further upscaling and exporting.ResultsDredged fine sediments are currently considered unsuitable for re-use. However, sediments, including fine sediments, are a valuable resource, and even more so given sea level rise and sediment starvation due to activities such as reservoir construction and other river engineering works. Authorities worldwide are therefore on the alert for initiatives involving the beneficial use of dredged material.The Mud Motor is an innovative method for beneficial use of dredged sediment in which salt-marsh development is furthered by natural processes, making it a genuine Building with Nature approach. The potential economic and ecological benefits are that the introduction of a Mud Motor will reduce the necessity for dredging, while at the same time creating and extending salt marshes that are valuable from the point of view of both ecology and coastal protection.[mappress mapid=”24977″]last_img read more

Pat Fahy thrilled with Morning Assembly comeback run

first_img “I’ve never bullied him to get to this stage. We have eased him back to get where we are, and he has a number of options now including at Haydock over an extra mile, and the Bobbyjo back here. “Davy (Russell) liked him, and he should improve from that. However, the ground is the key and it probably won’t last like that for much longer.” Pat Fahy expects Morning Assembly to make plenty of progress after finishing a narrow second on his return from a long lay-off at Fairyhouse on Saturday. Having his first run since April 2014, Morning Assembly was beaten just a head in a rated chase, leaving Fahy to consider the next target for his Grade One-placed chaser. Fahy said: “I’m extremely happy with that. I felt coming here if he was involved over the last few fences I’d be happy, but to battle back the way he did was great. center_img Press Associationlast_img read more

Women’s Soccer Falls At Indiana State, 3-2

first_img“Our players are far better than this result,” said head coach Lindsey Horner. “To be up two goals with 20 minutes left and lose is disappointing, but to lose composure is the part that we have to correct. We have to be solid for ninety minutes to get points in the league and at the moment we are the supposed team to beat so we are seeing the best version of every team. I am confident in our players and trust that we will rebound from this.” Kansas State 10/2/2016 – 1 PM Next Game: Live Stats HTML Box Score Salisbury scored her first goal of the season off a corner kick by junior Kasey Hurt (Ankeny, Iowa) in the 20th minute (20:40). PDF Box Score Indiana State (6-7, 1-1 MVC) rallied with three goals in the final 20:32 of play. The Sycamores scored the first goal (69:28) off a corner kick to Maddie Orf, the second goal (79:27) was scored by Katie Wells off a header on a cross and the final goal (82:48) came from Kayla Schrubb on a rebound shot from the top of the box. Story Linkscenter_img TERRE HAUTE, Ind. – Indiana State scored three goals in the second half to rally past the Drake University women’s soccer team, 3-2, Friday, Sept. 30 night in Missouri Valley Conference action at Memorial Stadium. Drake finished with nine shots with seven on goal, led by Hurt’s three. Hurt finished with two assists and has a team-high six. Hurt is now tied for sixth all-time in career assists in program history. Full Schedule Roster Hurt assisted Rohan’s goal as well as the team’s assists leader sent a cross that Rohan punched in for first career goal. Preview Drake (8-3-1, 0-2 MVC) built a 2-0 lead midway through the first half behind goals by Brooke Salisbury (Kearney, Mo.) and Cassie Rohan (Palatine, Ill.). Drake welcomes Kansas State Sunday to the Cownie Soccer Complex for a 1 p.m. matinee match. The Wildcats are in their first season of Division I varsity soccer. Print Friendly Versionlast_img read more